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Videos uploaded by user “Computerphile”
How NOT to Store Passwords! - Computerphile
 
09:24
Security of users' passwords should be at the forefront of every web developer's mind. Tom takes us through the insecure ways in which some websites deal with passwords. Note: At circa 8mins, the animation does not show how the 'salt' is also stored in the database alongside the username. Hashing Algorithms and Security: http://youtu.be/b4b8ktEV4Bg Security of Data on Disk: http://youtu.be/4SSSMi4X_mA More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 1516101 Computerphile
Cross Site Request Forgery - Computerphile
 
09:20
If you don't secure your web forms, one mistaken click could be all it takes for your users to delete their own accounts. Tom Scott explains. http://www.facebook.com/computerphile https://twitter.com/computer_phile More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott Hacking Websites with SQL Injection: http://www.youtube.com/watch?v=_jKylhJtPmI Cracking Websites with Cross Site Scripting: http://www.youtube.com/watch?v=L5l9lSnNMxg This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 410843 Computerphile
Public Key Cryptography - Computerphile
 
06:20
Spies used to meet in the park to exchange code words, now things have moved on - Robert Miles explains the principle of Public/Private Key Cryptography note1: Yes, it should have been 'Obi Wan' not 'Obi One' :) note2: The string of 'garbage' text in the two examples should have been different to illustrate more clearly that there are two different systems in use. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 422309 Computerphile
Deadly Truth of General AI? - Computerphile
 
08:30
The danger of assuming general artificial intelligence will be the same as human intelligence. Rob Miles explains with a simple example: The deadly stamp collector. The Problem with JPEG: https://youtu.be/yBX8GFqt6GA Apple's $200,000 Computer: https://youtu.be/PccvZRTUhbI Rabbits, Faces & Hyperspaces: https://youtu.be/q6iqI2GIllI Thanks to Nottingham Hackspace for the location. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 709424 Computerphile
The Problem with Time & Timezones - Computerphile
 
10:13
A web app that works out how many seconds ago something happened. How hard can coding that be? Tom Scott explains how time twists and turns like a twisty-turny thing. It's not to be trifled with! A Universe of Triangles: http://www.youtube.com/watch?v=KdyvizaygyY LZ Compression in Text: http://www.youtube.com/watch?v=goOa3DGezUA Characters, Symbols and the Unicode Miracle: http://www.youtube.com/watch?v=MijmeoH9LT4 More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 1862283 Computerphile
Floating Point Numbers - Computerphile
 
09:16
Why can't floating point do money? It's a brilliant solution for speed of calculations in the computer, but how and why does moving the decimal point (well, in this case binary or radix point) help and how does it get currency so wrong? 3D Graphics Playlist: http://www.youtube.com/playlist?list=PLzH6n4zXuckrPkEUK5iMQrQyvj9Z6WCrm The Trouble with Timezones: http://youtu.be/-5wpm-gesOY More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 989015 Computerphile
Quick Sort - Computerphile
 
03:23
Quick Sort is a popular sorting algorithm, but how does it work? Alex continues our exploration of sorting algorithms with a quick look at quick sort. Original 'get sorted' film: http://youtu.be/kgBjXUE_Nwc Cookies: http://youtu.be/LHSSY8QNvew Alex's code that generated the data for the tests on the original 'get sorted' video: https://github.com/apinkney97/Sorts Alex's graph of all the results from his tests on the original 'get sorted' video: http://eprg.org/allplots.pdf http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...
Views: 207403 Computerphile
Cracking Websites with Cross Site Scripting - Computerphile
 
08:34
Audible free book: http://www.audible.com/computerphile JavaScript is dangerous! Why? How are websites vulnerable to it? Find out about bug-bounties from Tom Scott. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 887978 Computerphile
Internationalis(z)ing Code - Computerphile
 
08:18
Audible free book: http://www.audible.com/computerphile Catering for a global audience is difficult, Tom takes us through a 'timezones' style explanation of the things you need to keep in mind when internationalising your code. This video features Tom Scott - more from him at: http://www.youtube.com/enyay & https://twitter.com/tomscott The Problem with Time & Timezones: http://youtu.be/-5wpm-gesOY Emoji & the Levitating Businessman: http://youtu.be/tITwM5GDIAI Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ Floating Point: http://youtu.be/PZRI1IfStY0 Public Key Cryptography: http://youtu.be/GSIDS_lvRv4 http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 559184 Computerphile
Turing Complete - Computerphile
 
06:26
What does it mean for something to be Turing Complete? Professor Brailsford explains. Turing Machine Primer: https://youtu.be/DILF8usqp7M Turing Machines Explained: https://youtu.be/dNRDvLACg5Q Chomsky Hierarchy: https://youtu.be/224plb3bCog What on Earth is Recursion?: https://youtu.be/Mv9NEXX1VHc http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 127829 Computerphile
The Attack That Could Disrupt The Whole Internet - Computerphile
 
09:50
Audible free book: http://www.audible.com/computerphile DoS or Denial of Service Attacks are one thing, but Amplified Denial of Service Attacks could threaten the internet itself. Tom Scott explains what they are. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 999723 Computerphile
Hashing Algorithms and Security - Computerphile
 
08:12
Audible free book: http://www.audible.com/computerphile Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/ Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 755093 Computerphile
Securing Stream Ciphers (HMAC) - Computerphile
 
09:24
Bit flipping a stream cipher could help you hit the Jackpot! But not with HMAC. Dr Mike Pound explains. Correction : "pseudo" is spelled incorrectly on the graphic. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 109471 Computerphile
Follow the Cookie Trail - Computerphile
 
08:31
Cookies are controversial and new laws governing them have been introduced in Europe. Extra footage: http://youtu.be/_d0G6FZ_kR4 Featuring Tom Rodden from the University of Nottingham's Department of Computer Science. http://bit.ly/nottscomputer Follow Computerphile... http://www.facebook.com/computerphile https://twitter.com/computer_phile Video by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html
Views: 204926 Computerphile
What on Earth is Recursion? - Computerphile
 
09:40
Audible Free Book: http://www.audible.com/computerphile Recursion; like something from the film "Inception". Even Professor Brailsford says it can be hard to get your head around - watch him make it much easier to understand... EXTRA BITS: http://youtu.be/0pncNKHj-Sc Opening up the Original Mac: http://youtu.be/wFJrHuSXnZM http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 394377 Computerphile
End to End Encryption (E2EE) - Computerphile
 
08:12
End to end encryption, government ministers are again talking about stopping it. What is it and why might that be a bad idea? Dr Mike Pound explains. Hololens: https://youtu.be/gp8UiYOw8Fc Blockchain: https://youtu.be/qcuc3rgwZAE http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 269851 Computerphile
Dijkstra's Algorithm - Computerphile
 
10:43
Dijkstra's Algorithm finds the shortest path between two points. Dr Mike Pound explains how it works. How Sat Nav Works: https://youtu.be/EUrU1y5is3Y Slow Loris Attack: https://youtu.be/XiFkyR35v2Y http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 494861 Computerphile
Web vs Internet (Deep Dark Web Pt1) - Computerphile
 
05:56
To explain the deep web and the dark web, first we lay out the basic difference between The Internet and the World Wide Web. Dr Max Wilson explains Rob Miles on Game Playing AI: https://youtu.be/5oXyibEgJr0 Secure Web Browsing: https://www.youtube.com/watch?v=E_wX40fQwEA Deep Learning: https://youtu.be/l42lr8AlrHk Secrets of the Deep Dark Web: https://youtu.be/joxQ_XbsPVw http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 224407 Computerphile
Turing & The Halting Problem - Computerphile
 
06:14
Alan Turing almost accidentally created the blueprint for the modern day digital computer. Here Mark Jago takes us through The Halting Problem. Turing Machines Explained: https://youtu.be/dNRDvLACg5Q Busy Beaver: https://youtu.be/CE8UhcyJS0I VR Simulator: http://youtu.be/Lm0lA0enPSk What on Earth is Recursion?: http://youtu.be/Mv9NEXX1VHc Thanks to Assistant Professor Mark Jago of the University of Nottingham. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 502783 Computerphile
Buffer Overflow Attack - Computerphile
 
17:30
Making yourself the all-powerful "Root" super-user on a computer using a buffer overflow attack. Assistant Professor Dr Mike Pound details how it's done. The Stack: https://youtu.be/7ha78yWRDlE Botnets: https://youtu.be/UVFmC178_Vs The Golden Key: iPhone Encryption: https://youtu.be/6RNKtwAGvqc 3D Stereo Vision: https://youtu.be/O7B2vCsTpC0 Brain Scanner: https://youtu.be/TQ0sL1ZGnQ4 http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 721930 Computerphile
Compression - Computerphile
 
07:38
Most of us deal with data compression on a daily basis, but what is it and how does it work? Professor David Brailsford introduces compression with regards to text and pictures. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. (some questions from Brady, in case you are confused!) Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...
Views: 317384 Computerphile
Why do CPUs Need Caches? - Computerphile
 
06:06
We've all heard of web browser caches, but why does a super fast modern CPU need a cache? Because it's too fast. Dr Steve "Heartbleed" Bagley explains. Professor Steve Furber on Building the BBC Micro: https://youtu.be/y4WG549i3YY How Computer Memory Works: https://youtu.be/XETZoRYdtkw Why Asimov's Laws Don't Work: https://youtu.be/7PKx3kS7f4A The Problem with JPEG: https://youtu.be/yBX8GFqt6GA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 235581 Computerphile
Onion Routing - Computerphile
 
14:19
What goes on TOR stays on TOR, or so we hope. Dr Mike Pound takes us through how Onion Routing works. EXTRA BITS: https://youtu.be/6eWkdyRNfqY End to End Encryption: https://youtu.be/jkV1KEJGKRA Deep Web / Dark Web: https://youtu.be/joxQ_XbsPVw http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 495086 Computerphile
Could We Ban Encryption? - Computerphile
 
06:41
10% off at Squarespace: http://squarespace.com/computerphile Secret services want to read people's communications, politicians talk about terrorists, but what's the reality of banning encryption? Ross Anderson, Professor of Security Engineering at the Computer Laboratory, University of Cambridge explains how history repeats itself. The Dress: https://youtu.be/Tw0PlGpaqy4 The VR Cave: https://youtu.be/STMcWUtQr1Y Public Key Cryptography: https://youtu.be/GSIDS_lvRv4 Alan Turing and Enigma: http://www.youtube.com/playlist?list=PLzH6n4zXuckodsatCTEuxaygCHizMS0_I http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 159634 Computerphile
Secret Key Exchange (Diffie-Hellman) - Computerphile
 
08:40
How do we exchange a secret key in the clear? Spoiler: We don't - Dr Mike Pound shows us exactly what happens. Mathematics bit: https://youtu.be/Yjrfm_oRO0w Computing Limit: https://youtu.be/jv2H9fp9dT8 https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 206615 Computerphile
The Problem with JPEG - Computerphile
 
05:37
Never use JPEG with text. But why? Image Analyst Mike Pound explains what goes wrong when JPEG tries to compress text. Holy Grail of AI: https://youtu.be/tlS5Y2vm02c Computer That Changed Everything: https://youtu.be/6LYRgrqJgDc Arduino Hardware: https://youtu.be/b4z1zkmo1BE How JPEG Works: https://www.youtube.com/playlist?list=PLzH6n4zXuckoAod3z31QEST1ZaizBuNHh http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 367843 Computerphile
Elliptic Curves - Computerphile
 
08:42
Just what are elliptic curves and why use a graph shape in cryptography? Dr Mike Pound explains. Mike's myriad Diffie-Hellman videos: https://www.youtube.com/playlist?list=PLzH6n4zXuckpoaxDKOOV26yhgoY2S-xYg https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 163087 Computerphile
How Blurs & Filters Work - Computerphile
 
07:52
Image filters make most people think of Instagram or Camera Phone apps, but what's really going on at pixel level? Image Analyst Dr Mike Pound explains some of the most common filters. Secrets Hidden in Images (Steganography): https://youtu.be/TWEXCYQKyDc JPEG 'files' & Colour: https://youtu.be/n_uNPbdenRs The Dress: https://youtu.be/Tw0PlGpaqy4 The VR Cave: https://youtu.be/STMcWUtQr1Y JPEG Discrete Cosine Transform (DCT): https://youtu.be/Q2aEzeMDHMA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 312504 Computerphile
Space Carving - Computerphile
 
14:47
Removing voxels until the shape emerges. Space Carving is a kind of virtual sculpture. Image Analyst Dr Mike Pound explains how though it's a bit rough and ready, it can be lightning fast. Rob Miles on Game Playing AI: https://youtu.be/5oXyibEgJr0 Deep Learning: https://youtu.be/l42lr8AlrHk Secure Web Browsing: https://www.youtube.com/watch?v=E_wX40fQwEA Thanks to Rick van de Zedde, Wageningen UR for kind permission to use their Tomato Seedlings footage. 3D Stereo Vision: https://youtu.be/O7B2vCsTpC0 Deep Learning: https://youtu.be/l42lr8AlrHk ISP Advert Injection / Secure Web Browsing: https://youtu.be/E_wX40fQwEA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 151176 Computerphile
Characters, Symbols and the Unicode Miracle - Computerphile
 
09:37
Audible free book: http://www.audible.com/computerphile Representing symbols, characters and letters that are used worldwide is no mean feat, but unicode managed it - how? Tom Scott explains how the web has settled on a standard. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott EXTRA BITS: http://youtu.be/qBex3IDaUbU Data Security: http://youtu.be/4SSSMi4X_mA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 773681 Computerphile
Where GREP Came From - Computerphile
 
10:07
Commonly used grep was written overnight, but why and how did it get its name? Professor Brian Kernighan explains. EXTRA BITS: https://youtu.be/bSaBe6WiC2s Inside an ALT Coin Mining Operation: COMING SOON Unix Pipeline: https://youtu.be/bKzonnwoR2I https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 249764 Computerphile
Capturing Digital Images (The Bayer Filter) - Computerphile
 
06:06
How do digital cameras turn light into the data that computers can handle? In this second part of our computer vision series, Image Analyst Mike Pound explains the Bayer Filter. Professor Steve Furber on the BBC Micro: https://youtu.be/y4WG549i3YY 2D Images: http://youtu.be/06OHflWNCOE Universe of Triangles: http://youtu.be/KdyvizaygyY?list=PLzH6n4zXuckrPkEUK5iMQrQyvj9Z6WCrm Pushing the Atari Limits: http://youtu.be/3OdtfsXOkEY http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 118867 Computerphile
Magic "Nothing Up My Sleeve" Numbers - Computerphile
 
05:32
How are encryption standards constants chosen? Dr Mike Pound explains these not-so-magic numbers. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 115721 Computerphile
The Golden Key: FBI vs Apple iPhone - Computerphile
 
08:00
Should Apple unlock a terrorists iPhone for the FBI? Professor Ross Anderson explains how this is a "Pandora's Box" situation. Buffer Overflow Attacks: https://youtu.be/1S0aBV-Waeo $5 Computer: https://youtu.be/WR0ghM3U0M4 AI Safety: https://youtu.be/IB1OvoCNnWY EXTRA BITS: https://youtu.be/6iGxNku7ilw http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 272329 Computerphile
JPEG 'files' & Colour (JPEG Pt1)- Computerphile
 
07:18
JPEG Isn't a file format. Image Analyst Mike Pound explains why not in our first in a series about how JPEG works. Colourspaces: https://youtu.be/LFXN9PiOGtY Elegant Compression (The LZ Method): https://youtu.be/goOa3DGezUA Capturing Digital Images (The Bayer Filter): https://youtu.be/LWxu4rkZBLw Discrete Cosine Transform: https://youtu.be/Q2aEzeMDHMA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 212881 Computerphile
Mac or PC? - Computerphile
 
05:48
Over Computerphile's first year, we asked each contributor the question: "Mac or PC?" as part of our sound-check. Here are the answers... nb - we know that PC is defined as Personal Computer, and that to be pedantic, a Mac 'is' a PC, but in general, 'PC' is the way people refer to a machine running Linux or Windows. Differences between Macs and PCs: http://youtu.be/SZXY5990xZs How NOT to Store Passwords!: http://youtu.be/8ZtInClXe1Q Elegant Compression in Text (LZ): http://youtu.be/goOa3DGezUA Typesetters in the '80's: http://youtu.be/XvwNKpDUkiE Little Mac with the Big Bite: http://youtu.be/NMlbUCAOEXw In Order of Appearance: Dr Steven Bagley - University of Nottingham John Chapman - Graphics Programmer Professor Steve Benford - University of Nottingham Spencer Owen - Nottingham Hackspace Professor Derek McAuley - University of Nottingham Paula Besson - Nottingham University Hacking Society Matt Lloyd - Ciseco, Nottingham Michael Erskine - Nottingham Hackspace Dr. Taha Osman - Nottingham Trent University James Hayward - Nottingham Hackspace Professor Tom Rodden - University of Nottingham Ian Livingstone - Life President of Eidos Laurence Day - University of Nottingham Tom Scott - @tomscott Dr. Richard Mortier - University of Nottingham Professor Luciano Floridi - Professor of Philosophy and Ethics of Information, Oxford Internet Institute Alex Pinkney - University of Nottingham Joe Nash - University of Nottingham Professor David Brailsford - University of Nottingham Professor David Brown - Nottingham Trent University Dr. Thorsten Altenkirch - University of Nottingham http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 514861 Computerphile
Raspberry Pi Zero - the $5 Computer - Computerphile
 
06:30
A $5 computer - where's the catch? Well, there doesn't seem to be one. Dr Steve "Heartbleed" Bagley explains the Raspberry Pi Zero. Chip & PIN Fraud: https://youtu.be/Ks0SOn8hjG8 Steve Furber on BBC Micro: https://youtu.be/y4WG549i3YY Why Asimov's Laws of Robotics Don't Work: https://youtu.be/7PKx3kS7f4A Festive Flashing Lights: https://youtu.be/o2RFdQMi4mg http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 276066 Computerphile
Chip & PIN Fraud Explained - Computerphile
 
08:45
We rely on Chip & PIN machines to pay for things in a safe way, so how are they being compromised? Ross Anderson is Professor of Security Engineering at the Computer Laboratory, University of Cambridge. Man in the Middle Attacks: https://youtu.be/-enHfpHMBo4 AI Worst Case Scenario - Deadly Truth of AI: https://youtu.be/tcdVC4e6EV4 The Problem with JPEG: https://youtu.be/yBX8GFqt6GA http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 731399 Computerphile
EXTRA BITS - Follow the Cookie Trail - Computerphile
 
04:36
Main video is at: http://youtu.be/LHSSY8QNvew This is extra footage from Tom Rodden on tracking cookies and some of the controversy surrounding digital data. Video filmed and edited by Sean Riley. Computerphile is a project by Brady Haran. See the full list of Brady's video projects at: http://periodicvideos.blogspot.co.uk/2012/06/here-are-my-channels.html Computer Science at the University of Nottingham: http://bit.ly/nottscomputer
Views: 77463 Computerphile
Functional Programming & Haskell - Computerphile
 
09:19
Just what is functional programming? We asked a member of the team that created Haskell: John Hughes, Professor of Computer Science at Chalmers University of Technology in Gothenburg. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 293356 Computerphile
Elegant Compression in Text (The LZ 77 Method) - Computerphile
 
08:43
Text compression methods such as LZ can reduce file sizes by up to 80%. Professor Brailsford explains the nuts and bolts of how it is done. Original Compression film: http://youtu.be/Lto-ajuqW3w EXTRA BITS - Text Compression meets probabilities: http://youtu.be/cCDCfoHTsaU Cross Site Scripting with Tom Scott: http://youtu.be/L5l9lSnNMxg http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 334448 Computerphile
Diffie Hellman -the Mathematics bit- Computerphile
 
07:05
Correction : as oodles of commenters have pointed out, the clock face should go from 0 to n-1. Also, worth reminding people that Mike has simplified the notation in this video (as he mentions). Mike explains the mathematics behind one of the most important pieces of computer security. (Simplified version with colour mixing analogy linked below) Secret key Exchange (Colour Mixing) Video: https://youtu.be/NmM9HA2MQGI https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 144948 Computerphile
Getting Sorted & Big O Notation - Computerphile
 
10:59
How well sorted is your algorithm? Choosing the right method to sort numbers has a huge effect on how quickly a computer can process a task. Alex Pinkney talks about two popular sorting algorithms and how they 'scale up.' Follow up film "Quick Sort": http://youtu.be/XE4VP_8Y0BU Alex's code that generated the data for the tests: https://github.com/apinkney97/Sorts Alex's graph of all the results: http://eprg.org/allplots.pdf http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at:http://periodicvideos.blogspot.co.uk/...
Views: 171042 Computerphile
Computers Without Memory - Computerphile
 
08:52
They're called 'Finite State Automata" and occupy the centre of Chomsky's Hierarchy - Professor Brailsford explains the ultimate single purpose computer. Note: Professor Brailsford omitted the transition from the 5 state to 25 state by means of a 20p, he has amended the linked notes! Chomsky's Hierarchy: https://youtu.be/224plb3bCog $5 Computer – Raspberry Pi Zero: https://youtu.be/WR0ghM3U0M4 Why Computers Use Binary: https://youtu.be/thrx3SBEpL8 Steve Furber on ARM: https://youtu.be/1jOJl8gRPyQ CPU vs GPU: https://youtu.be/_cyVDoyI6NE Professor Brailsford's Notes: http://bit.ly/computerphile_Chomsky Professor Brailsford's t-shirt kindly supplied by Peleg Bar Sapir http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 252385 Computerphile
What's your Favourite Programming Language? (sound check Q) - Computerphile
 
07:24
For the past year, we've been asking this as a sound-check question. Here are the results! Professor Graham Hutton (Haskell) Joseph Best (BBC Basic) David CX (Java / Python) Lorraine Underwood (PHP) Rob Miles (Python) Charles Arthur (Python) Sarah Spencer (Javascript) Matt Denton (C) Matt Lloyd (C/Python/PHP) Ian Dickinson (C) Tom Sheridan (Python) Spencer Owen (Forth) Rob Morley (PHP) Professor Brian Kernighan (C/AWK/Python) Rebecca Tickle (Javascript) Dr Robert Smith (Common Lisp) Aaron Jackson (Lisp / Matlab) Professor David Brailsford (C) Kate Green (HTML LOL) Dr Steve Bagley (6502 Assembler) Dr Max Wilson (Javascript) Jason Fitzpatrick (Basic) Professor Ross Anderson (Exim / Python) Adrian Marinescu (Matlab) Matt Phillips (68000 Assembler) Dr Mike Pound (C#) Professor Phil Moriarty (LabView) https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 198029 Computerphile
Key Exchange Problems - Computerphile
 
09:18
Diffie Hellman has a flaw. Dr Mike Pound explains how a man in the middle could be a big problem, unless we factor it in... Public Key Cryptography: https://youtu.be/GSIDS_lvRv4 Elliptic Curve Cryptography: Coming Soon! https://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 119318 Computerphile
Colossus & Bletchley Park - Computerphile
 
08:42
Colossus was one of the very first electronic, special purpose, computers and it was created almost two years earlier than the better known ENIAC. We visit Bletchley Park, home of the code breakers, and TNMoC, The National Museum of Computing. Professor Brailsford shows us the Colossus replica. The Most Difficult Program to Compute?: https://youtu.be/i7sm9dzFtEI Computer that Changed Everything: https://youtu.be/6LYRgrqJgDc Turing's Enigma Problem: https://www.youtube.com/playlist?list=PLzH6n4zXuckodsatCTEuxaygCHizMS0_I JPEG DCT (Discrete Cosine Transform): https://youtu.be/Q2aEzeMDHMA 5 Hole Paper Tape: https://youtu.be/JafQYA7vV6s http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 118042 Computerphile
The Great 202 Jailbreak - Computerphile
 
19:55
Before laser-printers, high quality print-outs were the domain of typesetters, expensive and tightly controlled. In 1979 a Bell Labs team reverse engineered one in their summer vacation. Professor Brailsford has the details. EXTRA BITS - More on Printing and Typesetting History: https://www.youtube.com/watch?v=HdModNEK_1U Mainframes and the Unix Revolution: http://youtu.be/-rPPqm44xLs To find out how the 1980 Bell Labs `vacation memo' was completely rebuilt, in 2013, visit: http://www.eprg.org/papers/202paper.pdf If you want to see the `vacation memo' itself -- in its original scanned-in form and after being rebuilt -- then visit: http://www.cs.princeton.edu/~bwk/202 The memorandum gives an outline of how the `reverse engineering' of the 202 was accomplished. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 390175 Computerphile
Lambda Calculus - Computerphile
 
12:40
The basis of almost all functional programming, Professor Graham Hutton explains Lambda Calculus. http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
Views: 417629 Computerphile
Turing Machines Explained - Computerphile
 
05:25
Turing Machines are the basis of modern computing, but what actually is a Turing Machine? Assistant Professor Mark Jago explains. Turing & The Halting Problem: http://youtu.be/macM_MtS_w4 Busy Beavers: https://youtu.be/CE8UhcyJS0I Avatars & In-Flight VR: http://youtu.be/TLKqKlrQv4s The (pink) VR Simulator: http://youtu.be/Lm0lA0enPSk http://www.facebook.com/computerphile https://twitter.com/computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: http://bit.ly/nottscomputer Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels
Views: 502503 Computerphile