Computer

We look at where the ubiquitous AES came from. Dr Mike Pound introduces the Rijndael algorithm. SP Networks: https://youtu.be/DLjzI5dX8jc How AES Works: https://youtu.be/O4xNJsjtN6E https://www.facebook.com/computerphile Tweets by 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
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Surely decimal numbers are easier to understand than binary? So why don’t computers use them? Professor Brailsford explains the relationships between binary, power and simplicity. EXTRA BITS: https://youtu.be/NlWuTYhF8KM Colossus & Bletchley Park: https://youtu.be/9HH-asvLAj4 Inside a Data Centre: https://youtu.be/fd3kSdu4W7c Steve Furber on ARM: https://youtu.be/1jOJl8gRPyQ Fishy Codes – Bletchley’s Other Secret: https://youtu.be/Ou_9ntYRzzw http://www.facebook.com/computerphile Tweets by computer_phile This
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Hyperspace was hijacked by science fiction, but what is a space? Robert Miles explains with the use of small red rabbits and human faces. How Broadband ADSL Works: http://youtu.be/uwtGfyna62I Busy Beaver Turing Machines: http://youtu.be/CE8UhcyJS0I Public Key Cryptography: http://youtu.be/GSIDS_lvRv4 http://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer Science at the
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Recursion can be tricky to grasp. Professor Thorsten Altenkirch uses Python to demonstrate an example taken from his latest book. More on recursion: https://www.youtube.com/playlist?list=PLzH6n4zXuckrnXQ-5AfWUdnCzZOQgft1B EXTRA BITS: https://youtu.be/c9IH8DHDI4M Thorsten & Isaac’s Python programming book: https://bit.ly/2p3r5IT https://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of Nottingham: https://bit.ly/nottscomputer
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Postscript took off like a rocket but PDF took its time, many people wondering “What’s it for?” Professor Brailsford’s experience with one such person – a US immigration officer… Unrolling the Loops (Postscript/PDF intro): https://youtu.be/guXgBe2wvEA Fire Pong in Detail: https://youtu.be/ZoZMMg1r_Oc Deep Dream: https://youtu.be/BsSmBPmPeYQ FPS & Digital Video: https://youtu.be/yniSnYtkrwQ Password Cracking: https://youtu.be/7U-RbOKanYs http://www.facebook.com/computerphile Tweets by computer_phile
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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
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We’ve all got to the edge of the wifi coverage, but the idea of coverage produces a network problem, the Hidden Node Problem. Dr Steve Bagley explains. https://www.facebook.com/computerphile Tweets by 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
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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 Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer Science at the
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Just what was it that took Facebook, Instagram & WhatsApp offline on 4th October 2021? – Dr Steve Bagley investigates! previously titled “Facebook’s Day Off” Facebook announcement on the outage: https://bit.ly/C_FB-Outage The visualisation software Steve was using was BGP play, downloaded from the RIPE website. https://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited
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Voting is centuries old, why can’t we move with the times and use our phones, tablets and computers? Tom Scott lays out why e-voting is such a bad idea. More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott http://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University of
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This Primer is to accompany the ‘Busy Beaver Turing Machines’ film which can be viewed here: http://youtu.be/CE8UhcyJS0I Professor Brailsford’s code and further reading: http://bit.ly/busybeaver Turing and the Halting Problem: http://youtu.be/macM_MtS_w4 Busy Beaver Turing Machines: http://youtu.be/CE8UhcyJS0I Domino Addition – Numberphile: http://youtu.be/lNuPy-r1GuQ Ackermann Follow Up: http://youtu.be/uNACwX-O5lk ‘Turing Machines Collection’ Playlist: http://www.youtube.com/playlist?list=PLzH6n4zXuckrEzV0CB1xXbSdsP_a7VUoK “The Most Difficult Program to Compute?”
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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
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Our eyes can spot edges with no problems, but how do computers determine what’s an edge and what’s not? Image Analyst Dr Mike Pound explains the Sobel Edge detector. How Blurs & Filters work: https://youtu.be/C_zFhWdM4ic The Problem with JPEG: https://youtu.be/yBX8GFqt6GA Secrets Hidden in Images (Steganography): https://youtu.be/TWEXCYQKyDc Man in the Middle Attacks: https://youtu.be/-enHfpHMBo4 Mike’s Code in
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Harry’s: http://www.harrys.com/ use coupon code “COMPUTERPHILE” for $5 off What’s a colourspace and why do we have different ones? It’s horses for courses as Image Analyst Mike Pound explains. Digital Images: https://www.youtube.com/playlist?list=PLzH6n4zXuckpbNdFO2WW78evpMBqgqyp8 Atari ST: Pushing the Limits: https://youtu.be/3OdtfsXOkEY Professor Steve Furber on ARM: COMING SOON! Universe of Triangles: https://www.youtube.com/playlist?list=PLzH6n4zXuckrPkEUK5iMQrQyvj9Z6WCrm http://www.facebook.com/computerphile Tweets by computer_phile This video
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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
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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
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Just what is a pipeline in the computer science sense? We asked Computer Science guru Professor Brian Kernighan Why Asimov’s Laws of Robotics Don’t Work: https://youtu.be/7PKx3kS7f4A Brian Kerninghan on Bell Labs: https://youtu.be/QFK6RG47bww Don Knuth on Email: https://youtu.be/QS8qwMna8_o Computer That Changed Everything: https://youtu.be/6LYRgrqJgDc http://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited by Sean Riley.
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Digital currency, how does it work, what’s a data miner and will Bitcoin last? We asked Professor Ross Anderson of the University of Cambridge Computer Laboratory. The Problem with BitCoin: https://youtu.be/s2XHyzPA9Zc Chip & PIN Fraud: https://youtu.be/Ks0SOn8hjG8 $5 Computer – Raspberry Pi Zero: https://youtu.be/WR0ghM3U0M4 Why Computers Use Binary: https://youtu.be/thrx3SBEpL8 Public Key Cryptography: https://youtu.be/GSIDS_lvRv4 http://www.facebook.com/computerphile Tweets by
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One of the most elegant solutions for cryptography. Dr Mike Pound explains one of his most favourite ciphers. https://www.facebook.com/computerphile Tweets by 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
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Substitution-permutation networks are the basis for almost all modern symmetric cryptography. Dr Mike Pound explains. https://www.facebook.com/computerphile Tweets by 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
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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 Tweets by computer_phile Video by Sean Riley. Computerphile is a sister project to Brady Haran’s Numberphile. See the full list of Brady’s video
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Byte ordering, or boiled egg orientation, endianness is important! Dr Steve Bagley on the computer science topic named after something from an 18th century novel…. The copy of Gulliver’s Travels used in the graphics was found at archive.org and can be viewed here: http://bit.ly/C_Gulliver The animations of the hex to binary have a classic ‘out
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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 Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer Science at
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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
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Kerberos is an authentication method – Dr Mike Pound explains how it works so neatly. EXTRA BITS: Kerberos Q&A https://youtu.be/QN4WmZXi4tg https://www.facebook.com/computerphile Tweets by 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
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The back door that may not be a back door… The suspicion about Dual_EC_DRBG – The Dual Elliptic Curve Deterministic Random Bit Generator – with Dr Mike Pound. EXTRA BITS: https://youtu.be/XEmoD06_mZ0 Nothing up my sleeve Numbers: https://youtu.be/oJWwaQm-Exs Elliptic Curves: https://youtu.be/NF1pwjL9-DE https://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer Science
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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. Formerly titled “Buffer Overflow Attack” -Aug 2021 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 Tweets by computer_phile This video was
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The basis of almost all functional programming, Professor Graham Hutton explains Lambda Calculus. http://www.facebook.com/computerphile Tweets by 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
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Connecting via SSH to a remote machine is second nature to some, but how does it work? Dr Steve Bagley. Dr Mike Pound on Hashing (mentions padding but full video on padding is planned to follow): https://youtu.be/DMtFhACPnTY https://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer Science at the University
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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 Tweets by computer_phile This video was filmed and edited by Sean Riley. Computerphile is a sister project
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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 Tweets by 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.
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How are encryption standards constants chosen? Dr Mike Pound explains these not-so-magic numbers. http://www.facebook.com/computerphile Tweets by 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
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Password1 is a terrible password, but how can I remember different secure passwords for each login? Use a password manager. Dr Mike Pound explains how they work. How to Choose a Password: https://www.youtube.com/watch?v=3NjQ9b3pgIg Password Cracking on a 4x Titan X Beast: https://youtu.be/7U-RbOKanYs Securing Stream Ciphers (HMAC): https://www.youtube.com/watch?v=wlSG3pEiQdc https://www.facebook.com/computerphile Tweets by computer_phile This video was filmed
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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 Tweets by computer_phile This video was filmed and edited by Sean Riley.
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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 Tweets by
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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 Tweets by computer_phile This
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What goes on TOR stays on TOR, or so we hope. Dr Mike Pound takes us through how Onion Routing works. This video was formerly called “Onion Routing” 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 Tweets by computer_phile This video was filmed and edited by Sean Riley.
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How do websites marry up to their IP addresses? Dr Mike Pound explains the Domain Name System – DNS. https://www.facebook.com/computerphile Tweets by 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
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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 Tweets by computer_phile This video was filmed and edited by Sean Riley. Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/ Computerphile
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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 Tweets by 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
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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 Tweets by computer_phile This video was filmed and
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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 Tweets by 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
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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 Tweets by 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
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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 Tweets by 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
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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
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