Computer

Why encrypted group messaging isn’t as secure as point to point. Dr Mike Pound explains this ongoing problem. Instant Messaging & the Signal Protocol: https://youtu.be/DXv1boalsDI Double Ratchet Messaging Encryption: https://youtu.be/9sO2qdTci-s Relevant paper: https://eprint.iacr.org/2017/666.pdf 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
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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
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Hitler’s High Command didn’t use Enigma, they used a faster system called Lorenz, but when Allied forces first encountered it, they had no idea what it was and code-named it ‘Tunny’ (Tuna). Professor Brailsford explains why this relates to the early days of Computer Science Next Video in this series: https://youtu.be/yxx3Bkmv3ck The Professor’s Notes: Undulator
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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
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The story of recursion continues as Professor Brailsford explains one of the most difficult programs to compute: Ackermann’s function. Professor Brailsford’s programs: http://bit.ly/1nhKtW4 Follow Up Film from the Prof in response to this film: https://www.youtube.com/watch?v=uNACwX-O5lk What on Earth is Recursion?: http://youtu.be/Mv9NEXX1VHc Fibonacci Programming: http://youtu.be/7t_pTlH9HwA Heartbleed, Running the Code: http://youtu.be/1dOCHwf8zVQ VR Series: COMING SOON! Please note,
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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 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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Whether you are a Mac-o-phile or a Mac-o-phobe it is hard to deny the impact of the original Mac. As Mac turns 30, Professor David Brailsford takes us through what the original Mac was like and how it helped people learn to love computers. EXTRA BITS: http://youtu.be/rbeYwh2CstQ How YouTube Works: http://www.youtube.com/watch?v=OqQk7kLuaK4 Note: please excuse the
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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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Can deep learning improve your gaming experience? We have no idea but we know how it works. Dr Mike Pound on Deep Learned Super Sampling EXTRA BITS: https://youtu.be/4ZkrLfEIJXI 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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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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When a Bitcoin Miner Mines, what is happening? Dr Mike Pound exposes the process.. note: at 3:39 Mike mentions a Bitcoin is mined every ten minutes when it is actually a block that is mined every ten minutes, at time of recording a successful block generates 12.5 new Bitcoins. Password Cracking: https://youtu.be/7U-RbOKanYs Onion Routing (TOR):
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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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What does a GPU do differently to a CPU and why don’t we use them for everything? First of a series from Jem Davies, VP of Technology at ARM. Floating Point Numbers: http://youtu.be/PZRI1IfStY0 Why Computers Use Binary: https://youtu.be/thrx3SBEpL8 How Bitcoin Works: https://youtu.be/JyxRH18YlpA Triangles & Pixels (Graphics Playlist): https://www.youtube.com/playlist?list=PLzH6n4zXuckrPkEUK5iMQrQyvj9Z6WCrm http://www.facebook.com/computerphile Tweets by computer_phile This video was
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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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Nearest Neighbour and BiLinear resize explained by Dr Mike Pound Fire Pong: https://youtu.be/T6EBe_5LxO8 Google Deep Dream: https://youtu.be/BsSmBPmPeYQ FPS & Digital Video: https://youtu.be/yniSnYtkrwQ 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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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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Negative Binary Numbers – you may have heard of ‘signed’ numbers, but do you know how they work? Professor Brailsford explains not just how, but why we use the systems we do. Binary Addition: http://youtu.be/WN8i5cwjkSE Most Difficult Program to Compute?: http://youtu.be/i7sm9dzFtEI Floating Point Numbers: http://youtu.be/PZRI1IfStY0 http://www.facebook.com/computerphile Tweets by computer_phile This video was filmed and edited
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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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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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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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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:
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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 Tweets by computer_phile This video was filmed and edited
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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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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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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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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):
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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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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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Audible free book: http://www.audible.com/computerphile Unicode is changing, adding tons more icons and smilies – But what’s new and why? Tom Scott takes us through the improvements… More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott Characters, Symbols & the Unicode Miracle: http://youtu.be/MijmeoH9LT4 Floating Point Numbers: http://youtu.be/PZRI1IfStY0 The VR CAVE: http://youtu.be/STMcWUtQr1Y End for Moore’s Law?: http://youtu.be/X8v1BB0UaDs http://www.facebook.com/computerphile Tweets
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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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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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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 Tweets by computer_phile This video was filmed and edited by Sean Riley. Computer
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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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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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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 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
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No internet, no networking; just a screen and a keyboard, or a pile of cards to punch holes in; mainframes were a world apart from today’s smartphones and integrated circuits. Professor Brailsford remembers the Unix revolution. To hear about the omission of Gnu and Richard Stallman: http://youtu.be/Wi326Leuemg ICL computer photographs courtesy of couperus.org ICL punch-card
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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 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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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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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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Machine Learning where you put in a fraction of the effort? What’s not to like? – Dr Michel Valstar explains Active & Cooperative Learning. 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
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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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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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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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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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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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