In cryptography and computer security, a length extension attack is a type of attack where an attacker can use Hash(message1) and the length of message1 to calculate Hash(message1 ‖ message2) for an attacker-controlled message2, without needing to know the content of message1. This is problematic when the hash is used as a message authentication code with construction Hash(secret ‖ message), and message and the length of secret is known, because an attacker can include extra information at the end of the message and produce a valid hash without knowing the secret. Algorithms like MD5, SHA-1 and most of SHA-2 that are based on the Merkle–Damgård construction are susceptible to this kind of attack. Truncated versions of SHA-2, including SHA-384 and SHA-512/256 are not susceptible, nor is the SHA-3 algorithm.HMAC also uses a different construction and so is not vulnerable to length extension attacks. (Wikipedia).
Timelapse of building of extension to my garage. Unfortunately I didn't think to do this until it was started...
From playlist Projects & Installations
Evaluate limits by expanding the power
Evaluate limits by expanding the power, blackpenredpen, math for fun
From playlist Sect2.3, Evaluating Limits Algebraically
What is length contraction? Length contraction gives the second piece (along with time dilation) of the puzzle that allows us to reconcile the fact that the speed of light is constant in all reference frames.
From playlist Relativity
Special Relativity C3 Length Contraction
Relativistic length contraction.
From playlist Physics - Special Relativity
Physics - Thermodynamics: Temperature (1 of 4) Thermal Linear Expansion: Definition
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain and show you how to calculate the thermal linear expansion.
From playlist MOST POPULAR VIDEOS
Introduction to Infinite Limits in Calculus 1
Introduction to Infinite Limits in Calculus 1
From playlist Calculus 1 Exam 1 Playlist
AWESOME physics experiments Ball expansion (science demonstrations)
In this video i demonstrate the effect of expansion! Enjoy.
From playlist physics
1A Introduction to this course on limits
A course on limits in calculus for healthcare and life sciences students.
From playlist Life Science Math: Limits in calculus
Pierre Liardet - Randomness and Cryptography with a dynamical point of view (Part 2)
Randomness and Cryptography with a dynamical point of view (Part 2)
From playlist École d’été 2013 - Théorie des nombres et dynamique
FIT2.3.3. Algebraic Extensions
Field Theory: We define an algebraic extension of a field F and show that successive algebraic extensions are also algebraic. This gives a useful criterion for checking algberaic elements. We finish with algebraic closures.
From playlist Abstract Algebra
GoGaRuCo 2012 - Modern Cryptography
Modern Cryptography by: John Downey Once the realm of shadowy government organizations, cryptography now permeates computing. Unfortunately, it is difficult to get correct and most developers know just enough to be harmful for their projects. Together, we’ll go through the basics of moder
From playlist gogaruco 2012
Alain Couvreur - Comment domestiquer les codes de Goppa sauvages?
Le schéma de McEliece est un schéma de chiffrement basé sur les codes correcteurs d'erreurs dont la sécurité repose sur la difficulté à décoder un code aléatoire. Parmi les différentes familles de codes algébriques proposées pour ce schéma, les codes de Goppa classiques sont les seuls à ré
From playlist Journées Codage et Cryptographie 2014
Hacking Livestream #53: The ZIP file format
Re-doing my talk from Technische Hochschule Ingolstadt Slides/etc: http://gynvael.coldwind.pl/?lang=en&id=682 http://gynvael.coldwind.pl/?id=523
From playlist Gynvael's [EN] Talks and Interviews
ShmooCon 2013: Crypto: You're Doing It Wrong
For more information and to download the video visit: http://bit.ly/shmoocon2013 Playlist ShmooCon 2013: http://bit.ly/Shmoo13 Speaker: Ron Bowes As a group. the security industry has solved a lot of difficult problems. Firewalls do a great job blocking traffic, overflow vulnerabilities
From playlist ShmooCon 2013
Seminar on Applied Geometry and Algebra (SIAM SAGA): Gretchen Matthews
Title: Multivariate Goppa Codes Speaker: Gretchen Matthews, Virginia Tech Date: Tuesday, May 10, 2022 at 11:00am Eastern Abstract: Goppa codes were introduced in 1971 by V. D. Goppa using a univariate polynomial g(x), called a generator polynomial, over a finite field. Properties of the G
From playlist Seminar on Applied Geometry and Algebra (SIAM SAGA)
Trusted CI webinar: Deployable Internet Routing Security with Amir Herzberg
Originally recorded May 20th, 2019 Slides: http://hdl.handle.net/2142/103896 Internet routing is woefully insecure - in spite of many attacks and extensive awareness and efforts. But, finally, there is progress - and even some deployable defenses, based on free open-source software - inc
From playlist Center for Applied Cybersecurity Research (CACR)
Unless you've been living under a rock for the past 30 years or so, you probably know what a fax machine is. For decades, fax machines were used worldwide as the main way of electronic document delivery. But this happened in the 1980s. Humanity has since developed far more advanced ways to
From playlist Security
DEFCON 13: DIRA: Automatic Detection, Identification, and Repair of Control-Hijacking Attacks
Speakers: Alexey Smirnov, Student, SUNY Stony Brook Tzi-cker Chiueh, Professor, SUNY, Stony Brook Buffer overflow attacks are known to be the most common type of attacks that allow attackers to hijack a remote system by sending a specially crafted packet to a vulnerable network applicat
From playlist DEFCON 13
Pre-Calculus - Applying stretching and shrinking transformations
This video will show how to apply both stretching and shrinking transformations on a function. These are applied to the square root function and the squaring function. Pay close attention to if it is an inside or outside transformation to tell if the x or y values are effected for "key"
From playlist Pre-Calculus
DEFCON 20: Uncovering SAP Vulnerabilities: Reversing and Breaking the Diag Protocol
Speaker: MARTIN GALLO SECURITY CONSULTANT, CORE SECURITY Nowadays, SAP Netweaver has become the most extensive platform for building enterprise applications and run critical business processes. In recent years it has become a hot topic in information security. However, while fixes and cou
From playlist DEFCON 20