Theory of cryptography | Symmetric-key cryptography
In cryptography, collision resistance is a property of cryptographic hash functions: a hash function H is collision-resistant if it is hard to find two inputs that hash to the same output; that is, two inputs a and b where a ≠ b but H(a) = H(b). The pigeonhole principle means that any hash function with more inputs than outputs will necessarily have such collisions; the harder they are to find, the more cryptographically secure the hash function is. The "birthday paradox" places an upper bound on collision resistance: if a hash function produces N bits of output, an attacker who computes only 2N/2 (or ) hash operations on random input is likely to find two matching outputs. If there is an easier method than this brute-force attack, it is typically considered a flaw in the hash function. Cryptographic hash functions are usually designed to be collision resistant. However, many hash functions that were once thought to be collision resistant were later broken. MD5 and SHA-1 in particular both have published techniques more efficient than brute force for finding collisions. However, some hash functions have a proof that finding collisions is at least as difficult as some hard mathematical problem (such as integer factorization or discrete logarithm). Those functions are called provably secure. (Wikipedia).
Physics 40 Resistivity and Resistance (21 of 33) # of Collision per Second = ?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what happens in a conductor when the electrons are moving through a maze of vibrating ions.
From playlist PHYSICS 40 RESISTIVITY AND RESISTANCE
Kinetic Friction and Static Friction #Physics #Shorts
#Physics #Math #Science #Engineering #NicholasGKK #Shorts
From playlist General Mechanics
Physics 4.6 Friction (1 of 14) What is Friction?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain what are friction, friction force, coefficient of friction, kinetic and static friction. Next video in this series can be found at: https://youtu.be/1EKgiYBwEi0
From playlist PHYSICS 4.6 FRICTION
Introduction to Friction | Statics
https://goo.gl/CcCUJN for more FREE video tutorials covering Engineering Mechanics (Statics & Dynamics) The objectives of this video are to discuss static and kinetic friction followed by the consideration of friction-force plot. Basically, the term friction refers to the resistance offer
From playlist SpoonFeedMe: Engineering Mechanics (Statics & Dynamics)
Friction: What is it and its types
This video explains, the nature of friction, the types of friction and how static varies from kinetic friction.I cover the coefficient of friction as well. See www.physicshigh.com for all my videos and other resources. If you like this video, please press the LIKE and SHARE with your pee
From playlist Dynamics
Physics 4.6 Friction (4 of 14) What is the Friction Force? Graphical Representation
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain and draw a graphical representation of the friction force. Next video in this series can be found at: https://youtu.be/7AAcN6UYWPs
From playlist PHYSICS 4.6 FRICTION
Understanding Rolling Resistance!
Rolling resistance is the one of most important concepts in vehicle dynamics. Let's understand it in a simple way. Be our supporter or contributor: https://www.youtube.com/channel/UCqZQJ4600a9wIfMPbYc60OQ/join instagram : https://www.instagram.com/sabinzmathew/ Twitter : https://twitter.c
From playlist Vehicle Dynamics
Physics 4.6 Friction (3 of 14) What is the Friction Force?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain and graphically show how to draw the force diagrams of the friction force. Next video in this series can be found at: https://youtu.be/6NSf90m5pHY
From playlist PHYSICS 4.6 FRICTION
Cryptographic Hash Functions (Contd...1)
Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist Computer - Cryptography and Network Security
From playlist Cryptography Lectures
Mod-01 Lec-20 Defect Structure & Mechanical Behaviour of Nanomaterials
Nanostructures and Nanomaterials: Characterization and Properties by Characterization and Properties by Dr. Kantesh Balani & Dr. Anandh Subramaniam,Department of Nanotechnology,IIT Kanpur.For more details on NPTEL visit http://nptel.ac.in.
From playlist IIT Kanpur: Nanostructures and Nanomaterials | CosmoLearning.org
Physics - E&M: Ch 40.1 Current & Resistance Understood (10 of 17) What is the Mean Free Path?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain that mean free path is the distances between collisions of electrons moving conductors. It determines whether a conductor will have a high or low resistivity or conductivity. Next video in th
From playlist THE "WHAT IS" PLAYLIST
Strong Collision Resistance - Applied Cryptography
This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
From playlist Applied Cryptography
Impulse-Momentum Change Relationship
An impulse changes an object's momentum. But what exactly is impulse? And how can it be mathematically related to momentum change in order to understand collisions? Mr. H explains the important connection between impulse and momentum and explains how to use the idea. You can find more inf
From playlist Momentum and Collisions Tutorial Series
What happens when two objects collide? License: Creative Commons BY-NC-SA More information at http://k12videos.mit.edu/terms-conditions
From playlist Physics
CERIAS Security: Recent Attacks on MD5 2/6
Clip 2/6 Speaker: John Black · University of Colorado at Boulder Cryptology is typically defined as cryptography (the construction of cryptographic algorithms) and cryptanalysis (attacks on these algorithms). Both are important, but the latter is more fun. Cryptographic hash functions
From playlist The CERIAS Security Seminars 2006
Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist Computer - Cryptography and Network Security
Cryptographic Hash Functions (Contd...2)
Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
From playlist Computer - Cryptography and Network Security
Physics - E&M: Ch 40.1 Current & Resistance Understood (6 of 17) What is Resistivity?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain that resistivity is the property of a material that causes it to oppose a current. It depends on: 1) force/energy requied to remove an electron from an atom, 2) the mean free path of the elect
From playlist THE "WHAT IS" PLAYLIST
A description of friction, the coefficient of friction and friction on an inclined plane. Also covers slides or topples criteria.
From playlist Classical Mechanics