Error detection and correction | Hash function (non-cryptographic)
Pearson hashing is a hash function designed for fast execution on processors with 8-bit registers. Given an input consisting of any number of bytes, it produces as output a single byte that is strongly dependent on every byte of the input. Its implementation requires only a few instructions, plus a 256-byte lookup table containing a permutation of the values 0 through 255. This hash function is a CBC-MAC that uses an 8-bit substitution cipher implemented via the substitution table. An 8-bit cipher has negligible cryptographic security, so the Pearson hash function is not cryptographically strong, but it is useful for implementing hash tables or as a data integrity check code, for which purposes it offers these benefits: * It is extremely simple. * It executes quickly on resource-limited processors. * There is no simple class of inputs for which collisions (identical outputs) are especially likely. * Given a small, privileged set of inputs (e.g., reserved words for a compiler), the permutation table can be adjusted so that those inputs yield distinct hash values, producing what is called a perfect hash function. * Two input strings differing by exactly one character never collide. E.g., applying the algorithm on the strings ABC and AEC will never produce the same value. One of its drawbacks when compared with other hashing algorithms designed for 8-bit processors is the suggested 256 byte lookup table, which can be prohibitively large for a small microcontroller with a program memory size on the order of hundreds of bytes. A workaround to this is to use a simple permutation function instead of a table stored in program memory. However, using a too simple function, such as T[i] = 255-i, partly defeats the usability as a hash function as anagrams will result in the same hash value; using a too complex function, on the other hand, will affect speed negatively. Using a function rather than a table also allows extending the block size. Such functions naturally have to be bijective, like their table variants. The algorithm can be described by the following pseudocode, which computes the hash of message C using the permutation table T: algorithm pearson hashing is h := 0 for each c in C loop h := T[ h xor c ] end loop return h The hash variable (h) may be initialized differently, e.g. to the length of the data (C) modulo 256; this particular choice is used in the Python implementation example below. (Wikipedia).
Cryptographic Hash Functions: Part 1
Cryptographic Hash Functions Applications of Crypto Hash Functions Birthday Problem Secure Hash Algorithm (SHA)
From playlist Network Security
Cryptographic Hash Functions: Part 2
Cryptographic Hash Functions Applications of Crypto Hash Functions Birthday Problem Secure Hash Algorithm (SHA)
From playlist Network Security
An informal introduction to cryptography. Part of a larger series teaching programming at http://codeschool.org
From playlist Cryptography
Introductory coverage of fundamental data structures. Part of a larger series teaching programming. Visit http://codeschool.org
From playlist Data Structures
Hash Tables and Hash Functions
This computer science video describes the fundamental principles of the hash table data structure which allows for very fast insertion and retrieval of data. It covers commonly used hash algorithms for numeric and alphanumeric keys and summarises the objectives of a good hash function. Co
From playlist Data Structures
Top Hashing Techniques | Popular Hashing Techniques | Network Security | #Shorts | Simplilearn
🔥FREE Cyber Security Course: https://www.simplilearn.com/learn-cyber-security-basics-skillup?utm_campaign=TopHashingTechniquesShorts&utm_medium=ShortsDescription&utm_source=youtube In this video on the top hashing techniques, we are going to take a look at the five most secure hashing alg
From playlist #Shorts | #Simplilearn
Cascadia Ruby 2014- Cloning the Seattle Ruby Brigade
By, Miles Forrest Do you love Ruby? Do you like geeking out with other Ruby coders? Do you have a project you would love to build but might need some help making it happen? The Seattle Ruby Brigade is arguably the most successful Ruby User Group in the world. They were not only the first
From playlist Cascadia Ruby 2014
Excel Hash 2021- Cooking up a quick analysis with raw data in Excel - Irish Leaving Cert data
#Excelhash Have you ever used the EVEN function, or cut out people in Excel? Well dohhhhh neither have I. But when Oz du Soleil sent me a list of ingredients for the Excel hash challenge I had to give it a go. In this video, as my submission to Excel Hash 2021, I have used cut out people
From playlist Excel Hash 2021
This is a short video tutorial on multiplying decimals. For interactive applets, worksheets, and more videos go to http://www.mathvillage.info
From playlist All about decimals
LA Ruby Conference 2013 People who liked this talk also liked ... Building Recommendation...
Title: People who liked this talk also liked ... Building Recommendation Systems Using Ruby Presented by: Ryan Weald From Amazon, to Spotify, to thermostats, recommendation systems are everywhere. The ability to provide recommendations for your users is becoming a crucial feature for mode
From playlist Los Angeles Ruby Conf 2013
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
Network Analysis. Lecture 7. Structural Equivalence and Assortative Mixing
Structural and regular equivalence. Similarity metrics. Correlation coefficient and cosine similarity. Assortative mixing and homophily. Modularity. Assortativity coefficient. Mixing by node degree. Assortative and disassortative networks Lecture slides: http://www.leonidzhukov.net/hse/20
From playlist Structural Analysis and Visualization of Networks.
Wei Wang: "Alignment-free RNASeq Analysis"
Computational Genomics Summer Institute 2016 "Alignment-free RNASeq Analysis" Wei Wang, UCLA Institute for Pure and Applied Mathematics, UCLA July 22, 2016 For more information: http://computationalgenomics.bioinformatics.ucla.edu/
From playlist Computational Genomics Summer Institute 2016
How do I... FIND SPEARMAN'S RHO in Jamovi? (2022)
What if my correlation variables violate normality assumptions or I have ordinal level variables? What sort of analysis/statistic can I use? I have the answers and more in this next episode of learning stats with Jamovi! Jamovi stats: https://www.jamovi.org/ NOTE: My tutorials always us
From playlist Jamovi 2022 Tutorials
The Most Frivolous Lawsuits Ever
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From playlist Legal Entertainment!
The 1983 "Gimli Glider" Incident.
Captain Sully’s US Airways Flight 1549 lost its engines almost immediately after takeoff, after reaching an altitude of only 2,800 feet. In 1983, a very different flight lost power at a staggering 41,000 feet, and the pilots had no choice but to try to land the plane without engines. Che
From playlist Disasters and History
Many-Facet Rasch Measurement Using Facets Software
In this video, I demonstrate how to carry out a Many-Facet Rasch Measurement Using Facets Software. If you have not watched the previous videos on Rasch measurement, they can be found from the links below: 1. https://www.youtube.com/watch?v=FDUYm7ZhXkw&t=49s 2. https://www.youtube.com/watc
From playlist Rasch Measurement