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Block cipher
In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks, with an unvarying transformation that is specified by a symmetric key. Block ciphers are important elementary components in the design of many cryptographic protocols, and are widely used to implement encryption of bulk data.
The modern design of block ciphers is based on the concept of an iterated product cipher. Product ciphers were suggested and analyzed by Claude Shannon in his seminal 1949 publication Communication Theory of Secrecy Systems as a means to effectively improve security by combining simple operations such as substitutions and permutations. Iterated product ciphers carry out encryption in multiple rounds, each of which uses a different subkey derived from the original key. One widespread implementation of such ciphers is called a Feistel network, named after Horst Feistel, and notably implemented in the DES cipher. Many other realizations of block ciphers, such as the AES, are classified as substitution-permutation networks.
This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Block_cipher
Latest News for: block cipher
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Black Ops 4 Player Discovers New Easter Egg | Game Rant
Game Rant 02 Aug 2020
Since the user is a frequent map explorer, it seemed odd that the cipher was unfamiliar. The cipher reads "Oesysh.nnrtooatdceeu ltr.e.r.d.uf.a.aidloy..reo yrogNer..?uao..ys..nw a.ot.wg..Wua," and was identified as a Scytale Cipher with a "band of 10" that was solvable after being rearranged into different letter blocks....
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Zoom to roll out fresh cyber security updates
Computer Weekly 23 Apr 2020
Zoom, the videoconferencing application that has captured the zeitgeist of 2020, has announced it will be rolling out a new version supporting advanced encryption to provide increased protection for its users ... The standard uses three block ciphers, 128, 192 and 256, referring to the bit key length used to encrypt and decrypt messages ... Curry added....
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A glossary of the VPN terminology you need to know
Computer Weekly 17 Apr 2020
Enterprises' embrace of remote work accelerated due to COVID-19, and it likely won't subside when the pandemic is a distant memory. A staple of remote work is the VPN ... Advanced Encryption Standard. AES is a block cipher -- a method of text encryption -- developed and implemented globally to secure and encrypt highly classified and sensitive data ... VPN ... ....
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Capture the Coin — Cryptography Category Solutions
Coinbase 10 Jan 2020
The security of the block cipher relies on them being random, but not secret ... A block cipher on its own is not secure for encrypting more than one message because encrypting the same message twice would result in the same ciphertext, put another way, a block cipher is deterministic....
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The Different Types of Data Encryption Explained
Cascade Business News 02 Jul 2019
AES uses what is known as a block cipher type of encryption with three versions ... As a block cipher, it has the ability to encrypt data in blocks instead of by individual bits ... 3DES (Triple DES) is the block cipher encryption successor to an older algorithm known as the Data Encryption Standard (DES)....
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Soldier `treated dying man at Army base´ following Ballymurphy shootings
This is Money 10 Jun 2019
A soldier treated a dying man at an Army base following the Ballymurphy shootings, a witness has told an inquest ... The witness, who was in 2 Para and is known by the cipher M574, said no ambulance was available to take casualties to hospital because the roads were blocked. Instead he gave first aid to a man aged 35-40 using the dressings. He said ... ....
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Soldier ‘treated dying man at Army base’ following Ballymurphy shootings
Belfast Telegraph 10 Jun 2019
A soldier treated a dying man at an Army base following the Ballymurphy shootings, a witness has told an inquest ... The witness, who was in 2 Para and is known by the cipher M574, said no ambulance was available to take casualties to hospital because the roads were blocked. Instead he gave first aid to a man aged 35-40 using the dressings. He said ... ....
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The Division 2's Wild, Complicated Puzzles Are Stumping Players
Kotaku 28 Mar 2019
When people start playing a big new video game, they usually want to tackle a lot of its challenges on their own, but it’s unlikely that many Division 2 players are interested in scouring its hundreds of city blocks for eight pieces of graffiti, decoding a cipher, and figuring out the clues....
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These Bitcoin Easter Eggs Are Hidden in Plain Sight
Devcoins 27 Feb 2019
Crack open Bitcoin’s genesis block and inside you’ll find Satoshi’s famous headline procured from that day’s edition of The Times. “Chancellor on brink of second bailout for banks.” What nobody seemed to realize until last year was that Satoshi’s cipher actually appears a second time in the genesis block....
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Cryptocurrency Glossary | The Independent Republic
A Bit of News 28 Jan 2019
A block cipher is known as a method of encrypting or decrypting text or data one block at a time rather than one bit at a time via a shared, secret key. The height of a block is the total number of blocks in the blockchain between the block in question and the genesis block....
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