block cipher

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block cipher

[′bläk ‚sī·fər]
(communications)
A cipher that transforms a string of input bits of fixed length into a string of output bits of fixed length.

block cipher

An encryption method that processes the input stream as groups of bytes that are fixed in size, typically 64, 128 or 256 bits long. The state of a block cipher is reset before processing each block. The DES and AES algorithms are examples of block ciphers (see DES and AES). Contrast with stream cipher.
References in periodicals archive ?
Block ciphers play a large part in the process of constructing numerous symmetric cryptographic plans whose core security is determined by the ability of the underlying block ciphers to fight the existing cryptanalytic technologies.
The microcontroller features AES 128/256, SHA 256, block ciphers for code protection, key wrap, and hash message authentication code (HMAC) encryption to provide stronger IP protection and better defense against malware and misuse.
HIGHT is a lightweight block cipher that has attracted a lot of attention because it is constructed by only ARX operations (modular addition, bitwise rotation, bitwise shift, and XOR), which exhibits high performance in terms of hardware compared to other block ciphers.
Heys, "Analysis of the statistical cipher feedback mode of block ciphers," IEEE Transactions on Computers, vol.
For this reason, existing block ciphers use a SPN (substitution and permutation network) architecture such as AES [2], which requires a considerable amount of memory to save S-boxes and the round keys and operations.
1- Symmetric (Secret-key) cryptosystems [6] where only one key is used for both encryption and decryption operations, and it is of two types: Block ciphers and stream ciphers.
Khan, "A new chaotic substitution box design for block ciphers," in Proceedings of the 1st International Conference on Signal Processing and Integrated Networks, SPIN 2014, pp.
Block ciphers have to be confined to less GEs in order to fit in lightweight applications.
Security of Block Ciphers: From Algorithm Design to Hardware Implementation
According to the MalwareHunterTeam, once installed, attackers use Rijndael block ciphers to encrypt website files and demand Bitcoin payment ranging from $140 to $415 for decryption.
One of the best-known early block ciphers is the Playfair system [1].