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 ?
HIGHT: A new block cipher suitable for low-resource device," in Proc.
Wagner, Twofish: A 128-bit block cipher, NIST AES Proposal 15 (1998).
Recommendation for block cipher modes of operation.
Strengths: (a) various instances of output generated by this block cipher are: 88, 128, 160, 224 and 256 bits and (b) secure against collision, preimage and second preimage.
The development of CLEFIA maintains superior security based on the latest block cipher design theory.
These operations are all that is behind DES, which is an iterated block cipher, a cryptosystem on a block of symbols that sequentially repeats an internal function, called a round.
DES (Data Encryption Standard) An old, widely tested and trusted private-key algorithm developed by the National Security Agency; a block cipher that uses sixteen iterations.
Several block cipher modes of operation have been proposed in the literature to protect sensitive information.
To ensure a secure data exchange between the API(s) and the LMS, UpsideLMS uses Advanced Encryption Standard or AES, which is a symmetric block cipher used by the U.
The alternative to this approach of modifying an existing block cipher and to have an efficient hardware model, is a completely new structure that has been designed as PRESENT [11].
If the communication network provides the option for additional data encryption, it is applied as second level of encryption through a standard block cipher AES or DES.
AES is a symmetric block cipher that encrypts/decrypts data in several rounds by taking a fixed block of 128 bits of data and producing the encrypted data.