An encryption code that works on one fixed-size block of data at a time - unlike a stream cipher, which encrypts data as a stream of bits, one bit at a time. Examples of block ciphers include Data Encryption Standard (DES), Rivest Cipher 2 (RS2) and Rivest Cipher 5 (RS5). See stream cipher, DES, RS2 and RS5.

a method for encrypting data in chunks (several or many contiguous bits) as opposed to encoding bit-by-bit like a stream cipher

a method of encrypting plaintext (to produce ciphertext) in which a cryptographic key (e

a particular kind of cipher

a transformation between plaintext block values and ciphertext block values, and is thus an emulated simple substitution on huge block-wide values

a type of cipher which operates on a fixed size block of data

a type of symmetric-key encryption algorithm that changes a fixed-length block of the plaintext into the same length of ciphertext

a type of symmetric-key encryption algorithm that transforms a fixed-length block of plaintext data into a block of ciphertext data of the same length

a type of symmetric-key encryption algorithm that transforms a fixed-length block of plaintext (unencrypted text

Cipher that encrypts data in blocks of a fixed size. DES, IDEA, and SKIPJACK are block ciphers.

A block cipher encrypts one block of data at a time.

An encryption scheme in which the data is divided into fixed-size blocks (often 64 bits), each of which is encrypted independently of the others. Complete independence of blocks is cryptographically undesirable, so usually a block cipher will be used in a chaining or feedback mode in which the output from one block affects the way the next is encrypted.

These algorithms work on chunks of specific sized data along with a key resulting in blocks of cipher text. The National Institute of Standards and Technology (NIST) is a federal agency that approved the Data Encryption Standard (DES) block cipher an early encryption algorithm created in the mid 1970s. The American National Standards Institute (ANSI) also set this security algorithm as the Data Encryption Algorithm (DEA) standard. Another standard developed in the 1980s is the Triple Data Encryption Standard (3DES). Some commonly used block cipher algorithms are IDEA, RC2, RC5, CAST and Skipjack.

an algorithm that encrypts data in blocks, commonly of 64 bits each.

A block cipher is an algorithm that operates on plaintext in groups of bits, called blocks. 64 bits is a typical block size.

A cipher algorithm that encrypts data in discrete units (called blocks), rather than as a continuous stream of bits. The most common block size is 64 bits. For example, DES is a block cipher. See also stream cipher.

An encryption algorithm that maps inputs of size to outputs of size ( is called the block size). Data that isn't a valid block size must somehow be padded (generally by using an encryption mode). The same input always produces the same output. See Also: Stream cipher

A type encryption algorithm that separates a data into discrete blocks and encodes each of these as a separate entity.

Algorithm s that encrypt data a chunk (e.g., 64 bits) at a time, rather than as a continuous stream of bits. cf. stream cipher.

In cryptography, a block cipher or pseudorandom function (PRF) is a symmetric key cipher that operates on fixed-length groups of bits (usually 64 or 128 bits), termed blocks, with an unvarying transformation. Block ciphers contrast with stream ciphers, which operate on individual digits one at a time. See also: cipher, stream cipher, symmetric encryption

An encryption method where the cryptographic key and algorithm are applied to a block of data, rather than to one bit at a time.

A symmetric cipher which encrypts a message by breaking it down into blocks and encrypting each block.

A symmetric cipher operating on blocks of plain text and cipher text, usually 64 or 128 bits.

A procedure that translates plain text into coded text, operating on blocks of plain text of a fixed size (usually 64 bits). Every block is padded out to be the same size, making the encrypted message harder to guess.

An encryption method that places data in fixed-size blocks before encryption. For example, a 32-byte (256 bit) message that was subjected to a 64-bit block cipher, such as DES, would be encrypted in four distinct blocks. Contrast to Stream Cipher

In cryptography, a block cipher is a symmetric key cipher which operates on fixed-length groups of bits, termed blocks, with an unvarying transformation. When encrypting, a block cipher might take a (for example) 128-bit block of plaintext as input, and output a corresponding 128-bit block of ciphertext. The exact transformation is controlled using a second input — the secret key.