OFB - Output feedback mode

Acrónimos: OFB

Ver:

·         Modo de operación (1)

·         [NIST-SP800-38A:2001]

·         [FIPS-81:1980]

·         Criptografía de clave secreta

·         Valor de inicialización

·         http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation

OFB - Output feedback mode

Modalidad de cifrado de flujo cuyo generador de la serie cifrante está constituido por un cifrado de bloques seguido por un selector de bits. [Ribagorda:1997]

(en) output feedback (OFB)

(N) A block cipher mode that modifies ECB mode to operate on plaintext segments of variable length less than or equal to the block length. [FP081] (See: block cipher, [SP38A].) [RFC4949:2007]

(en) OFB - Output feedback mode

The output feedback (OFB) mode makes a block cipher into a synchronous stream cipher: it generates keystream blocks, which are then XORed with the plaintext blocks to get the ciphertext. Just as with other stream ciphers, flipping a bit in the ciphertext produces a flipped bit in the plaintext at the same location. This property allows many error correcting codes to function normally even when applied before encryption.

Because of the symmetry of the XOR operation, encryption and decryption are exactly the same.

http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation

Temas relacionados

Términos