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Output Feedback (OFB)
A mode in which the Data Encryption Standard XORs plain text with a seed value. For the first encrypted block, an initialization vector is used to create the seed value. Future seed values are derived by running the DES algorithm on the preceding seed value. The major advantage of OFB mode is that transmission errors do not propagate to affect the decryption of future blocks.
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A nonsecret binary vector used as the initializing input algorithm for the encryption of a plaintext block sequence to increase security by introducing additional cryptographic variance and to synchronize cryptographic equipment.
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A private key cryptosystem published by the National Institutes of Standards and Technology (NIST). DES is a symmetric block cipher with a block length of 64 bits and an effective key length of 56 bits. DES has been used commonly for data encryption in the forms of software and hardware implementation. A standard cryptosystem proposed in 1977 for all government communications. DES and 3DES were superseded by Advanced Encryption Standard (AES) in December 2001. Cryptographic algorithm, designed for the protection of unclassified data and published by the National Institute of Standards and Technology (NIST) in Federal Information Processing Standard (FIPS) Publication 46. (FIPS 463 withdrawn 19 May 2005) (. See Triple DES) and CNSS Advisory IA/0204 Revised March 2005)
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In cryptography, a sequence of symbols that controls encryption and decryption. For some encryption mechanisms (symmetric), the same key is used for both encryption and decryption; for other mechanisms (asymmetric), the keys used for encryption and decryption are different.
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Encryption of information at its origin and decryption at its intended destination without intermediate decryption. The encryption of information at the point of origin within the communications network and postponing of decryption to the final destination point.
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A function that returns a true value when only one of the input values is true. If both values are false or both values are true, the output of the XOR function is false. The XOR (exclusiveOR) gate acts in the same way as the logical “either/or. ” The output is “true” if either, but not both, of the inputs is “true. ” The output is “false” if both inputs are “false” or if both inputs are “true. ” Another way of looking at this circuit is to observe that the output is 1 if the inputs are different, but 0 if the inputs are the same. 0
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