block ciphers mode of operation造句

• The methods resemble the block cipher modes of operation usually used for encryption.
• Block ciphers can be used as stream ciphers; see Block cipher modes of operation.
• NIST Special Publication 800-38G, Recommendation for Block Cipher Modes of Operation : Methods for Format-Preserving Encryption.
• Different block cipher modes of operation can have significantly different performance and efficiency characteristics, even when used with the same block cipher.
• Stream ciphers, such as RC4, are vulnerable to a bit-flipping attack, as are some block cipher modes of operation . " See " stream cipher attack.
• In principle any block-oriented block cipher mode of operation can be used, but stream-cipher-like modes can already be applied to messages of arbitrary length without padding, so they do not benefit from this technique.
• In November 2007, NIST announced the release of NIST Special Publication 800-38D " Recommendation for Block Cipher Modes of Operation : Galois / Counter Mode ( GCM ) and GMAC " making GCM and GMAC official standards.
• To hide patterns in encrypted data while avoiding the re-issuing of a new key after each block cipher invocation, a method is needed to block cipher modes of operation, each describing a different solution for encrypting a set of input blocks.
• The block cipher modes ECB, CBC, OFB, CFB, CTR, and GMAC was formalized in 2007 under SP800-38D, " Recommendation for Block Cipher Modes of Operation : Galois / Counter Mode ( GCM ) and GMAC ".
• To overcome this limitation, several so-called block cipher modes of operation have been designed and specified in national recommendations such as NIST 800-38A and counter ( CTR ) mode similarly creates a key stream, but has the advantage of only needing unique and not ( pseudo-) random values as initialization vectors; the needed randomness is derived internally by using the initialization vector as a block counter and encrypting this counter for each block.