TAILIEUCHUNG - Announcing the Advanced encryption standard (AES)

Announcing the Advanced encryption standard (AES) may be used by federal departments and agencies when an agency determines that sensitive (unclassified) information (as defined in p. l. 100 235) requires cryptographic protection.  | Federal Information Processing Standards Publication 197 November 26 2001 Announcing the ADVANCED ENCRYPTION STANDARD AES Federal Information Processing Standards Publications FIPS PUBS are issued by the National Institute of Standards and Technology NIST after approval by the Secretary of Commerce pursuant to Section 5131 of the Information Technology Management Reform Act of 1996 Public Law 104-106 and the Computer Security Act of 1987 Public Law 100-235 . 1. Name of Standard. Advanced Encryption Standard AES FIPS PUB 197 . 2. Category of Standard. Computer Security Standard Cryptography. 3. Explanation. The Advanced Encryption Standard AES specifies a FIPS-approved cryptographic algorithm that can be used to protect electronic data. The AES algorithm is a symmetric block cipher that can encrypt encipher and decrypt decipher information. Encryption converts data to an unintelligible form called ciphertext decrypting the ciphertext converts the data back into its original form called plaintext. The AES algorithm is capable of using cryptographic keys of 128 192 and 256 bits to encrypt and decrypt data in blocks of 128 bits. 4. Approving Authority. Secretary of Commerce. 5. Maintenance Agency. Department of Commerce National Institute of Standards and Technology Information Technology Laboratory ITL . 6. Applicability. This standard may be used by Federal departments and agencies when an agency determines that sensitive unclassified information as defined in P. L. 100-235 requires cryptographic protection. Other FIPS-approved cryptographic algorithms may be used in addition to or in lieu of this standard. Federal agencies or departments that use cryptographic devices for protecting classified information can use those devices for protecting sensitive unclassified information in lieu of this standard. In addition this standard may be adopted and used by non-Federal Government organizations. Such use is encouraged when it provides the desired security for commercial

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