FIPS 198-1 defines which keyed-hash mechanism?

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Multiple Choice

FIPS 198-1 defines which keyed-hash mechanism?

Explanation:
HMAC is the keyed-hash mechanism defined by FIPS 198-1. It creates a message authentication code by combining a secret key with a hash function, then applying the hash in two passes (inner and outer) to protect against length-extension attacks. This construction provides both data integrity and authenticity, and is widely used with hash functions like SHA-1 or SHA-256 in protocols such as TLS and IPsec. The other terms refer to different concepts or standards not defined by FIPS 198-1 as the keyed-hash mechanism, such as MDC (Modification Detection Code), CMAC (a cipher-based MAC), and PKCS#1 (RSA-related).

HMAC is the keyed-hash mechanism defined by FIPS 198-1. It creates a message authentication code by combining a secret key with a hash function, then applying the hash in two passes (inner and outer) to protect against length-extension attacks. This construction provides both data integrity and authenticity, and is widely used with hash functions like SHA-1 or SHA-256 in protocols such as TLS and IPsec. The other terms refer to different concepts or standards not defined by FIPS 198-1 as the keyed-hash mechanism, such as MDC (Modification Detection Code), CMAC (a cipher-based MAC), and PKCS#1 (RSA-related).

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