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Decoding AES256-CTS-HMAC-SHA1-96 AES256 = AES using 256-bit key CTS = ciphertext stealing HMAC-SHA1-96 = HMAC using SHA-1 hash function with mac truncated to 96 bits. The benefits of HMAC truncation are discussed in FIPS PUB 198-1, chapter 5. For HMAC-SHA1 96 bits is very common truncation, used for instance by IPsec/ESP. For figuring out what key ...
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