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You can check this answer which mentions how does the IV generated for GCM ciphers in TLS 1.2 ... is an AEAD Cipher, so it is in the form of GenericAEADCipher: struct { opaque nonce_explicit[SecurityParameters.record_iv_length]; aead-ciphered struct { opaque content[TLSCompressed.length]; }; } GenericAEADCipher; Here, the ...


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The answer "GCM is a good option as it combines encryption and integrity in one mechanism. " is a bit misleading. GCM uses one after another: 1-st encryption in counter mode and then GHASH to authenticate the data. In the recent intel processors CLMUL-NI is used to speed up the GHASH operations. Benefits of GCM over CBC+HMAC: is much faster, as the ...



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