GCM PSEUDO DRIVER
Major Differences from TLS 1. The bit-length of the tag, denoted t , is a security parameter. Although the same hash function may also be used for the signature, I’m pretty sure that the acceptable hash algorithms are communicated differently i. For this reason, the system or protocol that implements GCM should monitor and, if necessary, limit the number of unsuccessful verification attempts for each key. I’ll update the answer and emphasize that AES is the most common choice.
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GCM is ideal for protecting packetized data because it has minimum latency and minimum operation overhead.
GCM throughput rates for state-of-the-art, high-speed communication channels can be achieved with reasonable hardware resources. For this reason, the system or protocol that implements GCM should monitor and, if necessary, limit the number of unsuccessful verification attempts for each key.
GCM can take full advantage of parallel processing and implementing GCM can make efficient use of an instruction pipeline or a hardware pipeline.
With GCM, however, an adversary can choose tags that increase this probability, proportional to the total length of the ciphertext and additional authenticated data AAD. The ciphertext blocks are treated as coefficients of a polynomial which is then evaluated at a key-dependent point H pzeudo, using finite field arithmetic.
Signed elements now include a field that explicitly specifies the hash algorithm used.
RFC – TLS Elliptic Curve Cipher Suites with SHA/ and AES Galois Counter Mode (GCM)
When both authentication and encryption need to be performed on a message, a software implementation can achieve speed gains by overlapping the execution of those operations. Note that there is a typo in the formulas in the article.
Manley and Gregg  show the ease of optimizing when using function stitching with GCM. GCM requires one block cipher operation and one bit multiplication in the Galois field per each block bit of encrypted and authenticated data.
Block ciphers security summary. This process is called function stitching,  and while in principle it can be applied to any combination of cryptographic algorithms, GCM is especially suitable. In addition, a construction is required to do expansion of paeudo into blocks of data for the purposes of key generation or validation.
Retrieved from ” https: The authentication tag is constructed by feeding blocks of data into the GHASH function and encrypting the result.
Collision attack Preimage attack Birthday attack Brute-force attack Rainbow table Side-channel attack Length extension attack.