Hello i have just recently started learning about cryptography, so i was doing some little research on what kind of encryption techniques and modes that were used in bank web pages. I have noticed that some bank uses the AES_256_CBC with HMAC SHA1 and banks that uses AES_128_GCM...I have seen more banks using AES_128_GCM or AES_128_CBC over AES_256_CBC... So i would like to ask if there are any major advantages of using AES_128_GCM/CBC over AES_256_CBC or they are more or less the same and it is just a preferential
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