We are using aes-256-cbc for encryption in our PA.
From a cryptographic perspective, though, both AES-CBC and AES-GCM are highly secure.
GCM provides authentication, removing the need for an HMAC SHA hashing function. It is also slightly faster than CBC because it uses hardware acceleration (by threading to multiple processor cores).
AES-128 provides more than enough security margin for the foreseeable future. But if you're already using AES-256, there's no reason to change.”
A larger key size provides a higher safety margin against being cracked.
So i will prefer you to choose 256 instead of 128 bit key size if you want more security.
It all depends on the each company setup.
You can use any of those it is just matter of preference.
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