Hi Dean, AES-CBC is an encryption algorithm, whereas SHA is a hashing algorithm, they are seperate algorithms. AES-GCM algorithm performs both encryption and hashing functions without requiring a seperate hashing algorithm, it is the latest Suite B Next Generation algorithm and probably not supported on as ASA 5505.
So on the ASA you'd define the encryption as AES-CBC 128|192|256 and then hashing as SHA 128|192|256, that should work fine with the PA firewall.
AES-CBC is an encryption algorithm, whereas SHA is a hashing algorithm, they are seperate algorithms. AES-GCM algorithm performs both encryption and hashing functions without requiring a seperate hashing algorithm, it is the latest Suite B Next Generation algorithm and probably not supported on as ASA 5505.
Both the AES-CBC and AES-GCM are able to secure your valuable data with a good implementation. but to prevent complex CBC attacks such as Chosen Plaintext Attack(CPA) and Chosen Ciphertext Attack(CCA) it is necessary to use Authenticated Encryption. So the best option is for that is GCM.
Advanced Encryption Standard (AES) 256 is a virtually impenetrable symmetric encryption algorithm that uses a 256-bit key to convert your plain text or data into a cipher. That's a lot of jargon but don't despair—it gets a lot easier from here.
AES-hash is a secure hash mode for AES, with the same properties and key length as SHA-256. Its advantage is greater performance. Rijndael is used in 256-bit key, 256-bit block mode. First, the file to be hashed is padded to make it's length be an even multiple of the block size and include a length encoding.
Is AES-256 Encryption Crackable? AES-256 encryption is virtually uncrackable using any brute-force method. It would take millions of years to break it using the current computing technology and capabilities.
AES, the Advanced Encryption Standard is a symmetric block algorithm. This means that it takes 16-byte blocks and encrypts them. It is "symmetric" because the key allows for both encryption and decryption. In other words, to conclude, SHA isn't encryption, it's a one-way hash function.
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