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AES-256

Posted on 2014-04-23
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Last Modified: 2014-04-23
I assume that AES 256 is the Advanced Encryption standard with 256 bit keys

For AES types, what is the highest AES level, and what is the lowest

Anything else I should know about AES256

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Question by:Anthony Lucia
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Dave Howe earned 500 total points
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I assume that AES 256 is the Advanced Encryption standard with 256 bit keys
That is correct, yes.

For AES types, what is the highest AES level, and what is the lowest
Supported block size is 128 bits, supported key sizes are 128, 192, and 256 bits.

Anything else I should know about AES256
AES is actually called Rijndael, and was the winner of a crypto competition to design the new American standard for encryption. Rijndael actually supports a wider range of block sizes and key sizes, but only the three listed are "officially" supported as AES.  
There is a related-key attack against AES in theory that makes 256 bit keys *weaker* than 192 bit ones. In practice though, this is not considered computationally feasible.
Both WinZip and 7-Zip support AES for encrypting archives (zipfiles)
Truecrypt supports AES for encrypting hard drives.
AES is a possible suite for SSL, and for IPSEC (vpn)

Probably lots more, but that's all I can think of interesting off the top of my head :)
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