encryptioncryptographyaescryptanalysis

Is it possible to reverse engineer AES256?

Imagine I have this:

$cdata = AES_256($data, $pass);

AES_256 implements the AES algorithm.

If I know the content of $cdata and the content of $data and also have the AES_256() code, can I reverse engineer and find $pass?

Solution

  • Simple answer: NO.

    This has been tested, and mentioned in the Wiki link.

    A related-key attack can break up to 9 rounds of 256-bit AES. A chosen-plaintext attack can break 8 rounds of 192- and 256-bit AES, and 7 rounds of 128-bit AES, although the workload is impractical at 2128 - 2119.

    Or put it another way: you have a better chance of being struck by lighting... on the same day you win the Lottery, than breaking it!