Deriving Rijndael Key from Plain and Cipher Text
Posted: Thu Jul 01, 2010 8:49 am
I'm implementing a solution for managing licenses using PHP's mycrypt functions - see example #2 at http://www.php.net/manual/en/function.m ... e-open.php.
I'm not going to go into massive detail of how my solution works, but what I want to know is if a person knows the:
1) Plain text
2) Ciphered version of that plain text
3) Initiation vector used to create that cipher text
Can they derive the encryption key used to convert the plain text to cipher text? I'm using rijndael-128.
I'm not going to go into massive detail of how my solution works, but what I want to know is if a person knows the:
1) Plain text
2) Ciphered version of that plain text
3) Initiation vector used to create that cipher text
Can they derive the encryption key used to convert the plain text to cipher text? I'm using rijndael-128.