AES question

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majorsoul

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Aug 13, 2009, 12:10:14 PM8/13/09
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Hi all,

At a system there are 2 black box AES engines AES1 is installed with
a key, K; the other, AES2 is installed with the key Not(K).


AES1 provides interfaces for both encryption and decryption
operations.
AES2 interface is the following: void decrypt(byte* data_to_decrypt)
-
it recieves data and decrypts it but it does not output the decrypted
data.


How strong is AES2? Can one calculate the decrypted value of AES2
assuming he knows the data_to_decrypt and can assist AES1 as we
wishes?


which types of attacks would best fit this system?


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