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Hi Jonathan,

Yes I understand Hemanth but the inverse key is not an output of the 
AES core, I dont know where to access it.  Everything you said makes 
perfect sense so if I could figure out how to access the inverse key I'll 
be fine.  Thanks!

----- Original Message ----- 
From: Hemanth<hemanths@d...> 
To: 
Date: Wed Oct 18 13:37:36 CEST 2006 
Subject: [oc] AES128 Question 

> Hi Jonathan, 
> I am sorry for not being able to reply earlier, I have been 
> travelling a 
> lot and hardly have checked my mails in between. Hmm.. that was a 
> long 
> time back and dont remember exactly but if my memory is correct the 
> inverse key is the key that is output after an encryption is 
> completed. If 
> you observe, both data and key undergo a series of transformation 
> and at 
> the end there is both a garbled key and encrypted data coming out. 
> This 
> key is taken as the inverse key for decryption. Infact I have used 
> one set 
> of key pairs as default in my test bench. This information is also 
> explained in the FIPS document. 
> Hope this helps, 
> Hemanth 
> > While using the AES128 core (aes_crypto_core) I have come 
> across a 
> > problem; after encrypting data with a key and receiving an 
> output, how 
> > do I know what the inverse key is in order to decrypt the 
> output? I had 
> > an example from the fips document about AES so I was able to 
> test 
> > given their key and output key, and was successful in doing 
> so. 
> > However, making up a key wont work for me as I have no idea 
> what the 
> > inverse key is. Clearing this issue up would really help me 
> out. Thanks. 
> > _______________________________________________ 
> > http://www.opencores.org/mailman/listinfo/cores 
> > 
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