Re: Data Compression Before or After Encryption ?

From: Tom St Denis (tomstdenis_at_iahu.ca)
Date: 10/25/04


Date: Mon, 25 Oct 2004 12:29:37 -0400

Jean-Luc Cooke wrote:
> Notice the AESEncrypt(KEY, DATA) function is a wrapper to the:
> CIPHERTEXT[i] = AES-ECB-Encrypt(KEY, DATA[i] xor IV)

Nitpick... that's not CTR mode. I don't think it would be insecure but
CTR is actually

CIPHERTEXT[i] = DATA[i] xor AES-ECB-Encrypt(KEY, IV)

Which has the added benefit of being it's own inverse.

Tom



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