[120733] in cryptography@c2.net mail archive
Double Encryption Q
daemon@ATHENA.MIT.EDU (COMINT)
Wed Apr 16 11:10:13 2008
Date: Fri, 11 Apr 2008 16:30:47 +0200
From: COMINT <comint@gmail.com>
To: cryptography@metzdowd.com
Quick system scenario:
You have packet [A].
It gets encrypted using an AES algo in a particular mode and we are
left with [zA].
More data [B] is added to that encrypted packet.
Now I have [zA]+[B] in one packet and I re-encrypt it with the same
algo/key/mode.
Have I just compromised the security somehow? I wasn't aware of
anything but something about this double encryption made something
ring in my mind so I wanted to double check...
Many thanks,
Mr Pink
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