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Possible Duplicate:
Using CBC with fixed IV

I am using AES in CBC mode.

For some reasons I have some issues for transmiting the IV. So I am using a fixed IV.

If the first 128bits of the message, change on every message (like a timestamp). Does that can moderate the issue of having a fixed IV ?

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merged by Paŭlo Ebermann Jan 23 '13 at 9:31

This question was merged with Using CBC with a fixed IV and a random first plaintext block because it is an exact duplicate of that question.