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  1. #1
    Senior Coder
    Join Date
    Apr 2003
    Thanked 13 Times in 13 Posts

    AES exchanging IVs

    If I want to encrypt and later decrypt something with AES (CBC mode) I need to have a key and an initial vector (IV).

    I can keep the key secret (it is only me that will be encrypting and decrypting) as much as I could keep a private key secret in asymmetric encryption. The problem is the IV. Should I use the same IV every time (that really can't be a good idea) or should I put the IV in with the encrypted data (that also can't be a very good idea).

    The only other alternative I can think of is using asymmetric encryption for the IV so that only I can decrypt it.

    What is the normal approach to this?
    Last edited by ghell; 09-10-2008 at 03:03 PM.


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