libgcrypt - Initialization Vector

Moritz Schulte mo at
Thu Apr 28 21:22:37 CEST 2005

On Thu, Apr 28, 2005 at 01:38:31PM -0400, Tod Thomas wrote:

> My understanding from reading the libgcrypt info is that the
> Initialization Vector "is a non-secret random string acting as a
> kind of salt value".
> Once I change the IV in one I no longer get the correct, decrypted
> string back.  I discovered this because I decided to make my IV a
> truly random value by using the output of gcry_randomize to set it
> and that failed.

Well, the IV needs to be the same for encryption and decryption; this
is so, since it has direct influence on the ciphertext (in case of
encryption) and plaintext (in case of decryption).


Moritz Schulte
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