libgcrypt - Initialization Vector
tthomas at chubb.com
Thu Apr 28 19:38:31 CEST 2005
Please correct me if this the wrong list to post this type of question to.
My understanding from reading the libgcrypt info is that the
Initialization Vector "is a non-secret random string acting as a kind of
I wrote two seperate programs using libgcrypt, one to perform encryption
and one to perform decryption. Whan I pass a string to the encryption
module and then pipe its output to the decryption module I get the
correct value returned - as long as the IV is the same.
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
My question then is if the IV should behave as the documentation
suggests why isn't my test working? I suspect I have misunderstood
something in the reading or in my implementation, just not sure what.
I'll be happy to provide more details upon request.
Thanks - Tod
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