New answers tagged tweakable-cipher
Key wrapping and tweakable encryption are actually quite different topics. Key wrapping is more commonly related to keys forage and key archive. Key wrapping This is fancy terminology for encryption key with another key. In key wrapping you have a master key that is used to protect one or more keys. It is generally impossible for (computationally ...
Key wrapping Key wrapping is used to... wrap keys :) One example: Suppose you want to encrypt a byte array with a public key algorithm like RSA. Since RSA is slow you would rather choose a random key for a symmetric block algorithm like AES, then encrypt the byte array with AES and just encrypt the AES key with RSA. Now the question is, how to encrypt the ...
Tweak per message offers good security like IV per message . Basically a tweakable block cipher with same tweak for all messages is same as non-tweakable block cipher. It is deterministic in nature and not considered secure enough in itself. You need to apply a mode of encryption that has been designed for non-tweakable block ciphers to make it secure.
The short answer: Tweaks and IVs play very different roles, so it's not really meaningful to compare them. If you view an encryption algorithm as a black box that takes, say, an IV and a plaintext and produces a ciphertext, there aren't any tweaks in sight. It's not until you break open the black box and look inside that you might start seeing tweaks (and ...
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