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What is a tweakable block cipher?
Pretty simple question - but I can't seem to find much information about it.
What exactly is a tweakable block cipher?
How do they differ from traditional block ciphers?
What is the 'tweak'? Is it ...
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Can I build a secure tweakable block cipher from a normal one by adding key and tweak?
Let (E,D) be a secure block cipher.
Consider the following tweakable block cipher:
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