The IDEA Encryption Algorithm with a 128-bit Block Length
Here’s an IDEA-variant with a 128-bit block length. While I think it’s a great idea to bring IDEA up to a modern block length, the paper has none of the cryptanalysis behind it that IDEA had. If nothing else, I would have expected more than eight rounds. If anyone wants to practice differential and linear cryptanalysis, here’s a new target for you.
Guest • January 27, 2015 7:32 AM
The use of arithmetic operations for ciphers has been criticizes on a very general level. This was taken into account in the design of IDEA-NXT, the official successor of IDEA, which supports 128 bit block length (but, like all IDEA variants, is patented). This proposal is a step backwards.