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As usual, inserting a backdoor in a symmetric cipher becomes a lot easier if you have knowledge your adversaries lack. DES is a pretty good (counter)example of how a backdoor could be introduced in a symmetric cipher. Back in 1974, IBM and the NSA both knew about differential cryptanalysis, but they did not publish their findings. Some 16 years later, ...


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CAST5 seems to be a solid 64-bit block cipher with 128-bit key. As far as I can tell after a short literature search, it's definition is sound and unbroken, despite nearly two decades of exposure (more for the round function). CAST5 is also known as CAST-128, defined in RFC 2144 (1997), and endorsed by ISO/IEC 18033-3:2010 (current). It is a 16-round ...


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The general answer is "no, you can't authenticate someone over a wire unless they know some secret information." The only way to authenticate someone is to have them do something that no one else can do. If you're trying do to it by just sending messages between the parties, the only way I can do something that someone else can't is if I know something they ...



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