Roger Needham pioneered the idea of protecting passwords with a one-way hash and built the basis upon which the Kerberos protocol is built.
But he just couldn't catch a break with designing block ciphers, even though they are all very elegant.
TEA, XTEA, Block TEA, and XXTEA are all either weak or broken.
There is an "XTEA2" cipher was designed by Alexander Pukall, released in 2006. I can't find any analysis on it however.
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