XTEA

In cryptography, XTEA (eXtended TEA) is a block cipher designed to correct weaknesses in TEA. The cipher's designers were David Wheeler and Roger Needham of the Cambridge Computer Laboratory, and the algorithm was presented in an unpublished technical report in 1997 (Needham and Wheeler, 1997). It is not subject to any patents.

References

• Youngdai Ko, Seokhie Hong, Wonil Lee, Sangjin Lee, and Jongin Lim. "Related key differential attacks on 26 rounds of XTEA and full rounds of GOST." In Proceedings of FSE '04, Lecture Notes in Computer Science, 2004. Springer-Verlag.
• Seokhie Hong, Deukjo Hong, Youngdai Ko, Donghoon Chang, Wonil Lee, and Sangjin Lee. "Differential cryptanalysis of TEA and XTEA." In Proceedings of ICISC 2003, 2003b.
• Dukjae Moon, Kyungdeok Hwang, Wonil Lee, Sangjin Lee, and Jongin Lim. "Impossible differential cryptanalysis of reduced round XTEA and TEA." Lecture Notes in Computer Science, 2365: 49-60, 2002. ISSN 0302-9743.
• Roger M. Needham and David J. Wheeler. "Tea extensions." Technical report, Computer Laboratory, University of Cambridge, October 1997 (PDF).
• Markku-Juhani Saarinen. "Cryptanalysis of Block TEA." Unpublished manuscript, October 1998. Can be found on the author's homepage or in the sci.crypt.research Usenet archive.