XTEA
Sign in to saveIn 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were David Wheeler and Roger Needham of the Cambridge Computer Laboratory, and the algorithm was presented in an unpublished technical report in 1997 (Needham and Wheeler, 1997).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.
Key facts
- Block cipher.name
- XTEA
- Block cipher.image
- center|300px
- Block cipher.caption
- Two Feistel rounds (one cycle) of XTEA
- Block cipher.designers
- Roger Needham, David Wheeler
- Block cipher.publish date
- 1997
- Block cipher.derived from
- TEA
- Block cipher.derived to
- Corrected Block TEA
- Block cipher.key size
- 128 bits
- Block cipher.block size
- 64 bits
- Block cipher.structure
- Feistel cipher
- Block cipher.rounds
- variable; recommended 64 Feistel rounds (32 cycles)
- Block cipher.cryptanalysis
- A related-key rectangle attack on 36 rounds of XTEA (Lu, 2009)
via Wikipedia infobox
Article
7 sectionsContents
- Implementations
- Cryptanalysis
- Block TEA
- See also
- References
- Further reading
- External links
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were David Wheeler and Roger Needham of the Cambridge Computer Laboratory, and the algorithm was presented in an unpublished technical report in 1997 (Needham and Wheeler, 1997).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.
Like TEA, XTEA is a 64-bit block Feistel cipher with a 128-bit key and a suggested 64 rounds. Several differences from TEA are apparent, including a somewhat more complex key-schedule and a rearrangement of the shifts, XORs, and additions.