Turing (cipher)
Turing is a stream cipher developed by Gregory G. Rose and Philip Hawkes at Qualcomm for CDMA.[1]
Turing generates 160 bits of output in each round by applying a non-linear filter to the internal state of an LFSR. It is named after Alan Turing.[1] It was developed based on the SOBER cipher introduced by Rose in 1998.[2] This is evident in its major component, the Linear Feedback Shift Register (LFSR), which is the same technology found in the family of SOBER machines.[3] Turing, however, is distinguished from its predecessors by the way it produces five words (five times more) of output for every internal update.[2] It also provides up to 256-bit key strength and is designed to be fast in software,[3] achieving around 5.5 cycles/byte on some x86 processors.
There are experts who found that the Turing stream cipher has a number of weaknesses when faced with chosen IV attacks.[4] For instance, its key scheduling algorithm has the same secret key for different initialization vectors and this is found to lower the system's security.[4]
See also
[edit | edit source]References
[edit | edit source]- ^ a b Gregory G. Rose and Philip Hawkes, Turing: A Fast Stream Cipher, Fast Software Encryption 2003, pp. 290–306 (PDF).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
Bibliography
[edit | edit source]- Antoine Joux and Frédéric Muller, A Chosen IV Attack Against Turing, Selected Areas in Cryptography 2003, pp. 194–207 (PDF).
