journal6 ›› 2011, Vol. 32 ›› Issue (4): 42-45.

• Computer • Previous Articles     Next Articles

Improvement on Voice Encryption Algorithm A5


  1. (Telecommunication School,Hangzhou University of Electronic Science and Technology,Hangzhou 310018,China)
  • Online:2011-07-25 Published:2012-04-07

Abstract: The register series of voice encryption algorithm A5 are too short,and its resistance to brute-force attack is weak.So a simple self-synchronizing stream cipher is proposed for encrypting large amounts of voice data and the transmission.In order to generate the long initial key from the short seed key,which is used to initialize the register of self-synchronization,a simple but very high nonlinear key expansion algorithm is designed.A strong random initial key sequence can be obtained by using the algorithm proposed.Then,a delayer is used to test the efficiency of encryption algorithms.It proves that the algorithms can be used in voice encryption safely.

Key words: voice encryption, synchronization sequence, key expansion, clock stop and go

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