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Cryptanalysis of a data security protection scheme for VoIP

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4 Author(s)
Li, C. ; Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China ; Li, S. ; Zhang, D. ; Chen, G.

A voice-over-Internet protocol technique with a new hierarchical data security protection (HDSP) scheme using a secret chaotic bit sequence has been recently proposed. Some insecure properties of the HDSP scheme are pointed out and then used to develop known/chosen-plaintext attacks. The main findings are: given n known plaintexts, about (100-(50/2n))% of secret chaotic bits can be uniquely determined; given only one specially-chosen plaintext, all secret chaotic bits can be uniquely derived; and the secret key can be derived with practically small computational complexity when only one plaintext is known (or chosen). These facts reveal that HDSP is very weak against known/chosen-plaintext attacks. Experiments are given to show the feasibility of the proposed attacks. It is also found that the security of HDSP against the brute-force attack is not practically strong. Some countermeasures are discussed for enhancing the security of HDSP and several basic principles are suggested for the design of a secure encryption scheme.

Published in:

Vision, Image and Signal Processing, IEE Proceedings -  (Volume:153 ,  Issue: 1 )