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Cryptanalysis of a data security protection scheme for VoIP

Li, CQ, Li, SJ, Zhang, D and Chen, G (2006) Cryptanalysis of a data security protection scheme for VoIP IEE Proceedings-Vision, Image & Signal Processing, 153 (1). 1 - 10. ISSN 1350-245X

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Abstract

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.

Item Type: Article
Additional Information: This paper is a postprint of a paper submitted to and accepted for publication in IEE Proceedings-Vision, Image & Signal Processing and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.
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Divisions: Faculty of Engineering and Physical Sciences > Computing Science
Depositing User: Symplectic Elements
Date Deposited: 11 May 2012 19:43
Last Modified: 23 Sep 2013 19:26
URI: http://epubs.surrey.ac.uk/id/eprint/532578

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