A Perfect-Reconstruction Encryption Scheme by Using Periodically Time-Varying Digital Filters

Xuedong YANG  Masayuki KAWAMATA  Tatsuo HIGUCHI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E81-A   No.1   pp.192-196
Publication Date: 1998/01/25
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Digital Signal Processing
perfect-reconstruction encryption,  periodically time-varying digital filters,  frequency scramble,  

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This letter proposes a Perfect-Reconstruction (PR) encryption scheme based on a PR QMF bank. Using the proposed scheme, signals can be encrypted and reconstructed perfectly by using two Periodically Time-Varying (PTV) digital filters respectively. Also we find that the proposed scheme has a "good" encryption effect and compares favorably with frequency scramble in the aspects of computation complexity, PR property, and degree of security.