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Published in:
2005 | OriginalPaper | Chapter
Similar Keys of Multivariate Quadratic Public Key Cryptosystems
Authors : Yuh-Hua Hu, Lih-Chung Wang, Chun-Yen Chou, Feipei Lai
Published in: Cryptology and Network Security
Publisher: Springer Berlin Heidelberg
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Most multivariate schemes have potentially much higher performance than other public key cryptosystems[15] [4] [1] [2]. Wolf and Preneel [16] show multivariate quadratic public key schemes have many equivalent keys and provide some transformations to identify the keys. In this paper, we propose the idea of similar keys of MQ-based public key cryptosystems(PKCs) and provide a method to reduce the size of private key in MQ-based PKCs to 50% ~ 70% of its original size. And our method is generic for most MQ-based PKCs except for UOV-like and STS-like schemes. Moreover, our method remains the equivalent security and efficiency with original MQ-based PKCs.