Abstract
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.
Keywords
- MQ
- multivariate
- public key cryptosystem
- digital signature
- similar key
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Hu, YH., Wang, LC., Chou, CY., Lai, F. (2005). Similar Keys of Multivariate Quadratic Public Key Cryptosystems. In: Desmedt, Y.G., Wang, H., Mu, Y., Li, Y. (eds) Cryptology and Network Security. CANS 2005. Lecture Notes in Computer Science, vol 3810. Springer, Berlin, Heidelberg. https://doi.org/10.1007/11599371_18
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DOI: https://doi.org/10.1007/11599371_18
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-30849-2
Online ISBN: 978-3-540-32298-6
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