Cryptology ePrint Archive: Report 2020/712

Anonymous IBE From Quadratic Residuosity With Fast Encryption

Xiaopeng Zhao and Zhenfu Cao and Xiaolei Dong and Jinwen Zheng

Abstract: We develop two variants of Cocks' identity-based encryption. One variant has faster encryption, where the most time-consuming part only requires several modular multiplications. The other variant makes the first variant anonymous under suitable complexity assumptions, while its decryption efficiency is about twice lower than the first one. Both the variants have ciphertext expansion twice more extensive than the original Cocks' identity-based encryption. To alleviate the issue of the second variant's large ciphertext expansion, we consider using it to construct a public-key encryption with keyword search scheme with a fast encryption algorithm.

Category / Keywords: public-key cryptography / Public-key cryptography and identity-based encryption and Cocks' scheme and Quadratic residuosity and Anonymous encryption and Public-key encryption with keyword search

Date: received 13 Jun 2020, last revised 15 Sep 2020

Contact author: 1306062147 at qq com

Available format(s): PDF | BibTeX Citation

Version: 20200915:113637 (All versions of this report)

Short URL: ia.cr/2020/712


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