Paper 2015/314

Certificate-Based Encryption Resilient to Key Leakage

Qihong Yu, Jiguo Li, Yichen Zhang, Wei Wu, Xinyi Huang, and Yang Xiang

Abstract

Certificate-based encryption (CBE) is an important class of public key encryption but the existing schemes are secure only under the premise that the decryption key (or private key) and master private key are absolutely secret. In fact, a lot of side channel attacks and cold boot attacks can leak secret information of a cryptographic system. In this case, the security of the cryptographic system is destroyed, so a new model called leakage-resilient (LR) cryptography is introduced to solve this problem. While some traditional public key encryption and identity-based encryption with resilient-leakage schemes have been constructed, as far as we know, there is no leakage-resilient scheme in certificate-based cryptosystems. This paper puts forward the first certificate-based encryption scheme which can resist not only the decryption key leakage but also the master secret key leakage. Based on composite order bilinear group assumption, the security of the scheme is proved by using dual system encryption. The relative leakage rate of key is close to 1/3.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
public-key cryptography
Contact author(s)
ljg1688 @ 163 com
History
2015-04-11: received
Short URL
https://ia.cr/2015/314
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2015/314,
      author = {Qihong Yu and Jiguo Li and Yichen Zhang and Wei Wu and Xinyi Huang and Yang Xiang},
      title = {Certificate-Based Encryption Resilient to Key Leakage},
      howpublished = {Cryptology ePrint Archive, Paper 2015/314},
      year = {2015},
      note = {\url{https://eprint.iacr.org/2015/314}},
      url = {https://eprint.iacr.org/2015/314}
}
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