Secure data devolution: Practical re-encryption with auxiliary data in LWE-based somewhat homomorphic encryption

Masaya Yasuda, Takeshi Koshiba, Takeshi Shimoyama, Jun Kogure, Kazuhiro Yokoyama

研究成果: Conference contribution

抜粋

Homomorphic encryption can support meaningful operations on encrypted data, and hence it enables users to outsource their data in encrypted format to cloud services. However, homomorphic encryption cannot operate on ciphertexts with different keys in general. To resolve the problem, re-encryption allows operations on such ciphertexts by unifying the different keys into a new one. In this paper, we focus on the scheme proposed by Brakerski and Vaikuntanathan (CRYPTO 2011), and give a practical re-encryption method. Our strategy for efficient re-encryption is to simply rewrite the decryption circuit and then to evaluate the circuit homomorphically with auxiliary information. In particular, our method requires only a few homomorphic operations for re-encryption, and it can be applied to various applications such as secure key exchange for collaboratively computing multiple users' data in the cloud.

元の言語English
ホスト出版物のタイトルSCC 2015 - Proceedings of the 3rd ACM International Workshop on Security in Cloud Computing, part of ASIACCS 2015
出版者Association for Computing Machinery, Inc
ページ53-61
ページ数9
ISBN(電子版)9781450334471
DOI
出版物ステータスPublished - 2015 4 14
イベント3rd ACM International Workshop on Security in Cloud Computing, SCC 2015 - Singapore, Singapore
継続期間: 2015 4 14 → …

出版物シリーズ

名前SCC 2015 - Proceedings of the 3rd ACM International Workshop on Security in Cloud Computing, part of ASIACCS 2015

Other

Other3rd ACM International Workshop on Security in Cloud Computing, SCC 2015
Singapore
Singapore
期間15/4/14 → …

ASJC Scopus subject areas

  • Software

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  • これを引用

    Yasuda, M., Koshiba, T., Shimoyama, T., Kogure, J., & Yokoyama, K. (2015). Secure data devolution: Practical re-encryption with auxiliary data in LWE-based somewhat homomorphic encryption. : SCC 2015 - Proceedings of the 3rd ACM International Workshop on Security in Cloud Computing, part of ASIACCS 2015 (pp. 53-61). (SCC 2015 - Proceedings of the 3rd ACM International Workshop on Security in Cloud Computing, part of ASIACCS 2015). Association for Computing Machinery, Inc. https://doi.org/10.1145/2732516.2732521