Universal custodian-hiding verifiable encryption for discrete logarithms

Joseph K. Liu; Patrick P. Tsang; Duncan S. Wong; Robert W. Zhu

Universal custodian-hiding verifiable encryption for discrete logarithms

Joseph K. Liu, Patrick P. Tsang, Duncan S. Wong, Robert W. Zhu

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

Abstract

We introduce the notion of Universal Custodian-Hiding Verifiable Encryption (UCH-VE) and propose a scheme of this type for discrete logarithms. A UCH-VE scheme allows an encryptor to designate t out of a group of n users and prepare a publicly verifiable ciphertext in such a way that any k of these t designated users can recover the message. The values of k and t are set arbitrarily by the encryptor. The anonymity of these t designated users will also be preserved. The UCH-VE scheme captures the notions of various types of verifiable encryption schemes that include conventional one-decryptor type, conventional threshold type, designated-1-out-of-n custodian-hiding type and designated group custodian-hiding type. On efficiency, the new scheme avoids using inefficient cut-and-choose proofs and compares favourably with the state-of-the-art verifiable encryption schemes for discrete logarithms.

Original language	English
Title of host publication	Information Security and Cryptology, ICISC 2005 - 8th International Conference, Revised Selected Papers
Publisher	Springer
Pages	389-409
Number of pages	21
ISBN (Print)	3540333541, 9783540333548
Publication status	Published - 1 Jan 2006
Externally published	Yes
Event	International Conference on Information Security and Cryptology 2005 - Seoul, Korea, Republic of (South) Duration: 1 Dec 2005 → 2 Dec 2005 Conference number: 8th https://link.springer.com/book/10.1007%2F11734727 (Proceedings)

Publication series

Name	Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume	3935 LNCS
ISSN (Print)	0302-9743
ISSN (Electronic)	1611-3349

Conference

Conference	International Conference on Information Security and Cryptology 2005
Abbreviated title	ICISC 2005
Country/Territory	Korea, Republic of (South)
City	Seoul
Period	1/12/05 → 2/12/05
Internet address	https://link.springer.com/book/10.1007%2F11734727 (Proceedings)

Cite this

Liu, J. K., Tsang, P. P., Wong, D. S., & Zhu, R. W. (2006). Universal custodian-hiding verifiable encryption for discrete logarithms. In Information Security and Cryptology, ICISC 2005 - 8th International Conference, Revised Selected Papers (pp. 389-409). (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 3935 LNCS). Springer.

Liu, Joseph K. ; Tsang, Patrick P. ; Wong, Duncan S. ; Zhu, Robert W. / Universal custodian-hiding verifiable encryption for discrete logarithms. Information Security and Cryptology, ICISC 2005 - 8th International Conference, Revised Selected Papers. Springer, 2006. pp. 389-409 (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)).

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Liu, JK, Tsang, PP, Wong, DS & Zhu, RW 2006, Universal custodian-hiding verifiable encryption for discrete logarithms. in Information Security and Cryptology, ICISC 2005 - 8th International Conference, Revised Selected Papers. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), vol. 3935 LNCS, Springer, pp. 389-409, International Conference on Information Security and Cryptology 2005, Seoul, Korea, Republic of (South), 1/12/05.

Universal custodian-hiding verifiable encryption for discrete logarithms. / Liu, Joseph K.; Tsang, Patrick P.; Wong, Duncan S.; Zhu, Robert W.

Information Security and Cryptology, ICISC 2005 - 8th International Conference, Revised Selected Papers. Springer, 2006. p. 389-409 (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); Vol. 3935 LNCS).

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

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AB - We introduce the notion of Universal Custodian-Hiding Verifiable Encryption (UCH-VE) and propose a scheme of this type for discrete logarithms. A UCH-VE scheme allows an encryptor to designate t out of a group of n users and prepare a publicly verifiable ciphertext in such a way that any k of these t designated users can recover the message. The values of k and t are set arbitrarily by the encryptor. The anonymity of these t designated users will also be preserved. The UCH-VE scheme captures the notions of various types of verifiable encryption schemes that include conventional one-decryptor type, conventional threshold type, designated-1-out-of-n custodian-hiding type and designated group custodian-hiding type. On efficiency, the new scheme avoids using inefficient cut-and-choose proofs and compares favourably with the state-of-the-art verifiable encryption schemes for discrete logarithms.

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Liu JK, Tsang PP, Wong DS, Zhu RW. Universal custodian-hiding verifiable encryption for discrete logarithms. In Information Security and Cryptology, ICISC 2005 - 8th International Conference, Revised Selected Papers. Springer. 2006. p. 389-409. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)).

Universal custodian-hiding verifiable encryption for discrete logarithms

Abstract

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