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Paper Abstract and Keywords
Presentation 2015-03-02 14:30
An Extension of the Polynomial Ring-based Fully Homomorphic Encryption Scheme to a Multikey Scheme
Tomoki Hayafuji, Masahiro Mambo (Kanazawa Univ.) IT2014-68 ISEC2014-81 WBS2014-60
Abstract (in Japanese) (See Japanese page) 
(in English) Multikey homomorphic encryption is an extended variant of a single key homomorphic encryption where ciphertexts encrypted under different keys are fed into an evaluation function. The LTV scheme proposed by Lopez-Alt et al. in 2012 is a multikey fully homomorphic encryption scheme based on the NTRU encryption and can encrypt a message of only one bit. Bos et al. proposed an improved scheme of the LTV scheme, called BLLN scheme, encrypting a message of multi-bit. Unfortunately, the BLLN scheme achieves full homomorphism only for a single key. In this paper, we extend the BLLN scheme to a multi-key scheme and construct a multikey fully homomorphic encryption scheme which can encrypt a message of multi-bit.
Keyword (in Japanese) (See Japanese page) 
(in English) multikey homomorphic encryption / RLWE / DSPR / multi-bit message / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 471, ISEC2014-81, pp. 39-46, March 2015.
Paper # ISEC2014-81 
Date of Issue 2015-02-23 (IT, ISEC, WBS) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IT2014-68 ISEC2014-81 WBS2014-60

Conference Information
Committee ISEC IT WBS  
Conference Date 2015-03-02 - 2015-03-03 
Place (in Japanese) (See Japanese page) 
Place (in English) The University of Kitakyushu 
Topics (in Japanese) (See Japanese page) 
Topics (in English) joint meeting of IT, ISEC, and WBS 
Paper Information
Registration To ISEC 
Conference Code 2015-03-ISEC-IT-WBS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An Extension of the Polynomial Ring-based Fully Homomorphic Encryption Scheme to a Multikey Scheme 
Sub Title (in English)  
Keyword(1) multikey homomorphic encryption  
Keyword(2) RLWE  
Keyword(3) DSPR  
Keyword(4) multi-bit message  
1st Author's Name Tomoki Hayafuji  
1st Author's Affiliation Kanazawa University (Kanazawa Univ.)
2nd Author's Name Masahiro Mambo  
2nd Author's Affiliation Kanazawa University (Kanazawa Univ.)
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Date Time 2015-03-02 14:30:00 
Presentation Time 25 
Registration for ISEC 
Paper # IEICE-IT2014-68,IEICE-ISEC2014-81,IEICE-WBS2014-60 
Volume (vol) IEICE-114 
Number (no) no.470(IT), no.471(ISEC), no.472(WBS) 
Page pp.39-46 
#Pages IEICE-8 
Date of Issue IEICE-IT-2015-02-23,IEICE-ISEC-2015-02-23,IEICE-WBS-2015-02-23 

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