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Paper Abstract and Keywords
Presentation 2005-03-18 09:00
RSA-based Public-Key Encryption Schemes with Anonymity
Ryotaro Hayashi, Keisuke Tanaka (Tokyo Inst. of Tech.)
Abstract (in Japanese) (See Japanese page) 
(in English) Bellare, Boldyreva, Desai, and Pointcheval proposed a new security requirement of the encryption schemes called ``key-privacy'' or ``anonymity.'' It asks that the encryption provide privacy of the key under which the encryption was performed. To construct the schemes with anonymity, it is necessary that the space of ciphertexts or signatures is common to each user.
In this paper, we focus on the techniques which can be used to obtain this anonymity property, and propose a new technique for obtaining the anonymity property on RSA-based cryptosystem, which we call ``sampling twice.'' It generates the uniform distribution over $[0, 2^k)$ by sampling the two elements from $[0,N)$ where $|N| = k$. Then, by applying the sampling twice technique, we construct the schemes for encryption, undeniable and confirmer signature, and ring signature, which have some advantages to the previous schemes.
Keyword (in Japanese) (See Japanese page) 
(in English) RSA / anonymity / encryption / undeniable signature / confirmer signature / ring signature / /  
Reference Info. IEICE Tech. Rep., vol. 104, no. 743, COMP2004-73, pp. 1-7, March 2005.
Paper # COMP2004-73 
Date of Issue 2005-03-11 (COMP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
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Conference Information
Committee COMP  
Conference Date 2005-03-18 - 2005-03-18 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To COMP 
Conference Code 2005-03-COMP 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) RSA-based Public-Key Encryption Schemes with Anonymity 
Sub Title (in English)  
Keyword(1) RSA  
Keyword(2) anonymity  
Keyword(3) encryption  
Keyword(4) undeniable signature  
Keyword(5) confirmer signature  
Keyword(6) ring signature  
1st Author's Name Ryotaro Hayashi  
1st Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
2nd Author's Name Keisuke Tanaka  
2nd Author's Affiliation Tokyo Institute of Technology (Tokyo Inst. of Tech.)
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Date Time 2005-03-18 09:00:00 
Presentation Time 25 
Registration for COMP 
Paper # IEICE-COMP2004-73 
Volume (vol) IEICE-104 
Number (no) no.743 
Page pp.1-7 
#Pages IEICE-7 
Date of Issue IEICE-COMP-2005-03-11 

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