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Paper Abstract and Keywords
Presentation 2004-07-21 15:10
Refrehshable Tokens with Optional Linkability
Rie Shigetomi (Univ. of Tokyo), Akira Otsuka (IPA), Keith Martin (Royal Holloway), Hideki Imai (Univ. of Tokyo)
Abstract (in Japanese) (See Japanese page) 
(in English) As more services are provided digitally and digital service providers collect more information about users, potential privacy problems are on the increase. This is particularly true when users have to present some
form of electronic token in exchange for a digital service. One way to address privacy problems is to provide digital services anonymously. The problem with many previous anonymous token services is that once a token is issued, for a particular value, it cannot be modified in any way other than to decrease the amount of credit associated with the token as it is spent. In this paper we propose a system for ”refreshing” tokens anonymously, which allows the holder of a token to request that the issuing organization reissues a modified token in an anonymous way. The new (refreshed) token includes the same embedded user identification as the original token. Unlike most previous schemes, this allows anonymous tokens to be used for applications such as foreign exchange, where tokens may need to be exchanged for refreshed tokens issued in a different monetary value. This scheme also allows anybody to check
the validity of the token (not just the token issuer). We also demonstrate how refreshable tokens can be optionally
linked, without compromising the anonymity of the owner.
Keyword (in Japanese) (See Japanese page) 
(in English) Electronic cash / Privacy Protection / Anonymous Authentication / / / / /  
Reference Info. IEICE Tech. Rep., vol. 104, pp. 165-172, July 2004.
Paper #  
Date of Issue 2004-07-14 (ISEC) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee ISEC IPSJ-CSEC  
Conference Date 2004-07-20 - 2004-07-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokushima Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To IPSJ-CSEC 
Conference Code 2004-07-ISEC-JPSCSEC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Refrehshable Tokens with Optional Linkability 
Sub Title (in English)  
Keyword(1) Electronic cash  
Keyword(2) Privacy Protection  
Keyword(3) Anonymous Authentication  
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1st Author's Name Rie Shigetomi  
1st Author's Affiliation University of Tokyo (Univ. of Tokyo)
2nd Author's Name Akira Otsuka  
2nd Author's Affiliation Information-technology Promotion Agency (IPA)
3rd Author's Name Keith Martin  
3rd Author's Affiliation Royal Holloway, University of London (Royal Holloway)
4th Author's Name Hideki Imai  
4th Author's Affiliation University of Tokyo (Univ. of Tokyo)
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Speaker Author-1 
Date Time 2004-07-21 15:10:00 
Presentation Time 25 minutes 
Registration for IPSJ-CSEC 
Paper # ISEC2004-64 
Volume (vol) vol.104 
Number (no) no.200 
Page pp.165-172 
#Pages
Date of Issue 2004-07-14 (ISEC) 


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