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 # |
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Date of Issue |
2004-07-14 (ISEC) |
ISSN |
Print edition: ISSN 0913-5685 |
Download PDF |
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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) |
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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) |
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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 |
8 |
Date of Issue |
2004-07-14 (ISEC) |