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Paper Abstract and Keywords
Presentation 2004-12-17 13:10
Time-Capsule Encryption
Maki Yoshida (Osaka Univ.), Shigeo Mitsunari (u10 Networks), Toru Fujiwara (Osaka Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) We have designed a new timed-release encryption, called time-capsule encryption, and implemented it. In our scheme, a time signal signed by a public agent announces a time, and a signed time signal is used as a decryption key. A signature scheme using a pairing map is the main building block. In this paper, we introduce a recovery signal which allows those who missed a signed time signal to recover the corresponding decryption key. To introduce such a recovery signal, we construct a new time-capsule encryption scheme using another signature scheme with a pairing map and extend the new scheme to include a recovery signal.
Keyword (in Japanese) (See Japanese page) 
(in English) Timed-release encryption / time-capsule encryption / release time / time signal / signed time signal / pairing map / /  
Reference Info. IEICE Tech. Rep., vol. 104, no. 527, ISEC2004-98, pp. 1-5, Dec. 2004.
Paper # ISEC2004-98 
Date of Issue 2004-12-10 (ISEC) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee ISEC  
Conference Date 2004-12-17 - 2004-12-17 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikai-Shinko-Kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To ISEC 
Conference Code 2004-12-ISEC 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Time-Capsule Encryption 
Sub Title (in English)  
Keyword(1) Timed-release encryption  
Keyword(2) time-capsule encryption  
Keyword(3) release time  
Keyword(4) time signal  
Keyword(5) signed time signal  
Keyword(6) pairing map  
1st Author's Name Maki Yoshida  
1st Author's Affiliation Osaka University (Osaka Univ.)
2nd Author's Name Shigeo Mitsunari  
2nd Author's Affiliation u10 Networks (u10 Networks)
3rd Author's Name Toru Fujiwara  
3rd Author's Affiliation Osaka University (Osaka Univ.)
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Speaker Author-1 
Date Time 2004-12-17 13:10:00 
Presentation Time 25 minutes 
Registration for ISEC 
Paper # ISEC2004-98 
Volume (vol) vol.104 
Number (no) no.527 
Page pp.1-5 
Date of Issue 2004-12-10 (ISEC) 

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