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Paper Abstract and Keywords
Presentation 2006-06-23 13:00
Relationships between Data-Privacy and Key-Privacy
Ryotaro Hayashi, Keisuke Tanaka (Tokyo Inst. of Tech.)
Abstract (in Japanese) (See Japanese page) 
(in English) The classical security requirement
of public-key encryption schemes is
that it provides privacy
of the encrypted data.
Popular formalizations
such as one-wayness (OW) or indistinguishability (IND)
are directed at capturing
various data-privacy requirements.
Bellare, Boldyreva, Desai, and Pointcheval
proposed a new security requirement of encryption schemes called
``key-privacy'' or ``anonymity''
(IK, which means ``indistinguishability of keys.'').
It asks that an encryption scheme provides
privacy of the key under which the
encryption was performed.
Related to this security notion,
Halevi provided a simple sufficient condition
(which we denote IKR)
and he showed
IND and IKR implies IK.
Recently, Hayashi and Tanaka
proposed a new definition of the anonymity property,
which we call the strong anonymity (sIK).
In this paper, we show the relationships
between data-privacy (IND, OW) and key-privacy (IK, IKR, sIK).
Keyword (in Japanese) (See Japanese page) 
(in English) public-key encryption / anonymity / indistinguishability / one-wayness / / / /  
Reference Info. IEICE Tech. Rep., vol. 106, no. 128, COMP2006-20, pp. 21-27, June 2006.
Paper # COMP2006-20 
Date of Issue 2006-06-16 (COMP) 
ISSN Print edition: ISSN 0913-5685
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Conference Information
Committee COMP  
Conference Date 2006-06-23 - 2006-06-23 
Place (in Japanese) (See Japanese page) 
Place (in English) Saitama Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To COMP 
Conference Code 2006-06-COMP 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Relationships between Data-Privacy and Key-Privacy 
Sub Title (in English)  
Keyword(1) public-key encryption  
Keyword(2) anonymity  
Keyword(3) indistinguishability  
Keyword(4) one-wayness  
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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Speaker Author-1 
Date Time 2006-06-23 13:00:00 
Presentation Time 35 minutes 
Registration for COMP 
Paper # COMP2006-20 
Volume (vol) vol.106 
Number (no) no.128 
Page pp.21-27 
Date of Issue 2006-06-16 (COMP) 

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