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Reducing the Spread of Damage of Key Exposures in Key-Insulated Encryption
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Public-Key Encryption
Reducing the Spread of Damage of Key Exposures in Key-Insulated Encryption
Thi Lan Anh Phan1 , Yumiko Hanaoka2 , Goichiro Hanaoka3 , Kanta Matsuura1 and Hideki Imai3 
| (1) |
The University of Tokyo, Japan |
| (3) |
National Institute of Advanced Industrial Science and Technology, Japan |
Abstract
A proposal for key exposure resilient cryptography called, key-insulated public key encryption (KIPE), has been proposed by Dodis, Katz, Xu, and Yung [6] in which the secret key is changed over time so that the exposure
of current key minimizes the damage overall. We take this idea further toward betterment by introducing new schemes with improved
helper key security: in our schemes, we introduce an auxiliary helper key to update the secret key less frequently than the main helper key (and only one of these keys is used at each key updates,)
as a result, this gives added protection to the system, by occasional auxiliary key updates, reducing the spread of further
harm that may be caused by key exposure when compared to the original KIPE. Our proposed schemes are proven to be semantically
secure in the random oracle model.
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