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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/10290

Title: A Timed-Release Proxy Re-Encryption Scheme
Authors: Emura, Keita
Miyaji, Atsuko
Omote, Kazumasa
Keywords: timed-release encryption
proxy re-encryption
Issue Date: 2011-08-01
Publisher: 電子情報通信学会
Magazine name: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Volume: E94-A
Number: 8
Start page: 1682
End page: 1695
Abstract: Timed-Release Encryption (TRE) is a kind of time-dependent encryption, where the time of decryption can be controlled. More precisely, TRE prevents even a legitimate recipient decrypting a ciphertext before a semi-trusted Time Server (TS) sends trapdoor sT assigned with a release time T of the encryptor's choice. Cathalo et al. (ICICS2005) and Chalkias et al. (ESORICS2007) have already considered encrypting a message intended for multiple recipients with the same release time. One drawback of these schemes is the ciphertext size and computational complexity, which depend on the number of recipients N. Ideally, it is desirable that any factor (ciphertext size, computational complexity of encryption/decryption, and public/secret key size) does not depend on N. In this paper, to achieve TRE with such fully constant costs from the encryptor's/decryptor's point of view, by borrowing the technique of Proxy Re-Encryption (PRE), we propose a cryptosystem in which even if the proxy transformation is applied to a TRE ciphertext, the release time is still effective. By sending a TRE ciphertext to the proxy, an encryptor can foist N-dependent computation costs on the proxy. We call this cryptosystem Timed-Release PRE (TR-PRE). This function can be applied to efficient multicast communication with a release time indication.
Rights: Copyright (C)2011 IEICE. Keita Emura, Atsuko Miyaji, and Kazumasa Omote, IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences, E94-A(8), 2011, 1682-1695. http://www.ieice.org/jpn/trans_online/
URI: http://hdl.handle.net/10119/10290
Material Type: publisher
Appears in Collections:b10-1. 雑誌掲載論文 (Journal Articles)

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