講演抄録/キーワード |
講演名 |
2005-12-22 13:35
Universally Anonymizable Public-Key Encryption ○Ryotaro Hayashi・Keisuke Tanaka(Tokyo Inst. of Tech.) |
抄録 |
(和) |
本論文では,公開鍵暗号の新しい概念である``universally anonymizable public-key encryption''を提案する.この暗号方式をつかうと,暗号文を作った人ばかりでなく,暗号文を持っているすべての人が,秘密鍵を用いることなく,その暗号文を匿名性を満たすものに変換することができる.
さらに本論文では, ElGamal 暗号,Cramer-Shoup 暗号,RSA-OAEP 暗号に基づいた具体的な方式を提案し,その安全性を証明する. |
(英) |
We first propose the notion of universally anonymizable public-key encryption. Suppose that we have the encrypted data made with the same security parameter, and that these data do not satisfy the anonymity property. Consider the situation that we would like to transform these encrypted data to those with the anonymity property without decrypting these encrypted data.
In this paper, in order to formalize this situation, we propose a new property for public-key encryption called universal anonymizability. If we use a universally anonymizable public-key encryption scheme, not only the person who made the ciphertexts, but also anyone can anonymize the encrypted data without using the corresponding secret key.
We then propose universally anonymizable public-key encryption schemes
based on the ElGamal encryption scheme, the Cramer-Shoup encryption scheme, and RSA-OAEP, and prove their security. |
キーワード |
(和) |
公開鍵暗号 / 匿名性 / ElGamal / Cramer-Shoup / RSA-OAEP / / / |
(英) |
encryption / anonymity / ElGamal / Cramer-Shoup / RSA-OAEP / / / |
文献情報 |
信学技報, vol. 105, no. 499, COMP2005-52, pp. 21-28, 2005年12月. |
資料番号 |
COMP2005-52 |
発行日 |
2005-12-15 (COMP) |
ISSN |
Print edition: ISSN 0913-5685 |
PDFダウンロード |
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