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  • Flexible Timed-Release Encryption

    Maki YOSHIDA  Toru FUJIWARA  

     
    LETTER

      Vol:
    E92-A No:1
      Page(s):
    222-225

    This paper presents a new scheme for Timed-Release Encryption (TRE), which is mainly designed for global use. TRE aims to control the timing of disclosing information. The major approach to TRE assumes that any participants can receive a time token broadcasted by a trusted agent, called a time server. Our scheme is based on this approach and allows participants to generate an encrypted message that can be decrypted using designated or any authenticated time servers including even those which are authenticated after encryption. In this sense, our scheme has a more flexible framework in terms of message decryption.