Paper 2019/904

Timed-Release Encryption With Master Time Bound Key (Full Version)

Gwangbae Choi and Serge Vaudenay

Abstract

Timed-release encryption allows senders to send a message to a receiver which cannot decrypt until a server releases a time bound key at the release time. The release time usually supposed to be known to the receiver, the ciphertext therefore cannot be decrypted if the release time is lost. We solve this problem in this paper by having a master time bound key which can replace the time bound key of any release time. We first present security models of the timed-release encryption with master time bound key. We present a provably secure construction based on the Weil pairing.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Published elsewhere. Minor revision. WISA 2019
Keywords
timed-release encryptionWeil pairingbilinear Diffie-Hellman problem
Contact author(s)
gwangbae choi @ epfl ch
serge vaudenay @ epfl ch
History
2019-08-08: received
Short URL
https://ia.cr/2019/904
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2019/904,
      author = {Gwangbae Choi and Serge Vaudenay},
      title = {Timed-Release Encryption With Master Time Bound Key (Full Version)},
      howpublished = {Cryptology ePrint Archive, Paper 2019/904},
      year = {2019},
      note = {\url{https://eprint.iacr.org/2019/904}},
      url = {https://eprint.iacr.org/2019/904}
}
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