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.
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Notes
- 1.
An adversary can select \(pk_\text {TS}\).
- 2.
An adversary needs to declare a release time that it wants to attack before getting any public key and can selects \(pk_\text {R}\).
- 3.
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Acknowledgement
Gwangbae Choi is supported by the Swiss National Science Foundation (SNSF) Proejct funding no. 169110.
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Choi, G., Vaudenay, S. (2020). Timed-Release Encryption with Master Time Bound Key. In: You, I. (eds) Information Security Applications. WISA 2019. Lecture Notes in Computer Science(), vol 11897. Springer, Cham. https://doi.org/10.1007/978-3-030-39303-8_13
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