Abstract
Timed-Release Encryption(TRE) is an encryption mechanism that allows a receiver to decrypt a ciphertext only after the time that a sender designates. In this paper, we propose the notion of Timed-Release Certificateless Encryption(TRCLE), and define its security models. We also show a generic con-struction of TRCLE from Public-Key Encryption(PKE), Identity-Based Encryption(IBE) and one-time signature, and prove that the constructed scheme achieves the security we defined.
Highlights
This paper introduces the notion of Timed-Release Certificateless Encryption (TRCLE)
A TRCLE system consists of a key generation center (KGC), a time server (TS), senders and receivers
In the sealedbid auction based on TRCLE, each user determines whether he trusts the auctioneer of ID and attends the auction by checking the reputations and the transaction records in the past auctions organized by the user of ID
Summary
This paper introduces the notion of Timed-Release Certificateless Encryption (TRCLE). A TRCLE system consists of a key generation center (KGC), a time server (TS), senders and receivers. The KGC helps a receiver to generate a decryption key corresponding to the ID and public key of a receiver. A sender encrypts a message using an ID and a public key of a receiver and a time after which the ciphertext could be decrypted. The receiver decrypts the ciphertext using the decryption key and the time signal corresponding to the time designated by the sender. The TRCLE system does not allow the KGC to obtain the decryption key of receiver, and it allows only the receiver to decrypt the ciphertext only after the designated time. Since the former is generated by the KGC and the user but the latter only by the user, the KGC does not know the whole decryption key and cannot decrypt ciphertext
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