This paper introduces the concept of Accountable Authority Identity based Encryption (A-IBE). A-IBE is a new approach to mitigate the (inherent) key escrow problem in identity based encryption schemes. Our main goal is to restrict the ways in which the PKG can misbehave. In our system, if the PKG ever maliciously generates and distributes a decryption key for an Identity, it runs the risk of being caught and prosecuted.
In contrast to other mitigation approaches, our approach does not require multiple key generation authorities.
Category / Keywords: public-key cryptography / Identity based Encryption Publication Info: Revised and extended version of a paper appearing at CRYPTO 2007 Date: received 13 Sep 2007, last revised 7 Dec 2007 Contact author: vipul at cs ucla edu Available format(s): PDF | BibTeX Citation Version: 20071207:093304 (All versions of this report) Discussion forum: Show discussion | Start new discussion