About the Key Escrow Properties of Identity Based Encryption Schemes


  • Ruxandra Olimid University of Bucharest


Identity Based Encryption, Key Escrow, Lawful Interception


IBE (Identity Based Encryption) represents a type of public key encryption that allows a party to encrypt a message using the recipient’s identity as public key. The private keys needed for decryption are generated and distributed to each party by a KGC (Key Generation Center). The existence of such an entity in an IBE scheme allows access to the encrypted information for other parties other than the intended recipient by construction: the KGC or any other entity that receives the cryptographic keys from the KGC may perform decryption. A system that permits other parties to have access to the private keys of the users is said to have key escrow abilities. The paper performs a brief analysis of the key escrow properties of IBE schemes and gives a practical example of communication protocol that improves the key escrow capabilities.

Author Biography

Ruxandra Olimid, University of Bucharest

Faculty of Mathematics and Computer Science


M. Abe, M. Kanda "A Key Escrow Scheme with Time-Limited Monitoring for One-way Communication", The Computer Journal, 45(6), 2002, pp.661-671.

Au M.H., Liu J.K., Yuen T.H., Wong D.S. “Practical Hierarchical Identity Based

Encryption and Signature Schemes without Random Oracles”. IACR Cryptology

ePrint Archive 368, 2006.

D.Boneh, X. Boyen "Efficient Selective-ID Secure Identity-Based Encryption Without Random Oracles", Advances in Cryptology - EUROCRYPT 2004, pp.223-238.

Boneh D., Boyen X., Goh E. “Hierarchical Identity Based Encryption with Constant Size Ciphertext”, Eurocrypt 2005, LNCS vol.3494, Springer, 2005, pp.440-456.

D.Boneh, M. Franklin "Identity-Based Encryption from the Weil Pairing", Crypto 2001, pp.213-229.

R.Canetti, S.Halevi, J.Katz "A Forward-Secure Public Key Encryption Scheme", Advances in Cryptology - EUROCRYPT 2003, pp.255-271.

Gentry C., Silverberg A “Hierarchical ID-Based Cryptography”, Asyacrypt LNCS vol.2501, Springer, 2002, pp.548-566.

K.Han, C.Y.Yeun, T.Shon, J.Park, K.Kim "A scalable and effcient key escrow model for lawful interception of IDBC-based secure ommunication", Int. Journal of Communication Systems 24(4), 2011, pp.461-472.

R. Olimid “Using Identity Based Encryption as Key Escrow Systems”, Proceedings of the International Conference on Security for Information Technology and Communications – SECITC 2012, pp.99-106.

A. Shamir "Identity-Based Cryptosystems and Signature Schemes", Crypto 1984, pp.47-53.

B.Waters "Efficient Identity-Based Encryption Without Random Oracles", Advances in Cryptology - EUROCRYPT 2005, pp.114-127.




How to Cite

Olimid, R. (2012). About the Key Escrow Properties of Identity Based Encryption Schemes. Journal of Mobile, Embedded and Distributed Systems, 4(3), 140-149. Retrieved from http://www.jmeds.eu/index.php/jmeds/article/view/75