An optimal class of symmetric key generation systems
Proc. of the EUROCRYPT 84 workshop on Advances in cryptology: theory and application of cryptographic techniques
CRYPTO '93 Proceedings of the 13th annual international cryptology conference on Advances in cryptology
On Some Methods for Unconditionally Secure Key Distributionand Broadcast Encryption
Designs, Codes and Cryptography - Special issue: selected areas in cryptography I
On the Key Predistribution System: A Practical Solution to the Key Distribution Problem
CRYPTO '87 A Conference on the Theory and Applications of Cryptographic Techniques on Advances in Cryptology
Perfectly-Secure Key Distribution for Dynamic Conferences
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
Communication in key distribution schemes
IEEE Transactions on Information Theory
Unconditionally Secure Key Insulated Cryptosystems: Models, Bounds and Constructions
ICICS '02 Proceedings of the 4th International Conference on Information and Communications Security
Unconditionally Secure Anonymous Encryption and Group Authentication
ASIACRYPT '02 Proceedings of the 8th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
ISW '00 Proceedings of the Third International Workshop on Information Security
Key Predistribution Schemes and One-Time Broadcast Encryption Schemes from Algebraic Geometry Codes
Cryptography and Coding '09 Proceedings of the 12th IMA International Conference on Cryptography and Coding
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We first present two tight lower bounds on the size of the secret keys of each user in an unconditionally secure one-time use broadcast encryption scheme (OTBES). Then we show how to construct a computationally secure multiple-use broadcast encryption scheme (MBES) from a key predistribution scheme (KPS) by using the ElGamal cryptosystem. We prove that our MBES is secure against chosen (message, privileged subset of users) attacks if the ElGamal cryptosystem is secure and if the original KPS is simulatable. This is the first MBES whose security is proved formally.