Identity-based cryptosystems and signature schemes
Proceedings of CRYPTO 84 on Advances in cryptology
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
Unconditionally Secure Proactive Secret Sharing Scheme with Combinatorial Structures
SAC '99 Proceedings of the 6th Annual International Workshop on Selected Areas in Cryptography
A Forward-Secure Digital Signature Scheme
CRYPTO '99 Proceedings of the 19th Annual International Cryptology Conference on Advances in Cryptology
Identity-Based Encryption from the Weil Pairing
CRYPTO '01 Proceedings of the 21st Annual International Cryptology Conference on Advances in Cryptology
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
CRYPTO '96 Proceedings of the 16th Annual International Cryptology Conference on Advances in Cryptology
Key-Insulated Public Key Cryptosystems
EUROCRYPT '02 Proceedings of the International Conference on the Theory and Applications of Cryptographic Techniques: Advances in Cryptology
Some Bounds and a Construction for Secure Broadcast Encryption
ASIACRYPT '98 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
An Efficient Hierarchical Identity-Based Key-Sharing Method Resistant against Collusion-Attacks
ASIACRYPT '99 Proceedings of the International Conference on the Theory and Applications of Cryptology and Information Security: Advances in Cryptology
A New Forward-Secure Digital Signature Scheme
ASIACRYPT '00 Proceedings of the 6th International Conference on the Theory and Application of Cryptology and Information Security: Advances in Cryptology
An Identity Based Encryption Scheme Based on Quadratic Residues
Proceedings of the 8th IMA International Conference on Cryptography and Coding
An efficient threshold public key cryptosystem secure against adaptive chosen ciphertext attack
EUROCRYPT'99 Proceedings of the 17th international conference on Theory and application of cryptographic techniques
Identity-Based Key-Insulated Signature Without Random Oracles
Computational Intelligence and Security
Identity-based threshold key-insulated encryption without random oracles
CT-RSA'08 Proceedings of the 2008 The Cryptopgraphers' Track at the RSA conference on Topics in cryptology
Identity-based key-insulated signature with secure key-updates
Inscrypt'06 Proceedings of the Second SKLOIS conference on Information Security and Cryptology
INDOCRYPT'06 Proceedings of the 7th international conference on Cryptology in India
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Computer systems are constantly under attack and illegal access is a constant threat which makes security even more critical. A system can be broken into and secret information, e.g. decryption key, may be exposed. Very recently, a new framework for the protection against such key exposure problem was suggested and was called, key-insulated encryption (KIE). In this paper, we study key insulated cryptosystems without computational assumptions. First, we define the model of KIE in unconditional setting and show lower bounds on required memory sizes. Our bounds are all tight since our concrete construction of KIE achieves the bounds. In other words, this construction is optimal in terms of memory sizes of a user, a trusted device and a sender. We then, extend the concept of it further, and add an extra property so that any pair of users in the system can communicate with each other. We called the version with this added extension, dynamic and mutual key insulated encryption (DMKIE), and concrete implementations of DMKIE are also shown. Finally, we discuss the relationship among KIE, key predistribution schemes (KPS) and broadcast encryption schemes (BES), specifically, showing that DMKIE can be constructed from KPS or BES.