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Exposing a secret-key is one of the most disastrous threats in cryptographic protocols. The key-insulated security is proposed with the aim of realizing the protection against such key-exposure problems. In this paper, we study key-insulated authentication schemes with information-theoretic security. More specifically, we focus on one of information-theoretically secure authentication, called multireceiver...
The blind signature scheme introduced by Chaum allows a user to obtain a valid signature for a message from a signer such that the message is kept secret for the signer. Blind signature schemes have mainly been studied from a viewpoint of computational security so far. In this paper, we study blind signatures in unconditional setting. Specifically, we newly introduce a model of unconditionally secure...
In this paper, we study key-agreement which realizes the protection against key-exposure problems in the information-theoretic security setting. And we newly define a model and security notions for information-theoretically secure key-insulated key-agreement (KI-KA for short). In addition, we show tight lower bounds of sizes of entities' secret-keys required for KI-KA. We also propose constructions...
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