Generalized Hierarchical Identity-Based Signcryption

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Provided by: Academy Publisher
Topic: Security
Format: PDF
Identity-Based Encryption (IBE) is a public-key encryption scheme where one's public key can be freely set to any value (such as one's identity). In this paper, the authors propose a generic method to construct hierarchical identity-based signcryption scheme. Using this method, a hierarchical identity-based signcryption scheme can be converted from any hierarchical identity-based encryption scheme. Then, they give a concrete instantiation, which is the first constant-size fully secure hierarchical identity-based signcryption scheme in the standard model. Furthermore, their scheme can achieve CCA2 security level without using any additional cryptography primitive.
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