Provably Secure Threshold Public-Key Encryption with Adaptive Security and Short Ciphertexts

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Provided by: Elsevier
Topic: Security
Format: PDF
Threshold public-key encryption is a cryptographic primitive allowing decryption control in group-oriented encryption applications. Existing TPKE schemes suffer from long ciphertexts with size linear in the number of authorized users or can only achieve non-adaptive security, which is too weak to capture the capacity of the attackers in the real world. In this paper, the authors propose an efficient TPKE scheme with constant-size ciphertexts and adaptive security. Security is proven under the decision bilinear exponentiation assumption in the standard model.
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