Aggregatable Signature-Based Broadcast Sample Clauses

Aggregatable Signature-Based Broadcast. An ASBB scheme can be used simultaneously as a signature scheme anda broad- cast scheme. It exploits the duality between decryption keys and signatures which has been noticed in ID-based encryption [3] and certificate-based encryption [17], but the encryption in ASBB does not take input the receivers’ identities. The security of an ASBB scheme incorporates the standard notion of security for a signature scheme, i.e., existential unforgeability under a chosen message attack (EUF-CMA) [18] and the security as an encryption scheme. Definition 6 (Aggregatable signature-based broadcast). An ASBB scheme consists of six polynomial-time algorithms: ← – π ParaGen(1λ): On input a security parameter λ, output the public pa- rameters π. ← – (pk, sk) KeyGen(π): On input π, output a public/secret key pair (pk, sk). ← – σ Sign(pk, sk, s): On input the key pair (pk, sk) and any string s, output a signature σ. ← – 0/1 Verify(pk, s, σ): On input the public pk and a signature σ of string s, output 0 or 1. ← – c Encrypt(pk, m): On input a public key pk and a plaintext m, output a ciphertext c. ← – m Decrypt(pk, s, σ, c): On input the public key pk, any valid string- signature (s, σ) and a ciphertext c, output the plaintext m. − |
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