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Contributory Broadcast Encryption with Efficient Encryption and Short Cipher texts
  • Contributory Broadcast Encryption with Efficient Encryption and Short Cipher texts

Contributory Broadcast Encryption with Efficient Encryption and Short Cipher texts

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Contributory Broadcast Encryption with Efficient Encryption and Short Cipher texts

Broadcast encryption (BE) schemes allow a sender to securely broadcast to any subset of members but require a trusted party to distribute decryption keys. Group key agreement (GKA) protocols enable a group of members to negotiate a common encryption key via open networks so that only the group members can decrypt the cipher texts encrypted under the shared encryption key, but a sender cannot exclude any particular member from decrypting the cipher texts.

The proposed system bridge these two notions with a hybrid primitive referred to as contributory broadcast encryption (ConBE). In this new primitive, a group of members negotiate a common public encryption key while each member holds a decryption key. A sender seeing the public group encryption key can limit the decryption to a subset of member’s choice. The proposed system provides a ConBE scheme with short cipher texts.

The scheme is proven to be fully collusion-resistant under the decision n-Bilinear Diffie-Hellman Exponentiation (BDHE) assumption in the standard model. The proposed system presents a new BE scheme that is aggregatable. The aggregatability property is shown to be useful to construct advanced protocols.

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