An ID-based Broadcast Encryption Scheme for Collaborative Design

Collaborative design is one of core processes for networked manufacturing, so how to safely transfer design information in the network has important significance. In order to provide the confidentiality of transmission information on the level of design team in collaborative design system, a new broadcast encryption scheme based on designer’s identity is presented. The new scheme is based on broadcast encryption theory. By introducing master key of design teams and distributing the public and secret parameters reasonably, every designer can encrypt design documents and transmit them expediently. The encrypted document can be decrypted only by the members of the designated design team. In the new scheme the private key escrow problem of ID-based public key system is solved. Analysis shows that the new scheme is secure under the discrete logarithm assumption and users out of the designated design team can’t decrypt the documents. The new scheme can be used in the collaborative design system to protect the security of design information.