Privacy-Preserving Scheme in the Blockchain Based on Group Signature with Multiple Managers

Abstract

Group signature can provide the privacy-preserving authentication mechanism for the blockchain. In the traditional blockchain privacy-preserving scheme based on the group signature, there is only one group manager to revoke the anonymity. Thus, the traditional scheme will have single point of failure and key escrow problems. To solve these problems, we propose a privacy-preserving scheme in the blockchain based on the group signature with multiple managers. Our scheme is constructed based on bilinear pairing and the technique of distributed key generation. Finally, we analyze the application of the proposed scheme in the field of blockchain-based provable data possession (PDP), as well as the correctness and security of the scheme.

Auditable anonymous authentication scheme for cross-chain data transmission

“…In this section, we design an efficient privacy-preserving authentication scheme for cross-chain data transmission. As said above, the main technique of privacy-preserving authentication in existing related works includes group signature 8 , linkable ring signature 9 , and zero-knowledge 10 , and so on. However, all of these schemes need complex cryptographic computation, and thus reduce the efficiency of the authentication scheme.…”

“…We compare our scheme to the four authentication schemes [3], [8], [14], [15] for blockchain-based with respect to signing cost, verification cost. The results are listed in Table 1: According to the table, we can easily observe that ours pseudo-identity anonymous authentication scheme based on TEE has lower computation costs compared to the other anonymous authentication schemes.…”