Abstract: This paper analyzes the data security and privacy protection in commodity trading from the perspective of security performance. Taking the single bidding transaction model as an example, the blind signature technology is used to authenticate the users identity without relying on the credibility of the third party authentication agency, it realized the secret of the users identity information. The Bit commitment agreement is used during the transaction to guarantee the non-repudiation of both parties. The result of security analysis shows that the scheme can effectively protect the security of the transaction process even if the third party is not trusted.

Key words: commodity trading, authentication, blind signature, Bit commitment agreement, security performance