Data interaction

A data interaction method, applied to a first member node of a first alliance network comprising an operation node and a plurality of member nodes, the plurality of member nodes comprising the first member node and a second member node, wherein the first alliance network is constructed based on a second alliance network comprising the operation node and a plurality of initial member nodes, the plurality of initial member nodes being not interoperable, the plurality of member nodes being part of the initial member node, wherein the plurality of member nodes of the first alliance network are interoperable and performs a cooperative computational task, the data interaction method comprising:

• encrypting first interaction data between the first member node and the second member node based on a public key of the second member node to obtain first encrypted data;
• signing first data based on a private key of the first member node to obtain first signed data, the first data comprising the first interaction data and/or the first encrypted data;
• generating a first access token for a first node based on the first encrypted data and a first initial access token for the first node;
• generating a first request message for data interaction between the first member node and the second member node based on the first encrypted data, the first signed data and the first access token;
• and
• sending the first request message to the first node;
• upon receiving a second request message from the second node that is one of the operation node and a fourth member node, obtaining a first authentication result for the fourth member node based on a second access token in the second request message, wherein the fourth member node is one of the plurality of member nodes other than the first member node, and the second request message further comprises fourth encrypted data and fourth signed data, the fourth encrypted data being obtained by the fourth member node encrypting second interaction data between the fourth member node and the first member node based on a public key of the first member node, the fourth signed data being obtained by the fourth member node signing the second interaction data based on a private key of the fourth member node;
• in response to determining that the first authentication result indicates that the fourth member node is authenticated, performing signature verification on the fourth signed data in the second request message based on a public key of the fourth member node to obtain a first verification result;
• and
• in response to determining that the first verification result indicates that the second interaction data is not tampered with, decrypting the fourth encrypted data in the second request message based on the private key of the first member node to obtain the second interaction data.