Method and apparatus for obtaining input of secure multiparty computation protocol

A system for privacy protection, wherein the system acts as a second computing device and comprises one or more processors and one or more non-transitory computer-readable memories coupled to the one or more processors and configured with instructions executable by the one or more processors to cause the system to perform operations comprising:

• receiving a data request for object data from a first computing device, wherein the object data is associated with an object and is stored in the second computing device;
• performing encryption of the object data using a public key associated with the object based on the data request to generate a first ciphertext;
• obtaining verification data based on the first ciphertext for verifying whether a ciphertext to be verified corresponds to the object data;
• and
• sending the verification data to the first computing device for the first computing device to execute a cryptography protocol with a third computing device based on the verification data.

A method for privacy protection, wherein the method is performed by a first computing device and comprises:

• sending a data request for object data to a second computing device, wherein the object data is associated with an object and is stored in the second computing device;
• obtaining a second ciphertext corresponding to the object data, wherein the second ciphertext is an encrypted ciphertext based on a public key of the object;
• receiving verification data from the second computing device;
• and
• sending the second ciphertext and the verification data to a third computing device to execute a cryptography protocol with the third computing device based on the verification data.