System and method for securely synchronizing and integrating data stored in databases associated with multiple entities

A method, comprising:

• accessing a first user data set and a second user data set, wherein the second user data set comprises a homomorphically-encrypted data set, and wherein the first user data set is sourced from a first database associated with a first entity and the second user data set is sourced from a second database associated with a second entity, the second entity being separate from the first entity;
• executing a predictive model trained to generate a homomorphically-encrypted recommendation of an identified interaction for a user based at least in part upon the first user data set and the homomorphically-encrypted data set, wherein the user is associated with at least one of the first entity or the second entity;
• transmitting the homomorphically-encrypted recommendation of the identified interaction for the user to a computing system associated with the second database and the second entity;
• receiving, from the computing system associated with the second database and the second entity, a decrypted recommendation of the identified interaction for the user;
• and
• transmitting the decrypted recommendation to a computing system associated with the user.

A non-transitory computer-readable medium storing instructions that, when executed by one or more processors, cause the one or more processors to:

• access a first user data set and a second user data set, wherein the second user data set comprises a homomorphically-encrypted data set, and wherein the first user data set is sourced from a first database associated with a first entity and the second user data set is sourced from a second database associated with a second entity, the second entity being separate from the first entity;
• execute a predictive model trained to generate a homomorphically-encrypted recommendation of an identified interaction for a user based at least in part upon the first user data set and the homomorphically-encrypted data set, wherein the user is associated with at least one of the first entity or the second entity;
• transmit the homomorphically-encrypted recommendation of the identified interaction for the user to a computing system associated with the second database and the second entity;
• receive, from the computing system associated with the second database and the second entity, a decrypted recommendation of the identified interaction for the user;
• and
• transmit the decrypted recommendation to a computing system associated with the user.