System, Method, and Computer Program Product for Secure Real-Time N-Party Computation

A computer program product stored on a trusted execution environment (TEE) and comprising at least one non-transitory computer-readable medium including program instructions that, when executed by at least one processor of the TEE, cause the at least one processor to:

• receive, from a first computer device associated with a first party, a first computation input and a first portion of a one-time key;
• receive, from a second computer device associated with a second party, a second computation input and a second portion of the one-time key;
• generate the one-time key based on the first portion of the one-time key and the second portion of the one-time key;
• execute a computation based on the first computation input and the second computation input;
• generate an encrypted output by encrypting the computation with the one-time key;
• communicate the encrypted output to the first computer device;
• receive a proof of publication from the first computer device, the proof of publication indicating that the following were published on a ledger accessible to the first computer device and the second computer device:
• (i) the first portion of the one-time key;
• and (ii) a digital signature of the second computer device indicating that the second computer device received the encrypted output;
• and
• in response to receiving the proof of publication, communicate the one-time key to the first computer device.

A computer-implemented method comprising:

• receiving, with at least one processor of a trusted execution environment (TEE), a first computation input and a first portion of a one-time key from a first computer device associated with a first party;
• receiving, with at least one processor of the TEE, a second computation input and a second portion of the one-time key from a second computer device associated with a second party;
• generating, with at least one processor of the TEE, the one-time key based on the first portion of the one-time key and the second portion of the one-time key;
• executing, with at least one processor of the TEE, a computation based on the first computation input and the second computation input;
• generating, with at least one processor of the TEE, an encrypted output by encrypting the computation with the one-time key;
• communicating, with at least one processor of the TEE, the encrypted output to the first computer device;
• receiving, with at least one processor of the TEE, a proof of publication from the first computer device, the proof of publication indicating that the following were published on a ledger accessible to the first computer device and the second computer device:
• (i) the first portion of the one-time key;
• and (ii) a digital signature of the second computer device indicating that the second computer device received the encrypted output;
• and
• in response to receiving the proof of publication, communicating, with at least one processor of the TEE, the one-time key to the first computer device.