Systems and method for sending a first alphacode to a first participant over a secure channel. Sending a second alphacode to a second participant over a secure channel. Receiving a first encoded message, a second encoded message, and a plaintext message. The first encoded message is based on the first alphacode and the second encoded message is based on the second alphacode. Generating a first ciphertext based on the first alphacode and the plaintext message. Comparing the first ciphertext to the first encoded message and determining the authenticity of the first encoded message based at least on the comparing to the first ciphertext. Comparing the second ciphertext to the second encoded message and determining the authenticity of the second encoded message based at least on the comparing to the second ciphertext. Sending a first confirmation to the first participant and sending a second confirmation to the second participant.