METHOD AND SYSTEM FOR NON-MALLEABLE AND NON-INTERACTIVE CRYPTOGRAPHIC COMMITMENT IN A NETWORK

A method and system perform non-malleable and non-interactive commitment of data, which is communicated by a sender to a receiver. At a commitment phase, the sender selects a first string having a first portion and a second portion, and based on the first portion of the first string, establishes a first commitment to an authentication key. The sender divides the second portion of the first string into a set of segments each including two or more sub-segments, and based on the first commitment, selects one of the subsegments in each of the segments. The sender combines the selected sub-segments together, and establishes a second commitment to the data based on the combined selected sub-segments such that the second commitment is equivocable. The sender authenticates the second commitment by using the authenticating key. At a de-commitment phase, the sender de-commits the data and the authentication key.