Novel tools and techniques are provided for implementing signal encryption or signal authentication. In various embodiments, a second computing system might pack, using a packing function, two or more elements of a second vector associated with a third entity to generate a packed second vector; might individually encrypt, using a generated public key received from a first computing system, each element of the packed second vector to generate an encrypted packed second vector; might pack two or more elements of an encrypted first vector from the first computing system to generate a packed encrypted first vector; might combine the encrypted packed second vector with the packed encrypted first vector to generate a combined packed encrypted vector; and might send the combined packed encrypted vector to the first computing system for generating a similarity score that is indicative of differences between the second vector and the first vector.