1. A method of encoding user data within a signature field of an electronic document comprising: receiving, with one or more processors, user data captured as a user enters a signature gesture, the user data comprising a plurality of sample points, each sample Point comprising position data and temporal data; verifying the signature gesture entered by the user by comparing behaviometric information derived from said user data, and comparing this information with pre-stored behaviometric templates to determine the identity of the user and determining a verification result; generating, with the one or more processors, a digital image for incorporation into the signature field of the electronic document, the digital image comprising a plurality of pixels, each pixel comprising a first byte value representing a red component, a second byte value representing a blue component, and a third byte value representing a green component; encoding, with the one or more processors, the user data within one or more pixels of the digital image by performing a reversible binary operation with a first operand that includes a binary representation of a selected portion of the user data and with a second operand that includes one or more bytes selected from the red component, the blue component, or the green component of one or more pixels of the digital image; encoding, with the one or more processors, the verification result within one or more pixels of the digital image; and inserting with the one or more processors, the digital image within the signature field of the electronic document.