person alleged to have signed or written document produced.— If a document is alleged to be signed or to have been written wholly or in part by any person, the signature or the handwriting of so much of the document as is alleged to be in that person’s handwriting must be proved to be in his handwriting. 1 [78-A. Proof of electronic signature and electronic document.— If an electronic document is alleged to be signed or to have been generated wholly or in part by any person through the use of an information system, and where such allegation is denied, the application of a security procedure to the signature or the electronic document must be proved.]