Under Federal Law on digital e-signature №1-FZ dated 10.01.2002, parties interchanging e-documents shall enter an agreement on admission of digital e-signature equal to handwritten signature and stamp on a paper source. Parties can enter such an agreement on their own (for example as a part of contract) or access to public agreement (such as Rules) issued by the information system provider where they are going to interchange e-documents.
Diadoc Rules, you can access to filling in application form, states such equivalence. So digital e-signature on e-document transmitted via Diadoc equate to handwritten signature of an authorized person and the stamp.