Abstract: Provided are a signature generation device, an authentication device, and a program that enable easy handling of electronic documents. A signature generation device 1 generates an electronic signature S to be imparted to an electronic document D of a user, and comprises: a document acquisition unit 11 that acquires the electronic document D; an instruction acquisition unit 12 that acquires a signature creation instruction with respect to the acquired electronic document D; a signature generation unit 14 that generates an encoded electronic signature S including time information M indicating the signature time and identification information identifying the user; and an imparting unit 15 that imparts, in a visibly recognizable manner, the generated electronic signature S to the electronic document D.

Abstract: The present invention provides a management device and a program with which it is possible to easily discriminate between the alteration and correction of an electronic document.