The service of digital signature is created as electronical information system that be aimed to supporting identification by online method ?s. The digital signature does not same as conventional model which then be migrated into digitized image and as like signature that 's wrote at hard wore which is on touch screen base. The digital signature be resulted of encryption process to electronic models which has been done in mathematical or electronica! base and been sent by hard ware connection to any cyberspace network. This approach also runs to particular purpose as reflection of approval beside to protecting towards substance of document and archive of substance changing done. The author explains in the Indonesian legal circumstance's for further implication the topic submitted here in the related legal aspects on the role and junction of signature digital service, corporate document, ana' consumer protection.