Encrypting method based on two-dimensional codes as well as encrypting device and information system

The invention provides an encrypting method based on two-dimensional codes. The encrypting method comprises the following steps of: generating and storing identity recognition two-dimensional codes when receiving registration requests from users, wherein the identity recognition two-dimensional codes correspond to the users one to one; defecting the identity recognition two-dimensional codes submitted by the users after detecting login requests from the users; and judging whether the received identity recognition two-dimensional codes from the users are identical to the pre-stored identity recognition two-dimensional codes of the users or not, and if so, prompting the users of setting new login passwords. According to the encrypting method, the problem related to user identity recognition in password resetting is solved by means of using the two-dimensional codes generated in user registration, the experience of the users is improved, and the encrypting method has high efficiency and usability. The invention also discloses an information system and an encrypting device based on the two-dimensional codes.