Abstract: Disclosed is a user authentication method including at least: (1) performing a primary conversion to generate a first common authentication key and performing a secondary conversion to provide an encrypted first common authentication key, and registering the encrypted first common authentication key; (2) generating a first server authentication key, and performing an OTP operation on the first server authentication key to generate first server authentication information; (3) performing a primary conversion to generate a second common authentication key, performing a secondary conversion to generate an encrypted second common authentication key, generating a first user authentication key, and performing an OTP operation on the first user authentication key to generate first user authentication information; and (4) performing a user authentication or an authentication of the authentication server for determining a genuineness of the authentication server, based on coincidence of the first server authentication

Abstract: Disclosed is a user authentication method including at least: (1) performing a primary conversion to generate a first common authentication key and performing a secondary conversion to provide an encrypted first common authentication key, and registering the encrypted first common authentication key; (2) generating a first server authentication key, and performing an OTP operation on the first server authentication key to generate first server authentication information; (3) performing a primary conversion to generate a second common authentication key, performing a secondary conversion to generate an encrypted second common authentication key, generating a first user authentication key, and performing an OTP operation on the first user authentication key to generate first user authentication information; and (4) performing a user authentication or an authentication of the authentication server for determining a genuineness of the authentication server, based on coincidence of the first server authentication

Abstract: A user authentication method with enhanced security is provided. The method includes generating a first common authentication key if a user of the user terminal enters a private password and providing the generated first common authentication key to an authentication server, registering the first common authentication key and user information by matching the first common authentication key with the user information, generating a second common authentication key in real time if the user enters the private password, generating a server authentication key, generating first server authentication information by calculating a one time password (OTP) by using the server authentication key as an operation key, generating a user authentication key, generating first user authentication information by calculating an OTP by using the user authentication key as an operation key, and performing user authentication based on whether the first server authentication is identical to the first user authentication.

Abstract: A user authentication method with enhanced security is provided. The method includes generating a first common authentication key if a user of the user terminal enters a private password and providing the generated first common authentication key to an authentication server, registering the first common authentication key and user information by matching the first common authentication key with the user information, generating a second common authentication key in real time if the user enters the private password, generating a server authentication key, generating first server authentication information by calculating a one time password (OTP) by using the server authentication key as an operation key, generating a user authentication key, generating first user authentication information by calculating an OTP by using the user authentication key as an operation key, and performing user authentication based on whether the first server authentication is identical to the first user authentication.

Abstract: There are disclosed a system and method for preventing the leaking of digital content. The system for preventing the leaking of digital content may include a digital content layer generation unit for generating a digital content layer displaying digital content, a security layer generation unit for generating a security layer including security information based on information about a user terminal, and an information display unit for displaying the security layer generated by the security layer generation unit and the digital content layer generated by the digital content layer generation unit in the display device of the user terminal in an overlapping form so that the security information looks like overlapping with the digital content. Accordingly, the illegal leaking of digital content through photographing or screen capture can be prevented.

Abstract: There are disclosed a system and method for preventing the leaking of digital content. The system for preventing the leaking of digital content may include a digital content layer generation unit for generating a digital content layer displaying digital content, a security layer generation unit for generating a security layer including security information based on information about a user terminal, and an information display unit for displaying the security layer generated by the security layer generation unit and the digital content layer generated by the digital content layer generation unit in the display device of the user terminal in an overlapping form so that the security information looks like overlapping with the digital content. Accordingly, the illegal leaking of digital content through photographing or screen capture can be prevented.