User authentication method and authentication system using match with junk data

A user authentication system using junk data matching, the system comprising:

• an input unit receiving a password and junk data from a user;
• a storage unit storing instructions to be executed by a processor;
• and
• the processor sequentially executing the instructions loaded on the storage unit,
• wherein the processor, if receiving a password comprising junk data from a user where the junk data are comprised before, after, or before and after the password, extracts the password excluding the junk data from the received password comprising the junk data, and processes user authentication as a failure even though the extracted password matches a previously stored password in the storage unit when the password comprising the junk data matches, by a critical length, the previously stored password comprising junk data inputted in the past.

A user authentication system using junk data matching, the system comprising:

• a communication adapter transmitting and receiving data through a network;
• a storage unit storing instructions to be executed by a processor;
• and
• the processor sequentially executing the instructions loaded on the storage unit,
• wherein the communication adapter receives a password comprising junk data from a remote terminal connected through the network where the junk data are comprised before, after, or before and after the password, and
• the processor extracts the password excluding the junk data from the received password comprising the junk data, and processes user authentication as a failure even though the extracted password matches a previously stored password in the storage unit when the password comprising the junk data matches, by a critical length, the previously stored password comprising junk data inputted in the past.