USER AUTHENTICATION SYSTEM, USER AUTHENTICATION METHOD AND NETWORK APPARATUS

1 . A user authentication system which carries out authentication at a user terminal via a network, comprising

an authentication page where permission of authentication is determined based on a consistency between an input password inputted from the user terminal and an authentication password, the authentication page including:

a private page URL key obtained by transforming a private page URL which the user terminal can connect via the network if it is determined that the authentication is permitted and an authentication password, using an encryption algorithm; and

a URL recovery processing code to find the private page URL by transforming the private page URL key and the input password through inverse transformation of the encryption algorithm,

wherein if it is determined that the authentication is permitted, the private page URL is acquired using the URL recovery processing code.

2 . The user authentication system according to claim 1 , wherein the authentication page information includes a password verification processing code to compare a password key obtained by transforming the authentication password based on a unidirectional function and a verification value obtained by transforming the input password through processing including the unidirectional function, and thus carry out authentication of password consistency.

3 . The user authentication system according to claim 2 , wherein the password key is calculated by finding a hash value of the authentication password and then transforming the hash value into a character string.

4 . The user authentication system according to claim 1 , wherein the private page key is calculated by generating a first character string including the password and a prescribed character string added thereto, then finding a hash value of the first character string, finding an exclusive OR of the private page URL and the hash value, and transforming the exclusive OR into a character string.

5 . The user authentication system according to claim 1 , wherein in the password authentication, a hash value of the input password is found and a value obtained by transforming the hash value into a character string is compared with the password key, and if the value matches the password key, a success is sent back, whereas if the value does not match the password key, a failure is sent back.

6 . The user authentication system according to claim 1 , wherein in the password authentication, a hash value of the input password is found and the hash value is compared with a value obtained by binarizing the password key, and if the values match, a success is sent back, whereas if the values do not match, a failure is sent back.

7 . The user authentication system according to claim 1 , wherein in the recovery of the private page URL based on the URL recovery processing code, a first character string including the input password and a prescribed character string added thereto is generated, a hash value of the first character string is found, a binary value of the URL key is found, and an exclusive OR of the hash value and the binary value is found, thereby acquiring a connection URL.

8 . A network apparatus which a user accesses via a network, carrying out password authentication at a user terminal, the network apparatus comprising:

a private page URL key obtained by transforming a private page URL which the user terminal can connect via the network if it is determined that the password authentication is permitted and the authentication password, using an encryption algorithm; and

a URL recovery processing code to find the private page URL by transforming the private page URL key and the input password through inverse transformation of the encryption algorithm.

9 . The network apparatus according to claim 8 , wherein the network apparatus outputs the private page URL key and the URL recovery processing code to the user terminal when the password authentication is carried out.

10 . A user authentication method comprising the steps of:

carrying out password authentication in which authentication is carried out based on a consistency between an input password inputted by a user at a user terminal and an authentication password, thus determining whether the authentication is successful or not;

generating a private page URL key obtained by transforming a private page URL which the user can connected via the network if it is determined that the authentication is permitted, and the authentication password, using an encryption algorithm; and

generating a URL recovery processing code to find the private page URL by transforming the private page URL key and the input password through inverse transformation of the encryption algorithm.

11 . The user authentication system, the network apparatus and the user authentication method according to claim 1 ,

wherein the inverse transformation of the encryption algorithm used to generate the private page URL key and the encryption algorithm used to find the private page URL is carried out based on a unidirectional function and an exclusive OR.

12 . The user authentication system, the network apparatus and the user authentication method according to claim 8 ,

wherein the inverse transformation of the encryption algorithm used to generate the private page URL key and the encryption algorithm used to find the private page URL is carried out based on a unidirectional function and an exclusive OR.

13 . The user authentication system, the network apparatus and the user authentication method according to claim 10 ,

wherein the inverse transformation of the encryption algorithm used to generate the private page URL key and the encryption algorithm used to find the private page URL is carried out based on a unidirectional function and an exclusive OR.