Apply VSS for Visual Authentication through Internet ( “A dynamic password visual authentication scheme through Internet,” ITS'98, , vol.III pp.163-167, 1998, Taipei.)

Internet

WWW

Server

a random image

correct password

send a random image each time when user login

a key image stored in disk

RESPONSE

CHALLENGE

1 2 3 4 5

DYNAMIC PASSWORD :

the password is different each time

1st 1 2 3 4 5

2nd 2 4 4 7 5

3rd 5 8 0 5 8