AUTHENTICATION SERVER AND AUTHENTICATION METHOD BY AUTHENTICATION SERVER

摘要

The purpose of this first invention is to provide an authentication server capable of securely and accurately determining whether an access source is a portable phone or a computer when the browsing of contents is limited to portable phone users. This first invention is an authentication server (1) characterized by being provided with a transmission delay time measurement unit (13) which measures the transmission delay time between the authentication server (1) and a communication terminal (2) multiple times, a transmission delay time distribution characteristic determination unit (14) which determines whether the distribution characteristic of the transmission delay time measured multiple times is discrete, and a content browsing authentication unit (15) which recognizes the communication terminal (2) to be a wireless communication terminal and approves browsing when it is determined that the distribution characteristic of the transmission delay time is discrete and recognizes the communication terminal (2) to be a wired communication terminal and denies the browsing when it is determined that the distribution characteristic of the transmission delay time is not discrete.