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| Shodan (website) ： ウィキペディア英語版 |
Shodan (website)
Shodan is a search engine that lets the user find specific types of computers (routers, servers, etc.) connected to the internet using a variety of filters. Some have also described it as a search engine of service banners, which are meta-data the server sends back to the client.〔(【引用サイトリンク】title=SHODAN Help )〕 This can be information about the server software, what options the service supports, a welcome message or anything else that the client can find out before interacting with the server.
Shodan collects data mostly on web servers at the moment (HTTP port 80), but there is also some data from FTP (21), SSH (22) Telnet (23), SNMP (161) and SIP (5060) services.〔(【引用サイトリンク】title=SHODAN FAQ )〕
It was launched in 2009 by computer programmer John Matherly, who, in 2003, conceived the idea of searching devices linked to the Internet. The name Shodan is a reference to SHODAN, a character from the ''System Shock'' video game series.〔
==Background==
The website began as Matherly's pet project, based on the fact that large numbers of devices and computer systems are connected to the Internet. Shodan users are able to find systems including traffic lights, security cameras, home heating systems as well as control systems for water parks, gas stations, water plants, power grids, nuclear power plants and particle-accelerating cyclotrons; most have little security.〔 Many devices use "admin" as their user name and "1234" as their password, and the only software required to connect them is a web browser.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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