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'''Basic access control''' ('''BAC''') is a mechanism specified to ensure only authorized parties<ref>{{cite web |url=https://www.icao.int/publications/pages/publication.aspx?docnum=9303 |title=ICAO Document 9303, Part 1 |format=PDF |accessdate=2023-04-12 }}{{cbignore|bot=medic}}</ref> can wirelessly read personal information from [[passport]]s with an [[RFID]] chip. It uses data such as the passport number, date of birth and expiration date to negotiate a session key. This key can then be used to encrypt the communication between the passport's chip and a reading device. This mechanism is intended to ensure that the owner of a passport can decide who can read the electronic contents of the passport. This mechanism was first introduced into the German passport on 1 November 2005 and is now also used in many other countries (e.g., [[United States passport]]s since August 2007).<ref>[https://travel.state.gov/passport/eppt/eppt_2788.html#Eleven ] {{webarchive |url=https://web.archive.org/web/20071230072602/http://travel.state.gov/passport/eppt/eppt_2788.html#Eleven |date=December 30, 2007 }}</ref>
== Inner workings ==
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