門禁管理系統(tǒng)原理外文翻譯(含原文)-管理系統(tǒng)(編輯修改稿)
2025-02-24 01:24 本頁面
【文章內(nèi)容簡介】 through keys and locks. When a door is locked only someone with a key can enter through the door depending on how the lock is configured. Mechanical locks and keys do not allow restriction of the key holder to specific times or dates. Mechanical locks and keys do not provide records of the key used on any specific door and the keys can be easily copied or transferred to an unauthorized person. When a mechanical key is lost or the key holder is no longer authorized to use the protected area, the locks must be rekeyed. Electronic access control uses puters to solve the limitations of mechanical locks and keys. A wide range of credentials can be used to replace mechanical keys. The electronic access control system grants access based on the credential presented. When access is granted, the door is unlocked for a predetermined time and the transaction is recorded. When access is refused, the door remains locked and the attempted access is recorded. The system will also monitor the door and alarm if the door is forced open or held open too long after being unlocked. When a credential is presented to a reader, the reader sends the credential’s information, usually a number, to a control panel, a highly reliable processor. The control panel pares the credential39。s number to an access control list, grants or denies the presented request, and sends a transaction log to a database. When access is denied based on the access control list, the door remains locked. If there is a match between the credential and the access control list, the control panel operates a relay that in turn unlocks the door. The control panel also ignores a door open signal to prevent an alarm. Often the reader provides feedback, such as a flashing red LED for an access denied and a flashing green LED for an access granted .The above description illustrates a single factor transaction. Credentials can be passed around, thus subverting the access control list. For example, Alice has access rights to the server room but Bob does not. Alice either gives Bob her credential or Bob takes it。 he now has access to the server room. To prevent this, twofactor authenticationcan be used. In a two factor transaction, the presented credential and a second factor are needed for access to be granted。 another factor can be a PIN, a second credential, operator intervention, or a biometric input. There are three types (factors) of authenticating information : ? something the user knows, ega password, passphrase or PIN ? something the user has, such as smart card ? something the user is, such as fingerprint, verified by biometric measurement. Passwords are a mon means of verifying a user39。s identity before access is given to information systems. In addition, a fourth factor of authentication is now recognized: someone you know, where another person who knows you can provide a human element of authentication in situations where systems have been set up to allow for such scenarios. For example, a user may have their password, but have fotten their smart card. In such a scenario, if the user is known to designated cohorts, the cohorts may provide their smart card and password in bination with the extant factor of the user in question and thus provide two factors for the user with missing credential, and three factors overall to allow access. Now, as people39。s living standards improve and technology advances, more and more local needs of access control system such as residential entrance, garage entrance, the entrance and other public places. Many different types of access control system。 because it has different characteristics, so do not use the place, IC card access control system because of its higher security, better convenience and costeffective access control system into the mainstream.
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