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  2. Wiegand interface - Wikipedia

    en.wikipedia.org/wiki/Wiegand_interface

    Wiegand interface. The Wiegand interface is a de facto wiring standard which arose from the popularity of Wiegand effect card readers in the 1980s. It is commonly used to connect a card swipe mechanism to the rest of an access control system. The sensor in such a system is often a "Wiegand wire", based on the Wiegand effect, discovered by John ...

  3. Downloadable Conditional Access System - Wikipedia

    en.wikipedia.org/wiki/Downloadable_Conditional...

    DCAS System Diagram. DCAS, as envisioned, removed the need for physical set-top boxes or CableCARDs to protect encrypted digital content. It was proposed that instead of a card with removable circuitry, a custom ASIC chip could be soldered onto the circuitboard of any digital cable-ready device. DCAS software would then run on this custom chip.

  4. Direct memory access - Wikipedia

    en.wikipedia.org/wiki/Direct_memory_access

    Direct memory access (DMA) is a feature of computer systems that allows certain hardware subsystems to access main system memory independently of the central processing unit (CPU). [1] Without DMA, when the CPU is using programmed input/output , it is typically fully occupied for the entire duration of the read or write operation, and is thus ...

  5. Access control - Wikipedia

    en.wikipedia.org/wiki/Access_control

    A sailor checks an identification card (ID) before allowing a vehicle to enter a military installation. In physical security and information security, access control ( AC) is the selective restriction of access to a place or other resource, while access management describes the process. The act of accessing may mean consuming, entering, or ...

  6. Smart card - Wikipedia

    en.wikipedia.org/wiki/Smart_card

    A smart card ( SC ), chip card, or integrated circuit card ( ICC or IC card ), is a card used to control access to a resource. It is typically a plastic credit card-sized card with an embedded integrated circuit (IC) chip. [1] Many smart cards include a pattern of metal contacts to electrically connect to the internal chip.

  7. Keycard lock - Wikipedia

    en.wikipedia.org/wiki/Keycard_lock

    A keycard lock is a lock operated by a keycard, a flat, rectangular plastic card. The card typically, but not always, has identical dimensions to that of a credit card, that is ID-1 format. The card stores a physical or digital pattern that the door mechanism accepts before disengaging the lock. There are several common types of keycards in use ...

  8. Contactless smart card - Wikipedia

    en.wikipedia.org/wiki/Contactless_smart_card

    Contactless smart card. A contactless smart card is a contactless credential whose dimensions are credit card size. Its embedded integrated circuits can store (and sometimes process) data and communicate with a terminal via NFC. Commonplace uses include transit tickets, bank cards and passports. There are two broad categories of contactless ...

  9. Public key infrastructure - Wikipedia

    en.wikipedia.org/wiki/Public_key_infrastructure

    A public key infrastructure ( PKI) is a set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption. The purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network activities such as e ...

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