The Common Access Card (CAC) contains certificates that support: a. Identification
b. Encryption
c. Digital Signatures
d. All of the above
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Multifactor Authentication
A CAC, or Common Access Card Reader can be used to read cards such as credit cards, and can be used for the customer to enter their PIN. These are normally found in shops, supermarkets, and banks.
15-character password
Card access systems are not common for homes. Generally people install a keypad with a security code attached so that no card is required. You can read about card access at http://www.transalarm.com/national_accounts/card_access_systems.cfm.
Common access cards are identification cards mainly used for allowing physical access into buildings or other controlled areas. It is also used to access computer workstations, networks, and systems. It is designed to provide two-factor authentication: the physical card and the PIN.