physical
问题In the fields of physical security and information security,access control is the selectiv
Inthefieldsofphysicalsecurityandinformationsecurity,accesscontrolistheselectiverestricti
问题An（），serving a function similar to a physical wallet, holds credit card numbers,electroru
An（），servingafunctionsimilartoaphysicalwallet,holdscreditcardnumbers,electroruccash,owne