However, ATM machines are becoming more complicated, and they serve numerous functions, thus becoming a high priority target to robbers and hackers.
Modern ATM machines are implemented with high-security protection measures.
As an alternative, unskilled robbers threaten bank patrons with a weapon to loot their withdrawn money or account.
Main Article: ATM Fraud ATM vandals can either physically tamper with the ATM machine to obtain cash, or employ credit card skimming methods to acquire control of the user's credit card account.
The alternative way to credit card fraud is to identify the PIN directly with devices such as cameras concealed near the keypad.
They work under complex systems and networks to perform transactions.
The data processed by ATMs are usually encrypted, but hackers can employ discreet hacking devices to hack accounts and withdraw the account's balance.
As the number of ATM units increase, the machines are prone to hacker attacks, fraud, robberies and security breaches.
In the past, the ATM machines' main purpose was to deliver cash in the form of bank notes and to debit a corresponding bank account.A condition for off-line PIN validation is that the ATM should be able to compare the customer's entered PIN against the PIN of reference.