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"ATM machine" is a common example of RAS syndrome. RAS syndrome, where RAS stands for redundant acronym syndrome (making the phrase "RAS syndrome" autological), is the redundant use of one or more of the words that make up an acronym in conjunction with the abbreviated form. This means, in effect, repeating one or more words from the acronym.
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There are different transaction methods used in shared ATMs with regards to the encipherment of PIN, and message authentication among them is so-called "zone encryption". In this method, a trusted authority is appointed to operate on behalf of a group of banks so they could interchange messages for ATM payment approvals. [1]
November 2015) (Learn how and when to remove this message) ISO/IEC 7813 is an international standard codified by the International Organization for Standardization and International Electrotechnical Commission that defines properties of financial transaction cards, such as ATM or credit cards .
ATM Adaptation Layer 5 (AAL5) is an ATM adaptation layer used to send variable-length packets up to 65,535 octets in size across an Asynchronous Transfer Mode (ATM) network. Unlike most network frames, which place control information in the header , AAL5 places control information in an 8-octet trailer at the end of the packet.
CRCs are so called because the check (data verification) value is a redundancy (it expands the message without adding information) and the algorithm is based on cyclic codes. CRCs are popular because they are simple to implement in binary hardware , easy to analyze mathematically, and particularly good at detecting common errors caused by noise ...
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For example, if a customer of Bank A used their card at an ATM belonging to Bank B, the message would be forwarded to Bank B's ATMC. The ATMC would examine the message, and based upon the account number determine that the appropriate ATMC to contact would be Bank A. It would then forward the message to Bank A's ATMC for authorisation.