This document discusses the application of the Data Encryption Standard (DES) in securing ATM transactions. It provides background on how ATMs operate and rely on encryption to securely transmit financial information. DES was developed in the 1970s and uses a 56-bit key to encrypt 64-bit blocks of data. The document outlines the advantages of DES for ATM security, such as its convenience and cost-effectiveness, but also notes disadvantages like its limited key size making it possible to break with advancing technology. It concludes that while ATMs provide a secure banking method, their security requires improving to keep up with threats and recommends upgrading from DES to more advanced standards.

1. TITLE
Application of
DES in ATM

2. INTRODUCTION
• ATM also known as Automatic Teller Machine is a
simple and yet security banking service.
• Allows an authorized cardholder to conduct banking
transaction without visiting a branch.
• They are well known for its convenience to the
customers, cost-effectiveness to the bank and most
importantly it is an extremely secure banking method.
• ATMs rely on authorization of a transaction by the bank
via a secure communications network.
• Encryption methods are built into the communication
network to prevent unauthorized transactions.

3. ATM COMMUNICATION SECURITY
• ATMs contain secure crypto-processors
• Relies mostly on the integrity of the secure cryptoprocessor.
• ATMs typically connect directly to their ATM Transaction
Processor via a modem over a dedicated telephone line.
• Account number: 8807012345691715
• PIN key: FEFEFEFEFEFEFEFE
• Result of DES: A2CE126C69AEC82D
• Result decimalized: 0224126269042823
• Natural PIN: 0224
• Offset: 6565
• Customer PIN: 6789

4. DATA ENCRYPTION STANDARD
• (DES) was developed by an IBM team around 1974 and
adopted as a national standard in 1977.
• An approved cryptographic algorithm selected as an official
Federal Information Processing Standard (FIPS) for the
United States (Lockergnome Encyclopedia, 2004).
• Encryption is the transformation of data to a form which is
impossible to read without the appropriate knowledge or
key.
• In DES, data are encrypted in 64-bit blocks using a 56-bit
key.
• DES Modes of Operation describes four different modes for
using the algorithm described in this standard. -(ECB) (CBC)
(CFB) (OFB) mode.

5. USE OF DES

6. ADVANTAGES OF DES
•
•
•
•
Convenient
Cost-effective
Secure banking method
No real weaknesses have been found: the most
efficient attack is still brute force.
• The Government is required to re-certify, DES
every five years and ask it be replaced if
necessary.
• Anybody can learn the details and implement it.
• Fast in hardware and relatively fast in software.

7. DISADVANTAGES OF DES
• DES is so easy to break with today’s rapidly
advancing technology.
• Limited size of key.
• Hardware implementations of DES are very
fast; DES was not designed for software and
hence runs relatively slowly.
• We cannot get the readable data at the
receiving end.

8. CONCLUSION
• Automatic Teller Machines are protected by
advanced encryption technologies.
• ATM security requires improving methods to
keep up with smart intruders.
• Upgrade from the Data Encryption Standard to
the Advanced Encryption Standard
• ATMs are very convenient, cost-effective and
secure banking method provided to customers
today