TITLEApplication of DES

in ATM

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.

ATM COMMUNICATION SECURITY

• ATMs contain secure crypto-processors• Relies mostly on the integrity of the secure crypto-processor.• 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

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.

USE OF DES

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.

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.

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