What is feistel cipher? l low it works in a cryptographic algorithm?

Subject Computer and Network Security
NU Year Set: 4.(a) Marks: 2+5=7 Year: 2017

In cryptography, a Feistel cipher is a symmetric structure used in the construction of block ciphers, named after the German-born physicist and cryptographer Horst Feistel who did pioneering research while working for IBM (USA); it is also commonly known as a Feistel network.

Often cryptographic algorithms and protocols are necessary to keep a system secure, particularly when communicating through an untrusted network such as the Internet. Where possible, use cryptographic techniques to authenticate information and keep the information private (but don’t assume that simple encryption automatically authenticates as well). Generally, you’ll need to use a suite of available tools to secure your application.

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