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Data Encryption Standard (DES)

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Questions and Answers

What was the basis for the Data Encryption Standard (DES)?

A custom-built cipher developed by the U.S. government

The IBM Lucifer cipher (correct)

An open-source encryption project

A combination of existing encryption algorithms

What was a controversy surrounding the development of the Data Encryption Standard (DES)?

The development process was too slow

The key length was too long

The algorithm was too complex to implement

The NSA was secretly involved and influenced the design (correct)

Why was the design process of the Data Encryption Standard (DES) criticized?

It was not open to the public and lacked transparency (correct)

It was too slow and took too long

It was too complex and required specialized knowledge

It was too open to public scrutiny

What change was made to the Lucifer algorithm during the development of the Data Encryption Standard (DES)?

Subtle changes were made to the algorithm Signup and view all the answers

What was reduced during the development of the Data Encryption Standard (DES)?

The key length Signup and view all the answers

What is the block length of the DES Feistel cipher?

64 bits Signup and view all the answers

How many rounds are used in the DES algorithm?

16 rounds Signup and view all the answers

What is the length of the key used in each round of the DES algorithm?

48 bits Signup and view all the answers

What is the primary security component of the DES algorithm?

S-boxes Signup and view all the answers

What is the mapping performed by each S-box in the DES algorithm?

Maps 6 bits to 4 bits Signup and view all the answers

Study Notes

Data Encryption Standard (DES)

Developed in the 1970s
Based on the IBM Lucifer cipher
Became a U.S. government standard
Development was controversial due to secret involvement of the National Security Agency (NSA)
Design process was not open to the public
Key length was reduced, potentially compromising security
Subtle changes were made to the original Lucifer algorithm

DES Numerology

DES is a type of Feistel cipher
Block length of DES is 64 bits
Key length of DES is 56 bits
DES operates for 16 rounds
In each round, 48 bits of the key are used (subkey)
Each round of DES is relatively simple for a block cipher

Security of DES

Security of DES primarily depends on "S-boxes"
Each S-box in DES maps 6 bits of input to 4 bits of output

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Description

This quiz covers the development and controversy surrounding the Data Encryption Standard (DES), a encryption algorithm developed in the 1970s. Learn about the involvement of the NSA and the design process.