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# Symmetric Encryption Methods Quiz

Created by
@GlimmeringSpring

8-bits

2

P10

### How many bits does the key consist of in Simplified DES?

<p>10-bits</p> Signup and view all the answers

### What is the size of the output (ciphertext) block in Simplified DES?

<p>8</p> Signup and view all the answers

## Study Notes

• The lesson is about Symmetric Encryption, specifically Stream Ciphers and the Simplified DES algorithm.
• Stream Ciphers and Block Ciphers are two main types of encryption, Stream Ciphers encrypt bits individually, and Block Ciphers encrypt full blocks of bits.
• Stream Ciphers have simple encryption and decryption functions, which consist of additions modulo 2(XOR).
• Security for Stream Ciphers depends entirely on the key stream si, and it must be reproducible by both sender and receiver.
• Two main types of Stream Ciphers are Synchronous and Asynchronous. Synchronous Stream Cipher has a random key stream, while Asynchronous Stream Cipher depends on the ciphertext.
• Simplified DES is a symmetric encryption algorithm, with an 8-bit input(plaintext), 8-bit output(ciphertext), and a 10-bit key.
• Simplified DES has two rounds, and each round uses permutations and left shifts to generate round keys.
• The S-Box is a significant component of DES, used for substitutions. It functions as a matrix, and its output depends on the input's first and last bits.
• Simplified DES key generation uses specific permutations (P10 and P8) and the First and Final Permutations to encrypt and decrypt the data.
• The first permutation, Initial Permutation, mixes up the input's 8 bits.
• Simplified DES encryption includes the Initial Permutation, Round Function, and Switch Halves.
• Simplified DES decryption is similar to encryption, except it uses round keys in the opposite order.

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## Description

Test your knowledge on symmetric encryption methods with this quiz. Topics covered include Stream Cipher vs. Block Cipher, encryption and decryption processes with Stream Ciphers, and S-DES cipher.

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