https://github.com/madhurimarawat/cryptography-and-network-security

This repository contains Cryptography programs in the Python programming language.
https://github.com/madhurimarawat/cryptography-and-network-security

caesar-cipher-algorithm python rail-fence-cipher

Last synced: 7 months ago
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This repository contains Cryptography programs in the Python programming language.

• Host: GitHub
• URL: https://github.com/madhurimarawat/cryptography-and-network-security
• Owner: madhurimarawat
• Created: 2023-09-19T15:09:17.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2024-01-21T12:03:38.000Z (over 1 year ago)
• Last Synced: 2025-01-15T01:16:52.091Z (9 months ago)
• Topics: caesar-cipher-algorithm, python, rail-fence-cipher
• Language: Python
• Homepage:
• Size: 5.86 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Cryptography-and-Network-Security

This repository contains Cryptography programs in the Python programming language.

## Cryptography:

- **Definition:**

  - Cryptography is the practice and study of techniques for securing communication and information from adversaries.

- **Objectives:**

  - Ensure confidentiality, integrity, and authenticity of information.

  - Provide secure communication in the presence of malicious third parties.

- **Types of Cryptography:**

  - Symmetric Key Cryptography (uses a single key for both encryption and decryption).

  - Asymmetric Key Cryptography (uses a pair of public and private keys).

- **Applications:**

  - Used in securing online transactions (e.g., HTTPS).

  - Protects sensitive data in storage and transmission.

- **Challenges:**

  - Continuous need for stronger algorithms due to advancements in computing power.

  - Balancing security and usability in real-world applications.

### Caesar Cipher:

- **Algorithm:**

  - Substitution cipher where each letter in the plaintext is shifted a certain number of places down or up the alphabet.

- **Key Concept:**

  - Key represents the number of positions each letter of the alphabet is shifted.

- **Weakness:**

  - Vulnerable to brute-force attacks due to a limited number of possible keys (26 in the case of the English alphabet).

- **Encryption Example:**

  - Plain text: "HELLO"

  - Key: 3

  - Cipher text: "KHOOR"

- **History:**

  - Named after Julius Caesar, who is believed to have used it for military communication.

### Rail Fence Cipher:

- **Algorithm:**

  - Transposition cipher where the plaintext is written in a zigzag pattern on a set of rails.

- **Key Concept:**

  - Key represents the number of rails (rows) used in the encryption process.

- **Encryption Example:**

  - Plain text: "HELLO"

  - Key: 3

  - Cipher text: "HOLELW"

- **Decryption:**

  - Reconstruct the zigzag pattern and read off the message.

- **Usage:**

  - Historical use in non-secure communication due to its simplicity.

  - Rarely used for serious encryption today, more of a puzzle or educational tool.