Developed a tool for cracking one-time pad encryption by leveraging letter frequency analysis to identify potential vulnerabilities. The tool performs decryption by analyzing the frequency distribution of letters in the encrypted text, allowing for the extraction of plaintext from ciphertext.
What I delivered:
- Decryption Tool:
- Text Processing:
- Frequency Analysis:
- Code Implementation:
- Output and Validation:
Result: Production-tested tool, documented install, and revisions until the client workflow was stable.
Overview
Developed a tool for cracking one-time pad encryption by leveraging letter frequency analysis to identify potential vulnerabilities. The tool performs decryption by analyzing the frequency distribution of letters in the encrypted text, allowing for the extraction of plaintext from ciphertext.
Key Features & Responsibilities:
- Decryption Tool:
- Developed a Python-based tool to crack one-time pad encryption using letter frequency analysis.
- Implemented functionality to process and analyze encrypted text for decryption.
- Text Processing:
- Converted encrypted binary data into human-readable text using custom functions.
- Included functions to handle text conversion from bits and byte operations to enable decryption.
- User Interface:
- Created a command-line interface for users to input encrypted data and receive decrypted output.
- Included prompts and instructions to guide users through the decryption process.
- Frequency Analysis:
- Applied letter frequency analysis to identify common patterns and potential key candidates.
- Developed algorithms to analyze the distribution of letters in the encrypted text to aid in decrypting the one-time pad.
- Code Implementation:
- Used Python libraries such as collections.Counter for frequency analysis and binascii for binary-to-text conversions.
- Implemented custom functions to handle binary data, such as text_from_bits and int2bytes.
- Output and Validation:
- Provided decrypted text as output, which users can validate against known plaintexts or further analyze.
- Ensured the tool handles varying lengths and formats of encrypted data.