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Bigram Table Generator

A program to generate random reciprocal bigram tables

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A command-line program to encrypt/decrypt a message using a random reciprocal bigram table and write a bigram table to a text file.

Executing the program without any command-line arguments starts bigram in message encryption/decryption mode. The program prompts for a password or passphrase and a message to encrypt/ decrypt. After the message is entered the ciphertext is displayed.

Executing the program with command-line arguments causes bigram to generate a random bigram table to print to screen or save to disk depending on whether the -f filename argument was given. If the -p passphrase argument is given a specific table is generated and is repeatable each time the same passphrase is given.

This program was written to supplement the Enigma Simulator by Dirk Rijmenants.
Enigma message procedures:

Bigram Table Generator Web Site


  • Command-Line operation
  • Message Encryption/Decryption
  • Display supression of passphrase and message entry
  • Prints tables to standard text files


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Additional Project Details

Intended Audience

Education, Advanced End Users, Security Professionals, Security

User Interface

Console/Terminal, Command-line

Programming Language



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