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Decrypt messages encrypted with a substitution cipher
...Ciphertext can be modified at any point of the
process.
• Easy location of corresponding characters in the ciphertext and the substituted text
by selection.
• Fast frequencyanalysis for single letters, bigrams, trigrams and quadgrams (more
N -grams can be made available by adding a single line of code).
• Showing the most common letters (bi-/trigrams) in the ciphertext compared to the
most common letters (bi-/trigrams) in the British English language.
• Easy assignment and change of the substitution letters...
this simple program implements the Vigenere cipher in python
For details of this cipher see;
http://en.wikipedia.org/wiki/Vigenere_cipher
This cipher can be broken by frequencyanalysis, this is a toy project, and should not be used in situations where security is important.
CryptoHelper is a Java program designed to aid in the decryption of classical ciphers, ie pre WWII ciphers. It brings together tools like frequencyanalysis, friedman tests, enciphering/deciphering for several clasical ciphers, and brute force algorithm