Vigenere Cipher with reasonable key length

The ciphertext was generated with a Vigenere cipher, with a reasonable key length (<10).

Create a program in C, C++ or Python which takes the file as input, calculates the key length and decrypts the text.

Ideally the program is not heuristic, but automated, using the keylength attack and the

subsequent shift cipher attack from the lecture (both based on Index of Coincidence).

Use a reasonable threshold for the keylength attack to automate the program.

The text is too short for a successful Kasiski trigram attack..

Please add comments to the code.

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Compétences : Algorithme, Programmation C, Programmation C++, Cryptographie

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( 1 commentaire ) United States

Nº du projet : #9805667

12 freelance font une offre moyenne de $43 pour ce travail


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