Examples of applying Kasiski examination and Index of Coincidence along with Frequency analysis to restore cryptographic key of Vigenere encypted ciphertext and decrypt it.
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Feb 4, 2024 - Python
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index-of-coincidence
Here are 11 public repositories matching this topic...
Cryptanalysis of Enigma M4 in Go Lang with pure statistical means utilizing Index of Coincidence and Trigram analysis.
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Apr 2, 2020 - Go
C[ryptographic Ana]lyzer
cryptography cpp qt5 cryptoanalysis frequency-analysis kasiski-method vigenere-cipher affine-cipher index-of-coincidence low-frequency-intervals
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Oct 4, 2015 - C++
Cryptography Algorithm Implementations
java cryptography hill-cipher frequency-analysis computer-security shift-cipher vigenere-cipher substitution-cipher affine-cipher index-of-coincidence classical-cryptography autokey-cipher lsfr-cipher permutation-cipher scytale-cipher kasiski-test
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Sep 26, 2018 - Java
In this project, we experiment with the use of diverse cryptographic algorithms. First, we attempt to encrypt a plaintext message using the Vigenère Algorithm and a fixed-length encryption key. Afterward, we experiment with the decryption of the produced cipher using Kasiski's Method, as well as the Index of Coincidence statistical test.
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Dec 2, 2024 - Jupyter Notebook
Program which cracks Vigenere cipher, for English cipher text
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Jun 14, 2019 - C#
hillclimbing attack on simple substitution ciphers
hill-climbing-search frequency-analysis substitution-cipher index-of-coincidence correlation-analysis digraphs
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Feb 25, 2024 - Fortran
cryptography cryptanalysis kasiski-method index-of-coincidence polyalphabetic-substitution vigenere-cipher-algorithm
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Mar 7, 2022 - Python
Automated cryptanalysis of the Vigenère cipher using Kasiski examination, Index of Coincidence (IC), and Mutual Index of Coincidence (MIC). Recovers keys (length ≤ 5) and decrypts ciphertexts into plaintext. Implemented in Python for cryptography and cybersecurity applications.
cryptanalysis frequency-analysis network-security vigenere-cipher index-of-coincidence classical-cryptography kasiski frequency-analysis-simulator
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Aug 23, 2025 - Python
Cryptanalyse automatique du chiffre de Vigenère par analyse statistique (indice de coïncidence, corrélations fréquentielles)
python cryptography cryptanalysis cipher statistical-analysis frequency-analysis caesar-cipher index-of-coincidence classical-cryptography vigenere-cipher-algorithm
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Apr 21, 2026 - Python
Browser-based Vigenère cipher demo — encrypt and decrypt with a repeating key, then recover the key length via Kasiski examination and index of coincidence and solve each column by frequency analysis. Real cryptanalysis. No backends. No simulated math.
cryptography cryptanalysis cipher vigenere frequency-analysis classical-cipher vigenere-cipher index-of-coincidence kasiski-examination polyalphabetic-cipher crypto-lab codebreaking historical-cryptography
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Aug 16, 2026 - TypeScript
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