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 10 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
Classical ciphers. Data Structures and Algorithms Lab (University of Helsinki summer 2018).
java cipher algorithms ciphers frequency-analysis classical-cipher vigenere-cipher index-of-coincidence cipher-algorithms transposition-cipher classical-ciphers classical-cryptography double-transposition-cipher autokey-cipher keyed-cipher columnar-transposition-cipher columnar-transposition
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Jun 2, 2021 - Java
Program which cracks Vigenere cipher, for English cipher text
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Jun 14, 2019 - C#
cryptography cryptanalysis kasiski-method index-of-coincidence polyalphabetic-substitution vigenere-cipher-algorithm
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Mar 7, 2022 - Python
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
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
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