Ancient and classic cipher methods and analysis tools implemented in .NET Standard 1.6.

Install-Package Science.Cryptography.Ciphers -Pre
Install-Package Science.Cryptography.Ciphers.Analysis -Pre

ICipher caesar = ShiftCipher.CreateCaesar(Alphabets.English);
string ciphertext = caesar.Encrypt("Hello world!");

Affine, Atbash, Autokey, Bacon, Beaufort, Bifid, Caesar, Four-square, Gronsfeld, Gudhayojya, Kama-Sutra, Monoalphabetic Substitution, Morse Code, Multiplicative, Null, ROT-13, ROT-47, Running Key, Sandorf's, Shift, Tap Code, Trithemius, Two-square, Variant Beaufort, Vatsyayana, Vigenère, XOR

IKeyedCipher<string> cipher = new RunningKeyCipher();
IEnumerable<char> ciphertextStream = cipher.Encrypt(plaintextStream);

Affine, Atbash, Monoalphabetic Substitution, Multiplicative, ROT-47, Running Key, Shift (Caesar, ROT-13), Vigenère

TabulaRecta tc = new TabulaRecta(Alphabets.English);

• Polybius Square
• Straddling Checkerboard
• Tabula Recta

IReadOnlyDictionary<int, string> result = CaesarBruteforce.Analyze(ciphertext);

• Caesar Bruteforce
• Entropy
• Frequency Analysis
• Kasiski Examination
• Key Finder
• Key space enumeration (Affine, Shift, Wordlist)
• N-Gram Analysis

• English
  • Relative frequencies of letters
  • Relative frequencies of first letters of words

• Encrypt and decrypt text
• Determine the cipher method for a given ciphertext
• How to choose between speculative plaintext candidates
• Decrypt ciphertext encrypted with an unkeyed cipher
• Find the key for a given ciphertext

• ADFGVX
• Columnar Transposition
• Enigma
• Hill
• Permutation
• Playfair
• Rail fence
• Myszkowski Transposition
• Nihilist
• One Time Pad
• Solitaire
• Trifid
• Any other missing cipher
• Unit tests