public void DecryptWithNullTest()
{
const string ciphertext = "abbaba";
var cipher = new SimpleSubstitutionCipher(new Alphabet("ab"));
cipher.Decrypt(ciphertext, null);
}
public void DecryptNullTest()
{
var key = new SimpleSubstitutionKey(("ab", "ba"));
var cipher = new SimpleSubstitutionCipher(new Alphabet("ab"));
cipher.Decrypt(null, key);
}
public void DecryptWrongKeyTest3()
{
var key = new SimpleSubstitutionKey(("abcd", "badc"));
const string ciphertext = "aacabc";
var cipher = new SimpleSubstitutionCipher(new Alphabet("abc"));
cipher.Decrypt(ciphertext, key);
}
public void DecryptTest()
{
var key = new SimpleSubstitutionKey(("ab", "ba"));
const string plaintext = "abbaba";
const string ciphertext = "baabab";
var cipher = new SimpleSubstitutionCipher(new Alphabet("ab"));
Assert.AreEqual(plaintext, cipher.Decrypt(ciphertext, key));
}
public void AbsorbtionTest()
{
var encKey = new SimpleSubstitutionKey(("abc", "bca"));
var decKey = KeyGenerator.GetSimpleSubstitutionDecryptionKey(encKey);
const string plaintext = "abcbabca";
var cipher = new SimpleSubstitutionCipher(new Alphabet("abc"));
Assert.AreEqual(
plaintext,
cipher.Decrypt(cipher.Encrypt(plaintext, encKey), decKey));
}
public void DecryptWrongTextTest()
{
var key = new SimpleSubstitutionKey(("ab", "ba"));
const string ciphertext = "aacabc";
var cipher = new SimpleSubstitutionCipher(new Alphabet("ab"))
{
IsStrict = false
};
Assert.AreEqual("bbcbac", cipher.Decrypt(ciphertext, key));
}
public void DecryptWrongTextStrictTest()
{
var key = new SimpleSubstitutionKey(("ab", "ba"));
const string ciphertext = "aacabc";
var cipher = new SimpleSubstitutionCipher(new Alphabet("ab"))
{
IsStrict = true
};
cipher.Decrypt(ciphertext, key);
}
public string Decrypt(string cipherText)
{
string plainText = cipherText;
SimpleSubstitutionCipher simpleSubstitutionCipher = new SimpleSubstitutionCipher();
simpleSubstitutionCipher.SetKey(SIMPLE_SUBSTITUTION_CIPHER_KEY);
plainText = simpleSubstitutionCipher.Decrypt(plainText);
AffineCipher affineCipher = new AffineCipher();
affineCipher.SetKeys(new int[] { AFFINE_CIPHER_KEY_A, AFFINE_CIPHER_KEY_B });
plainText = affineCipher.Decrypt(plainText);
CaesarCipher caesarCipher = new CaesarCipher();
caesarCipher.SetKey(CAESAR_CIPHER_KEY);
plainText = caesarCipher.Decrypt(plainText);
return(plainText);
}
