public void DecryptNullTest()
{
var key = new Key <string>("ABCD");
var cipher = new VisenereCipher(new Alphabet("ABCD"));
cipher.Decrypt(null, key);
}
public void DecryptWrongKeyTest()
{
var key = new Key <string>("abc");
const string ciphertext = "aabab";
var cipher = new VisenereCipher(new Alphabet("ab"));
cipher.Decrypt(ciphertext, key);
}
public void DecryptTest()
{
const string plaintext = "CRYPTOISSHORTFORCRYPTOGRAPHY";
const string ciphertext = "CSASTPKVSIQUTGQUCSASTPIUAQJB";
var key = new Key <string>("ABCD");
var alphabet = new Alphabet("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
var cipher = new VisenereCipher(alphabet);
Assert.AreEqual(plaintext, cipher.Decrypt(ciphertext, key));
}
public void AbsorbtionTest()
{
const string plaintext = "CRYPTOISSHORTFORCRYPTOGRAPHY";
var key = new Key <string>("ABCD");
var alphabet = new Alphabet("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
var cipher = new VisenereCipher(alphabet);
Assert.AreEqual(
plaintext,
cipher.Decrypt(cipher.Encrypt(plaintext, key), key));
}
public void DecryptWrongTextTest()
{
var key = new Key <string>("ab");
const string ciphertext = "aacabc";
var cipher = new VisenereCipher(new Alphabet("ab"))
{
IsStrict = false
};
Assert.AreEqual("abcbbc", cipher.Decrypt(ciphertext, key));
}
public void DecryptWrongTextStrictTest()
{
var key = new Key <string>("ab");
const string ciphertext = "aacabc";
var cipher = new VisenereCipher(new Alphabet("ab"))
{
IsStrict = true
};
cipher.Decrypt(ciphertext, key);
}