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How secure is this cipher? At first glance, not very. It would appear to be vulnerable to a ciphertext-only attack, for example, the attacker can recover the plaintext given a ciphertext of about 10k (actually, he probably can deal with less), even assuming that all the attacker initially knows is that the plaintext is "ASCII English", and he has no ...


2

It's not clear what they actually mean by half of their things, or if there is any benefit of using them together. That site doesn't want to create any meaningful security, it's just to play around with numbers and letters. They state to use Vigenere, that's okay, usual classic cipher, which can be broken if the text is long enough. "Caesar box code": I ...



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