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I suspect that KCV's are in general not used because they don't add enough to be worth the small overhead. There are a number of cryptographical attacks on encrypted methods that involve the attacker modifying a valid ciphertext, and then having the receiver decrypt the modified message (and watch how the receiver reacts). Because of these attacks, it is ...

In order for a symmetric block cipher to be considered secure by modern standards, it has to be IND-CPA, that is indistinguishable from a random oracle under a chosen plain text attack. It also has to be IND-CCA and IND-CCA2, but IND-CPA is sufficient for it to also be secure under a known plain text attack. Presuming TwoFish is still unbroken, it should ...