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One obvious thing that it is vulnerable to a known plaintext attack that truncates the known message. This attack is quite simple; suppose the attacker knows a message $(P_1, P_2, ..., P_n)$ and the corresponding ciphertext $(C_1, C_2, ..., C_n, T)$ (using some IV; we don't care what it is). Here is how the attacker can generate a ciphertext that would ...


There are two parts to this proposal: the use of a code book and a scheme to send short confidential and authenticated messages utilising an existing shared symmetric key. A code book can be used alone to provide a degree of confidentiality, or can be used to ascribe specific pre-agreed meanings to short messages, in combination with any scheme for sending ...

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