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1

The property that you are looking for is the "online" property of a stream cipher. CCM was however developed for packet encryption where the size of the data is known beforehand. So CCM lacks the strict online requirements for an online cipher. However, since the cipher underneath still uses counter mode, the encryption itself can still be performed on each ...


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To attempt such a proof you need a definition of what security properties an IV-based stream cipher is supposed to provide. For example, like this (very informally): A nonce-based cipher is secure if and only if its encryptions are indistinguishable from random bitstrings of the same length to a nonce-respecting adversary that's allowed to carry out a ...


2

Firstly, by what mechanism could Oscar gain the first 300 bits of plaintext? It makes little sense for Alice (the person who tries to securely communicate with Bob) to send encrypted and plain text together. This is called a Known-Plaintext Attack (KPA). In some real-world examples, this attack makes sense. Also, we want our cipher to resist to KPA, we ...


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