What is your understanding of the difference between a stream cipher and a block cipher?

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What is your understanding of the difference between a stream cipher and a block cipher? What are two ways to launch a cryptanalytic attack against a cipher (based upon what the attacker knows or has in possession)? Be sure to provide detailed examples. What is your understanding of the difference between an unconditionally secure cipher and a computationally secure cipher? Your organization has asked for a cryptographic algorithm recommendation for a new project that requires high-level security. What algorithm would you recommend and why?

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