Difference between a stream cipher and a block cipher

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Explain the following concepts:

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?

Reference no: EM13273166

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