Question: For a cipher, what is unconditional ( or information theoretic ) security? How does it differ from computational security? Please define both terms. Give an

For a cipher, what is "unconditional"

(

or "information theoretic"

)

security? How does it differ from computational security? Please define both terms. Give an example of a cipher that achieves unconditional security and a cipher that achieves computational security. Are there any downsides or onerous requirements of achieving information theoretic security?

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