Unconditional Security
Information-theoretic security is often used interchangeably with unconditional security. However the latter term can also refer to systems that don't rely on unproven computational hardness assumptions. Today these systems are essentially the same as those that are information-theoretically secure. However it does not always have to be that way. One day RSA might be proved secure, thus becoming unconditionally secure, but it will never be information-theoretically secure.
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—Thomas Jefferson (1743–1826)