This paper refers to two distinct security models: perfect security and unconditional security. Until now, I knew of them as the same thing and equivalent to information-theoretic security.

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From the paper, it's obvious that perfect security is the same as information-theoretic security. In this case, what exactly is unconditional security?


According to the references, both perfect security and unconditional security consider adversaries that have unlimited computational power, i.e., information-theoretic security. I think the only difference is that unconditional security allows for negligible failure while perfect security requires zero failure.

  • $\begingroup$ This makes sense. Thank you. $\endgroup$ – SpiderRico Feb 10 at 6:59
  • $\begingroup$ @SpiderRico My pleasure :) $\endgroup$ – Shan Chen Feb 10 at 7:22

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