Reply To "Comment on 'Quantum String Seal Is Insecure' "

TL;DR

This paper clarifies a disagreement over the security of quantum string seals, emphasizing different criteria for information reveal and correcting a misapplication of measurement strategy.

Contribution

It resolves a debate by clarifying the criteria for information security and correcting a misinterpretation of the measurement strategy in quantum string seals.

Findings

Different criteria lead to different security conclusions.

He did not correctly follow the proposed measurement strategy.

The original proof remains valid under the correct interpretation.

Abstract

In Phys. Rev. A. 76, 056301 (2007), He claimed that the proof in my earlier paper [Phys. Rev. A 75, 012327 (2007)] is insufficient to conclude the insecurity of all quantum string seals because my measurement strategy cannot obtain non-trivial information on the sealed string and escape detection at the same time. Here, I clarify that our disagreement comes from our adoption of two different criteria on the minimum amount of information a quantum string seal can reveal to members of the public. I also point out that He did not follow my measurement strategy correctly.