IATA welcomes ICAO Health Master List
![](https://morningtopnews.com/wp-content/uploads/2022/02/25e6d04d6d1cf801a3e06f22f60c4897.jpg)
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A public key enables third parties to verify that a QR code displayed on a health credential is authentic and valid. The HLM is a compilation of public key certificates signed by ICAO and regularly updated as more health proofs are issued and new public keys are required.
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