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Looks like 0-RTT in TLS1.3 comes with a quite high price: Vulnerability to replay attacks.

If you are one of the early adopter, check that your application is not affected as this is a fundamental problem on protocol level.

"What Application Developers Need To Know About TLS Early Data (0RTT)" by Paul Kehrer:

blog.trailofbits.com/2019/03/2

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