= Let's Encrypt =

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[[Letsencrypt]] を見てください。

https://letsencrypt.org/howitworks/

Without Automatic Web Server Configuration

This will simply place your new certificate in the current directory.

$ letsencrypt -d example.com auth

https://github.com/letsencrypt/letsencrypt

== Mitigating DNS fragmentation attack ==

Oct 2018
https://community.letsencrypt.org/t/mitigating-dns-fragmentation-attack/74838

関連論文:
https://dl.acm.org/doi/10.1145/3243734.3243790

Domain Validation++ For MitM-Resilient PKI

https://i.blackhat.com/eu-18/Thu-Dec-6/eu-18-Heftrig-Off-Path-Attacks-Against-PKI.pdf

OFF-PATHATTACKSAGAINSTPUBLIC KEYINFRASTRUCTURES