A “security.txt” file is a standard proposed by security researcher Ed Foudil in 2017 as a way for websites to define a security policy. It’s akin to the well-known “robots.txt” file which specifies rules for web crawlers. The security.txt file allows website owners to provide information to security researchers about how to report security vulnerabilities or concerns.

Since April 2022, Security.txt has been an Internet Engineering Task Force (IETF) informational standard

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