Security
TR
Abbreviation for Technische Richtlinie
In short and in plain language
A TR is a technical rule.
A German state office for security writes down what safe tech needs.
It is usually just advice.
It can serve as a yardstick. One use is safe email.
Definition
A TR is a technical guideline in which the German Federal Office for Information Security describes requirements for secure technology. It is generally a professional recommendation. It can serve as a benchmark, for example for securing email.