The Open Source Security Testing Methodology Manual 3.0 covering security testing, security analysis, operational security metrics, trust analysis, operational trust metrics, and the tactics required to define and build the best possible security over Physical, Data Network, Wireless, Telecommunications, and Human channels.
You can download it from the following link: https://packetstormsecurity.com/files/download/96715/OSSTMM.3.pdf
Source: https://packetstormsecurity.com/files/96715/OSSTMM-3.0.html