The "US Government Family of Protection Profiles - Public Key-Enabled Applications for Basic Robustness Environments" protection profile (USMC - United States Marine Corps) outlines a series of security requirements applicable mainly to digital signature, encryption, authentication and auditing services. As these requirements were conceived for US military products, they feature the robustness and security that characterize this type of technology. They have also been Common Criteria evaluated and certified, which is an endorsement to the solution's validity.
Safelayer's TrustedX product complies with the requirements of this Protection Profile, including being Common Criteria EAL4+ certified. This makes TrustedX the only technology, apart from US defense products, to be certified with the US Protection Profile.