Certificate Extensions. [2018-04-28]. (原始内容存档于2018-12-15). CertificationPathValidation. Internet X.509 Public Key Infrastructure Certificate and Certificate
pursuing this kind of certification, GnuTLS has been FIPS-140-2 certified in several systems by third parties." GnuTLS 3.5.6 B.5 Certification (页面存档备份,存于互联网档案馆)