[BCP107]   Best Current Practice 107,
              <https://www.rfc-editor.org/info/bcp107>.
              At the time of writing, this BCP comprises the following:

              Bellovin, S. and R. Housley, "Guidelines for Cryptographic
              Key Management", BCP 107, RFC 4107, DOI 10.17487/RFC4107,
              June 2005, <https://www.rfc-editor.org/info/rfc4107>.