1. Cooper, M., Dzambasow, Y., and Hesse, P., et al., RFC 4158. Internet X.509 Public Key Infrastructure: Certification Path Building, IETF Tools, 2005. https://tools.ietf.org/html/rfc5246.
2. Callas, J., Donnerhacke, L., Finney, H., et al, RFC 4880. OpenPGP Message Format, IETF Tools, 2007. https://tools.ietf.org/html/rfc4880.
3. Langley, A., No, don’t enable revocation checking, ImperialViolet, 2014. https://www.imperialviolet.org/ 2014/04/19/revchecking.html.
4. Zhao, W., Varadharajan, V., and Bryan, G., Modeling trust relationships in distributed environments, International Conference on Trust and Privacy in Digital Business, 2004, pp. 40–49.
5. Fromknecht, C., Velicanu, D., and Yakoubov, S., A decentralized public key infrastructure with identity retention, Cryptol. ePrint Arch., 2014. https://eprint.iacr.org/2014/803.pdf.