| AICPA | American Institute of Certified Public Accountants |
| CA | Certification Authority |
| CAA | Certification Authority Authorization |
| ccTLD | Country Code Top-Level Domain |
| CICA | Canadian Institute of Chartered Accountants |
| CP | Certificate Policy |
| CPS | Certification Practice Statement |
| CRL | Certificate Revocation List |
| DBA | Doing Business As |
| DNS | Domain Name System |
| FIPS | (US Government) Federal Information Processing Standard |
| FQDN | Fully Qualified Domain Name |
| IM | Instant Messaging |
| IANA | Internet Assigned Numbers Authority |
| ICANN | Internet Corporation for Assigned Names and Numbers |
| ISO | International Organization for Standardization |
| NIST | (US Government) National Institute of Standards and Technology |
| OCSP | Online Certificate Status Protocol |
| OID | Object Identifier |
| PKI | Public Key Infrastructure |
| RA | Registration Authority |
| S/MIME | Secure MIME (Multipurpose Internet Mail Extensions) |
| SSL | Secure Sockets Layer |
| TLD | Top-Level Domain |
| TLS | Transport Layer Security |
| VOIP | Voice Over Internet Protocol |
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