| ADSS | Advanced Digital Signature Services (a server-side product from Ascertia for providing signature generation/verification, certificate validation and other trust services) |
| ARP | Advanced Revocation Provider. It can be either of ARP Lite, ARP Enterprise Edition (EE), ARP Standard Edition (SE) |
| API | Application Programming Interface; defines the hierarchy and relationship among classes and the function inside them |
| CA | Certificate Authority (logical entity responsible for issuing certificates and optionally also CRLs) |
| CSC | CA certificate status check; used in Identrust architecture to check revocation checking of CA certificates |
| CAPI | Microsoft Crypto API. The underlying library performing cryptographic operations on Windows platform |
| Cert | Digital Certificate |
| CRL | Certificate Revocation List |
| CMS | Cryptographic Message Syntax (a digital signature format) |
| DBMS | Database Management System |
| DSA | Digital Signature Algorithm |
| DSS | Digital Signature Service (a web services standard from OASIS organisation) |
| GTF | Global TrustFinder; a server running locally where some online services of our product are deployed |
| FSS | File Sign&Seal |
| FP | Freshness Proof; used in Identrust architecture to check revocation checking of OCSP responder certificates |
| HA | High Availability; term used to mention high percentage availability of an IT system so with fall-back options to prevent single point of failure. |
| HSM | Hardware/Host Security Module |
| HTTP | Hyper Text Transfer Protocol |
| HTTP/S | HTTP over SSL/TLS connection |
| IE | Internet Explorer browser |
| IIS | Microsoft Internet Information Server |
| JDK | Java Development Kit; Software development kit for Java base software development |
| JDBC | Java Database Connectivity |
| IETF | Internet Engineering Task Force |
| LDAP | Lightweight Directory Access Protocol |
| LDAP/S | LDAP over SSL/TLS connection |
| LTANS | Long-Term Archive and Notary Service |
| PKCS | Public Key Cryptographic Standards |
| PKI | Public Key Infrastructure |
| PDF | Portable document format |
| RSA | Rivest, Shamir, Adleman (public key algorithm) |
| OCSP | Online Certificate Status Protocol (an IETF protocol for verifying the revocation status of a digital certificate) |
| SCVP | Server-based Certificate Validation Protocol |
| SHA | Secure Hash Algorithm (various different algorithms in this family, e.g. SHA-1, SHA-256, SHA-512 etc.) |
| S/MIME | Secure MIME (standard for signing emails) |
| SSL | Secure Sockets Layer |
| TA | Trust Authority (general term for an authority trusted for some e-service(s), e.g. for issuing certificates, CRLs, OCSP responses and/or time stamps) |
| TLS | Transport Layer Security (a later version of SSL) |
| TFOCSP | Trust Finder OCSP server to handle OCSP request |
| TSA | Time Stamp Authority (authority responsible for issuing timestamp tokens to prove that a document/data existed at a particular time) |
| TSP | Time Stamp Protocol (the protocol for communicating with a TSA) |
| VA | Validation Authority (logical entity responsible for validating certificates or verifying full digital signatures) |
| XKMS | XML Key Management Specifications |
| XML DigSig | XML Digital Signature standard |