CRL: An electronic file which is signed by the TSP where the revoked certificate information is included.

ECP: E-Correspondence Package is a form of information and components of an official letter expressed as a single electronic file in accordance with defined rules. ECP consists of the components Cover Letter(Üst Yazı), Metadata(Üst Veri), Final Metadata(Nihai Üstveri), Core, Package Hash(Paket Özeti), Final Hash(Nihai Özet), Electronic Signature(Elektronik İmza), Electronic Seal (Elektronik Mühür), and, if exists, Attachment, Paraph Hash(Paraf Özeti) and Paraph Electronic Signature(Paraf Elektronik İmza). It allows the official letter to be digitally signed in one go with the cover letter and its attachments as a whole.

Electronic Seal: As defined in the Procedures and Principles Regarding Institutional Encryption and Electronic Seal Certificates published by the ICTA with the Board Decision dated 29/05/2019 and numbered 2019/DK-BTD/160, The Electronic Seal represents the data in electronic form which is attached to or logically associated with other data in electronic form and which is used to validate the corporative identity of the owner of the Electronic Seal.

Electronic Seal Certificate: As defined in the Procedures and Principles Regarding Institutional Encryption and Electronic Seal Certificates published by the ICTA with the Board Decision dated 29/05/2019 and numbered 2019/DK-BTD/160, the electronic certificate issued by Kamu SM that is used to securely identify and verify the corporate identities of parties making correspondence in electronic document sharing between public institutions and organizations.

OCSP: A protocol that provides the current revocation information for a certificate to be obtained online. Revoked certificates are immediately notified to the OCSP server. The client that connects to the OCSP server acquires the revocation status information from the server. OCSP is developed as a complement to CRL to address CRL's delay, scalability and management issues.

Profile 4 (P4): Long Term and OCSP Controlled Secure Electronic Signature Policies (Profile P4) is a signature profile defined in the Electronic Signature Usage Profiles published by the Information and Communication Technologies Authority (ICTA) dated on 2/7/2012 and numbered 2012/DK-15/299.

Qualified Certificate: Electronic certificate is an electronic file used to prove the identity of an entity in the electronic environment such as identity card and driving license. A Qualified Certificate is a special type of electronic certificate issued to natural person and shall be established as defined in the Article 9 of Electronic Signature Law No. 5070.

Secure Electronic Signature: “Data in electronic form which is attached to or logically associated with other data in electronic form and which is used for authentication purpose” as defined in Article 4 of Electronic Signature Law No. 5070.

TSP: Trust service providers are trusted institutions that produce, distribute and manage certificates on behalf of individuals and institutions.