====== e-Correspondence Package ======
===== Introduction =====

The e-Correspondence Package (ECP) is a package structure that is designed to carry out the official 
correspondence between public institutions and organizations in an electronic environment. The information and components of official letters turn into a single electronic file by specific rules with ECP. This package structure enables cover letters and attachments in official writings can be signed as a whole at once. Updates were made to the existing data structure of the e-Correspondence Package and the use of electronic seals was made technically possible with the [[https://www.tccb.gov.tr/assets/dosya/eyp/dokuman/e-Yaz%C4%B1%C5%9Fma%20Teknik%20Rehberi%20v2.0.pdf|“ECP 2.0 e-Correspondence Technical Guide”]] published by the Presidency of the Republic of Turkey Digital Transformation Office on August 28th, 2020.
 
In line with the “Regulation No. 2022/31821 on the Procedures and Principles to be Applied in Confidential Documents”, there is a need  to create a new package structure when the confidentiality levels of expired confidential documents are updated. In order to meet this need, the [[https://www.tccb.gov.tr/assets/dosya/eyp/dokuman/e-Yaz%C4%B1%C5%9Fma%20Teknik%20Rehberi%20v2.1.pdf|“ECP 2.1 e-Correspondence Technical Guide”]] was published in June 2024. With the new structure, it is possible to create an e-Correspondence Update Package containing the updated information (declassification of document) while preserving the original e-Correspondence Package. In addition, for exceptional institutions, the opportunity to create a Paraph Electronic Signature, Electronic Signature and Electronic Seal in accordance with the P3 profile with a long-term compatibility was provided.