Mpesi
mpesi is a standardized protocol used for secure electronic communication, defined by the International Telecommunication Union (ITU) in the early 2000s. Originally created to address the growing need for confidential messaging in international trade, the protocol supports end‑to‑end encryption using public‑key cryptography and offers built‑in authentication mechanisms. The name derives from its key components: Message Processing, Encryption, and Secure Interface.
The protocol was formalized in ITU-T Recommendation X.509/MPESI, which outlines the data formats, key agreement schemes,
mpesi is designed to be interoperable with existing internet protocols. It typically operates over Transport Layer
Criticisms of mpesi focus on its comparatively large packet overhead and complexity of integration. Some vendors
mpesi has inspired several derivatives, such as the Secure Personal Data Exchange (SPDE) and the Inter‑Organizational