Remote APDU Call Secure Lite(RACSL)

The Remote APDU Call Lite protocol (RACSL) is a lightweight version of the Remote APDU Call Secure protocol (RACS). RACS is designed for Grids of Secure Elements (GoSE), where servers host Secure Elements (SEs), i.e., tamper-resistant chips providing secure storage and cryptographic capabilities. It supports commands for GoSE inventory and data exchange with secure elements. RACSL targets environments hosting a limited number of secure element-typically one-within an IoT device managed by a microcontroller. It provides commands for data exchange with secure elements, in particular for managing their embedded applications. These commands are transported over TLS 1.3 pre-shared key (PSK) sessions, which MAY be secured using a TLS Identity Module (TLS-IM) application hosted within a secure element. RACSL can be used to update TLS-IM applications or to remotely access computing and storage resources hosted in secure elements.