Title: Online TLS secure element for low-power high-security personal servers.
Abstract.
TLS for secure elements (TLS-SE [1]) is a TLS1.3 pre-shared-key (PSK) profile for secure elements. Ten billion secure elements are produced every year, including six billion Javacards, which execute applications written in the Javacard language. The physical size of an SE chip is about 5x5mm². TLS-SE can be implemented in Javacard, identified by a TLS server name (SEN, Secure Element Name) included in the historical bytes (up to 15 bytes) of the Answer To Reset (ATR).
Secured resources (SE security level is about EAL6+ according to Common Criteria standards) are available thanks to Uniform Resource Identifiers (URI) such as:
shells://sen@xxxxxxxxxx/?query, in which the query syntax is an open topic.
A Secure Element server may use a single SE (nano server, [1]) with an ISO7816 physical interface, or a grid of SEs (personal server, [3]), for example connected via an I2C bus.
Nano servers [1][2] can be designed with a system on chip (SoC) using open IDEs such as Arduino. With a Wi-Fi interface, the observed power consumption is about 0,2 W (5 W/day), so a small solar panel can be used for power supply.
Personal servers [3] use Secure Element Processors (SEP) implementing an I2C bridge with an ISO7816 interface. They are connected to the internet via a TCP/IP host such as Raspberry Pi. They also support the RACS [4] protocol for on-demand services. The observed power consumption is about 1,6 W + NSE * 0,15 W.
The TLS-SE ecosystem [5][6] is based on open hardware and software technologies (Arduino IDE, C/C++ GCC, Javacard Oracle JDK). We are looking for partners to develop an application framework realizing open trusted services for internet users.
[1] https://datatracker.ietf.org/doc/draft-urien-tls-se/
[2] https://datatracker.ietf.org/doc/draft-urien-core-tls-se-io/
[3] https://datatracker.ietf.org/doc/draft-urien-coinrg-iose/
[4] https://datatracker.ietf.org/doc/html/draft-urien-core-racs
[5] https://github.com/purien/TLS-SE
[6] https://github.com/purien/IoSE
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