Hi Gopi,

If you know what you are doing and absolutely sure that your application doesn’t need encryption, you can try using the “MBEDTLS_CIPHER_NULL_CIPHER“ option for enabling ciphersuites without encryption: https://github.com/ARMmbed/mbedtls/blob/development/include/mbedtls/mbedtls_...

Regards, Janos

From: Subramanian Gopi Krishnan via mbed-tls mbed-tls@lists.trustedfirmware.org Date: Wednesday, 2 February 2022 at 19:53 To: mbed-tls@lists.trustedfirmware.org mbed-tls@lists.trustedfirmware.org Cc: V.B. Yugandhar vb.yugandhar@kone.com Subject: [mbed-tls] TLS Only for Data Authentication Hi,

I am developing TLS client and server for embedded systems. Considering the operational efficiency, it is sufficient to have data authentication. Is it possible to setup a TLS communication with data authentication and without encryption?

Consider a PLC network,

1. Within physical secure zone. 2. Requires faster data transfer. 3. Data are not confidential, but must be cryptographically authenticated.

Thanks, Gopi Krishnan