We are writing to inform you that on May 21, 2024, during scheduled system maintenance, we will be updating the TLS ciphers used for automated communication with the OTE system. This update will involve removing less secure ciphers and retaining only those considered strong.

The affected communication is participant -> OTE, and the list of supported ciphers is as follows:

• ECDHE-ECDSA-AES256-GCM-SHA384
• ECDHE-RSA-AES256-GCM-SHA384
• ECDHE-ECDSA-CHACHA20-POLY1305
• ECDHE-RSA-CHACHA20-POLY1305
• ECDHE-ECDSA-AES128-GCM-SHA256
• ECDHE-RSA-AES128-GCM-SHA256
• ECDHE-RSA-AES-256-GCM-SHA384
• ECDHE-RSA-AES-128-GCM-SHA256

We have already deployed the change to our testing environment, and we strongly recommend that you test your communication on the test environment and make any necessary adjustments to ensure compatibility with the updated ciphers.

We apologize for any inconvenience this may cause and appreciate your understanding.