uSSH SDK by Cypherbridge Systems is a portable ANSI C SSH embedded server and client solution for interactive shell TCP/IP security layer. It implements secure interactive shell and SSH tunneled application functions, providing a flexible TCP/IP security layer for applications with a built-in command dispatcher. The SDK adds SSH and secure TCP/IP tunnel capabilities to embedded systems, including an embedded server and client with a flexible interactive shell. It implements standards-based, interoperable file copy protocols and encrypts network connections between clients and servers. The SDK supports both password and public key authentication methods and is designed for easy integration with RTOS features. It can be compiled for various processors and platforms, offering utilities and toolkits for managing user accounts and private keys. The SDK features configurable cipher suites and an integrated compact math and crypto library, leveraging SSH security architecture.