US Patent 11283793 Securing user sessions

Techniques for securing user sessions using a time-based one-time password (TOTP) generated from a shared secret. The shared secret can be a cryptographic hash of one or more user credentials. In response to a successful authentication based on the user credential(s), a session is created. The authentication is performed in connection with an initial access request from a client application. A subsequent access request for a protected resource during the session is processed by extracting a session cookie and a TOTP and generating a corresponding TOTP using the shared secret. The TOTP can be generated by combining the shared secret with one or more additional parameters such as a Uniform Resource Locator associated with the resource, or the session cookie. Access to the protected resource is conditioned upon the session, which is identified by the session cookie, being valid and upon the TOTPs matching.