Disclosed are some implementations of systems, apparatus, methods and computer program products for encrypting and securely storing session data during a browser session using a session-based cryptographic key. The session data may be decrypted during the browser session or other browser sessions using the session-based cryptographic key or other backwards compatible session-based cryptographic keys. In addition, session-based cryptographic keys may be shared among browser sessions to enable encrypted session data to be decrypted across page refreshes and browser tabs.