Abstract: Data communication security systems and methods are disclosed. One such system includes a network interface configured for transport layer protocol communications at a communication port. The network interface includes a security module communicatively connected to a transport layer data path. The system further includes a file-based application programming interface defining a plurality of attributes of the network interface and including at least one attribute associated with data encryption managed by the security module and accessible for use in logical I/O operations.

Abstract: A tandem master cylinder having a small-diameter cylinder formed on the same axis as a cylinder bore in a floating piston, communicating with a primary fluid pressure chamber and a secondary fluid pressure chamber. A small-diameter piston is movably inserted in the small-diameter cylinder, dividing the primary fluid pressure chamber from the secondary fluid pressure chamber. A small-diameter piston spring is mounted in the small-diameter cylinder, pressing the small-diameter piston toward the secondary fluid pressure chamber. A stop is provided in the small-diameter cylinder to stop the forward movement of the small-diameter piston in the small-diameter cylinder. An elastic member is disposed in an unbiased state between the small-diameter piston and a cylinder front end wall. The elastic member has an elastic force in a direction of compression which is greater than that of the small-diameter piston spring.