Abstract: A method of increasing communication security may include receiving, from a first computer system at a second computer system, a message including a data portion, wherein the data portion is associated with a security token, and wherein the data portion includes a session key. The method may also include performing, at the second computer system, processing associated with the message. The method may further include accessing, responsive to the processing, the session key from the data portion.

Abstract: A method of increasing communication security may include receiving, at a first computer system, a first message including a first data portion and a second data portion, wherein the first data portion is associated with a security token, wherein the first data portion includes a first instance of a session key, and wherein the second data portion includes a second instance of the session key. The method may also include generating a second message including the first data portion. The method may further include communicating the second message from the first computer system to a second computer system.

Abstract: A plurality of connections may be established between an accessory interface and a plurality of accessories. A connection between the accessory interface and a portable electronic device may also be established. A first set of messages may be communicated via the accessory interface between an application of the portable electronic device and a first accessory of the plurality of accessories. A second set of messages may be communicated via the accessory interface between the application and a second accessory of the plurality of accessories. The first and second sets of messages communicated between the portable electronic device and the accessory interface may be formatted in accordance with the same data exchange pattern.