Abstract: A method for detection and use of device identifiers to enhance the security of data transfers between electronic devices. A first electronic device can transmit access data to a second electronic device. The access data can be associated with a first access code that can be generated based at least in part on data representing a device identifier of the first electronic device. A device identifier can uniquely identify the first electronic device from a plurality of electronic devices. Transferring the access data can involve transforming the first access code into a second access code that can include data representing a device identifier associated with the second electronic device. Transforming the first access code into the second access code can facilitate access to a resource associated with the access data for a second user, but not for a first user.

Abstract: Systems and methods for validating physical tickets and for converting physical tickets to electronic tickets are described. Optionally, a physical ticket may be authenticated using information accesses from a ticket issuer database. Optionally, a user may transfer a validated ticket and/or an electronic ticket to another user.