American Express Company
Transaction device use of a dynamically generated value based on a next expected session key

Abstract:

A system, method, and computer readable medium (collectively, the "system") are provided. The system may include a processor configured to perform operations and/or steps comprising storing, by a processor, a session key on a mobile device, wherein the session key is encrypted. The system receiving a transaction request, decrypting the session key, and broadcasting a signal configured for being received by a magnetic stripe reader. Track 1 data and/or track 2 data may be encoded in the signal. The track 1 data and/or the track 2 data may also comprise a dynamically generated value that is generated based on the session key.