How is the sonic transmission of the one-time token encrypted?
The one-time token is the only item transmitted sonically. It expires in 20 seconds and can be used only once. The duration of the session is a parameter, adjustable to meet security and user experience needs.
The sonic transmission technology uses advanced DSP algorithms comprising an audio codec. The signal generation part of the codec resides in the Authentication Server and the decoding is part of the Cyberus Key mobile app. During sonic transmission, each OTP bit is coded in a narrow band spread spectrum audio signal centred at the far end of the decodable audio spectrum. Each OTP bit is represented by a 63-chip PN sequence symbol, which is correlated to securely stored patterns in the application’s DSP codec algorithm. Each OTP bit packet is verified with advanced error checking resulting in high reliability and noise resiliency.