Abstract: The present invention provides a method of allowing a sender to encrypt a data object for transfer to a recipient via a communication system. The method includes determining biometric data representative of at least one of the sender and the recipient. The determined biometric data is used to generate an encryption key which is used to encrypt the data object. The encrypted data object is then transferred to the recipient via the communications system.

Abstract: A binary coded signal represented by sequential transmission of two frequencies, comprising means to determine if the frequency of the received signal is below or above a reference frequency generated within the receiver, means for recognizing a change in input frequency relative to the reference as start and end of bit intervals, means to establish if individual bits are of a "one" or "zero" level, means for converting the serial bits to a parallel digital word and means for storing this word indefinitely in the event the received data is a valid signal.