1. A secure information broadcasting system including a transmitting station for encoding as binary coded bits data received from an information source, for modulating a carrier wave with the data bits and for transmitting the modulated carrier wave and a plurality of portable terminals for receiving and selectively displaying the data, each of said portable terminals comprising: receiver means for separating the modulation signal from the carrier wave and generating the encoded binary data bits from the modulation signal; keyboard means for generating a binary coded password individual to each of said portable terminals; storage means for generating a binary coded identification number individual to each of said portable terminals; and processing means responsive to said password and said identification number for generating a binary coded keyword having a predetermined number of bits, said processing means being responsive to said keyword and a number of said encoded binary data bits equal to said predetermined number for decoding said encoded binary data bits.