RECEIVER, TRANSMITTER AND COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To provide a communication system, a receiver and a transmitter by which an original message is recovered in the case a missing code or a data error in data communication has occurred in a numeral code string of message data at reception and the message data are simply encrypted and the encrypted data are sent/received. SOLUTION: Data such as names, call numbers, passwords, contents of encryption are registered in personal data memories PM1, PM2 corresponding to a caller number of a possessor, and data such as names, call numbers, passwords, contents of encryption are registered in TEL bank memory areas TB1-TB2 corresponding to each destination. A caller pager encrypts message data according to the contents of encryption in response to secret designation, and in the case of receiving encrypted message data, when a password of the caller is accurately entered, the receiver side pager decodes the message data according to the contents of encryption of the opposite party and displays the contents of the message.