Abstract: An information encrypting transmission and reception method in an information transmission and reception network composed of a plurality of senders and receivers having computers being connected and communicating each other via a web network and a data center having a server computer for receiving electronic key data of bit data formed by the senders and receivers and personal data such as address corresponding to each electronic key data to register the serer computer and certifying the senders and the receivers with each personal data.

Abstract: A sender server computer 5 for transmitting and receiving data of a sender 5 and a receiver server computer 6 for transmitting and receiving data of a receiver 4 that are connected to the web network; firstly encrypting bit data FD of original information such as plaintext to be transmitted from the sender 3 to the receiver 4 by performing an exclusive OR operation in use of bit data of electronic key of the sender 3 and transmitting the firstly encrypted bit data CR1 attached with personal data of the receiver 4 to the sender server computer 5; by the sender server computer 5, receiving bit data CS of the electronic key of the receiver 4 by submitting personal data of the receiver 4 to the data center 2, secondly encrypting the firstly encrypted bit data CR1 by performing exclusive OR operation in use of received bit data CS of the electronic key of the receiver 4, and transmitting the secondly encrypted bit data CR2 attached with personal data of the sender 3 and the receiver 4 to the receiver server comput