A method and network for communicating between a group of entities a text encrypted using an encryption key intrinsic to the group of entities in a network having a plurality of entities and a center.

摘要

In a network having a plurality of entities and a center, the center creates random numbers for all the combinations composed of two of entities within the network, and delivers to each entity random numbers created for the combinations involving its entity. A sender entity selects a random number corresponding to a combination of the own entity and a sending destination entity from a group of random numbers delivered to the own entity, and encrypting a communication text using an encryption key determined by the selected random number to send it to said sending destination entity. A sending destination entity selects a random number corresponding to a combination of the own entity and the sender entity from the random numbers delivered to the own entity, and decoding a cipher text received using an encryption key determined by the selected random number.