| 摘要 |
The present invention relates to a method for generating an encryption/decryption key, and especially for generating a one-time encryption/decryption key used for symmetric encryption, i.e. where the same key is used both for encryption and decryption. In order to stait key generation a first node (A) sends a request to a central server (2) for setting up communication with a second node (B). The central server (2) sends a key generating file both the nodes (A and B) Each node generates a different intermediate data set, i.e a first and second data set. The first data set generated by the first node (A) is sent to the second node (B), which based on this data set generates a third data set which is sent back to the fust node. The generating of a first cryptogiaphic key in node (A) is based on bit by bit comparison between the third and the first intermediate data set and the generation of a second cryptographic key is based on bit by bit comparison between the first and the second intermediate data set. The first and second cryptographic key being the same.
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