Supachai TangwongsanSathaporn KassuvanMahidol University2018-09-132018-09-132009-12-01ACM International Conference Proceeding Series. Vol.403, (2009), 891-8952-s2.0-74949118303https://repository.li.mahidol.ac.th/handle/123456789/27455In this paper, a security model is proposed to protect against eavesdropping threats over digital communications. The model is simple to implement with personalized security, but highly effective with a better level of confidentiality performance in operations. There are two stages of protection development. At first, any communicating parties could set up their own common encryption keys with Diffie-Hellman key-exchange protocol, followed by simple encryption rules so-called M:N ratio being notified prior to the start of conversation. By this technique, it is rather difficult for eavesdroppers to discover voice conversation if not totally impossible. The experimental results show that the system could perform its function accurately as designed. In this regard, the proposed system could be further extended and fully implemented for eavesdropping protection over digital networks, without any requirements to modify for changes in presently existing network systems at all. Copyright © 2009 ACM.Mahidol UniversityComputer ScienceConference PaperSCOPUS10.1145/1655925.1656087