network security

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…for example IT-Centre. (http://www.8j.net/local_forms/passwd.html) Appendix C "Public keys are a common use of asymmetric keys. Though secret keys are easy enough to implement between two users, what if we need to contact many different users, and all of the messages need to be encrypted? It is inefficient to call each person, and make up a new secret key, for each transmission. These calls also jeopardise key security". (Beyda, 1996)