For confidential communication between a group of n users requiere n(n-1)/2 number of keys, such that each key is specific to communication between only two persons.
Symmetric / Shared Key Cryptosystem

February 26, 2026 • 1 min read
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Public key cryptosystem is alternative to symmetric/shared key cryptosystem. This system contains two keys :
A person / hacker who listens between two parties