Secrecy refers to protecting against unauthorized data disclosure and ensuring the authenticity of the data source.
The essential security function that cryptography offers is confidentiality. It is a security service that protects the data from being accessed by unauthorized parties. It is sometimes referred to as secrecy or privacy.
Front-facing secrecy is a node (user) must refrain from reading any messages once it leaves the network. Backward secrecy is the requirement that when a new node (user) joins the network, it not read any messages that have already been sent cryptographic characteristics.
A component of an encryption system that offers perfect forward secrecy changes the keys it uses to encrypt and decode data automatically and often, exposing only a small percentage of the user's sensitive information if the most recent key is compromised.
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