From the course: CompTIA SecurityX (CAS-005) Cert Prep

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Forward secrecy

Forward secrecy

From the course: CompTIA SecurityX (CAS-005) Cert Prep

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Forward secrecy

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- Let's talk about forward secrecy. Forward secrecy is also known as perfect forward secrecy or PFS, and it's a feature of specific key agreement protocols. For example, Diffie-Hellman Key exchange that ensures a session key derived from a set of long-term keys cannot be compromised if one of the long-term keys is compromised in the future. Forward secrecy means that even if an attacker gains access to the private key, they cannot decrypt past session keys, and therefore, past communications; for example, IPSec. In essence, forward secrecy protects the past sessions against future compromises of secret keys or password credentials. This is achieved by generating unique session keys that are ephemeral for each communication session, so they're not based on any previous session keys. If a session key is compromised, it doesn't affect the security of previous or future sessions. Some practical use cases of forward secrecy would be secure messaging. Applications like WhatsApp, Signal, and…

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