What is the purpose of Perfect Forward Secrecy in encrypted communications?
Eliminating the possibility of hash collisions
Allowing recovery of lost encryption keys
Ensuring that future key compromises don't affect past communications
Preventing the need for certificate authorities
The correct answer is Ensuring that future key compromises don't affect past communications. Perfect Forward Secrecy (PFS) is a property of specific key agreement protocols that ensures session keys will not be compromised even if the long-term secret key of the server is compromised. This means that recorded past communications cannot be decrypted even if the server's private key is later obtained by an attacker.
Preventing the need for certificate authorities is incorrect because PFS doesn't eliminate the need for certificate authorities; these still verify identities.
Eliminating the possibility of hash collisions is incorrect because PFS is unrelated to hash collisions, which concern hash functions.
Allowing recovery of lost encryption keys is incorrect because PFS actually makes key recovery impossible by design.
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