What is the difference between shared key and pre-shared key authentication?

1152325 pts.
Tags:
Authentication
I'm sorry for the 'homework-type question' but does shared key and pre-shared key mean the same thing in terms of authentication? Does pre-shared mean that it's already been shared by different parties? Thank you for the help.
1

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Hi,

The
difference is accurately the same as the language suggest.

“Shared key” means that the same
key is used by several party. It doesn’t tell you how the key was distributed
among them.

“pre-shared key” means the key has been shared
before the current operational context.

See these examples:-

  • When
    you perform a Diffie-Hellman key exchange in an SSL connection, you actually
    generate a new key that is shared by both client and server without any of them
    having a previous knowledge of that key. That key is shared but not pre-shared.
  • If
    you protect a ZIP file with a password, this password becomes the shared key
    and it must be shared between all parties. That key is both shared (everyone
    uses the same) and pre-shared (its distribution isn’t covered by the ZIP
    protocol and must be performed through a different secure channel before usage)

These
are only two examples, there are many more. I hope this is helpful for you.

Thanks & Regards

Clark kent

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