In symmetric key cryptosystem, assume that Alice and Bob have set up a common key Kab. This key is only known to Alice and Bob. (1a) Can we achieve data origin authentication?

Question

Bridget Wu

Computers & Technology

6 June, 22:21

In symmetric key cryptosystem, assume that Alice and Bob have set up a common key Kab. This key is only known to Alice and Bob. (1a) Can we achieve data origin authentication?

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Answers (1)

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Alana Beltran · Answer 1

yes

Explanation:

If it is guranteed the key is only known to Alice and Bob and there is no risk of man in the middle attack or channel spoofing so we can achieve data origin authentication