Cyber Security Q&R Can Eve in this case scenario depicted above learn Alice’s cr
ID: 3755950 • Letter: C
Question
Cyber Security Q&RCan Eve in this case scenario depicted above learn Alice’s credit number as per of the replay attack???
Thanks f request for session key to Bob KA Alice Cathy Cathy Bob Alice (ks kB { Charge an iPhone X to my credit card 12345678 { I placed your order and it will arrive tomorrowy ks ( Thanks. This session is now complete.) ks { Acknowledged. I'm discarding key ks) ks Notation: (msg) ka indicates "msg" was encrypted with key kB Alice Alice and have it delivered to my house) ks Alice
Explanation / Answer
It is not possible for Eve to learn the credit card number of Alice using replay attack.He cannot use the replay attack in the first place.The session key Ks is a random number requested by Alice from Cathy.And this session key is encrypeted with key Kb and used for transaction with Bob giving his credit card details.After the acknowledgent, Bob discards the session key Kb.
Although Eve may sniff the session code which is encrypted,the session code is not valid for the next session or replay action as the session code is discarded and is invalid for this replay attack transaction.
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