Q15

MCQ1 mark, −0.33

A sender $S$ sends a message $m$ to receiver $R$ , which is digitally signed by $S$ with its private key. In this scenario, one or more of the following security violations can take place. Which of the following are possible security violations? I and II only I only II only II and III only

(A)

$S$ can launch a birthday attack to replace $m$ with a fraudulent message

(B)

$A$ third party attacker can launch a birthday attack to replace $m$ with a fraudulent message

(C)

$R$ can launch a birthday attack to replace $m$ with a fraudulent message

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