Question

Explain the differences between a replay attack and a Man-in-the-middle attack.

Answer 1

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A replay attack is when the attacker is able to capture some of your data packets on their way to the intended destination. They will then try to re-use this information to attack your network. You can mitigate this by using strong session security and digital signatures.

Man in the middle attacks are similar to replay attacks. The attacker will sometimes try to intercept the data or just capture some to use later. They may try to make the sender think they are the legitimate receiver. They may also try to add new messages and pass them on.

In the man-in-the-middle attack the intent is simply to capture the data, but in a replay attack the intent is to reuse the data in an attack.

A man-in-the-middle attack is a form of active interception or eavesdropping. An attacker can use a sniffer or protocol analyzer (such as Wireshark) to capture transmitted data. A wireless access point placed in a wireless closet and transmitting captured data to someone outside the building can be considered a man-in the middle attack.

In a replay attack the captured data is later used to formulate an attack using the trasmitted data. For example, if the captured data includes credentials, the attacker can use those credentials to impersonate the client with slightly modified data packets.

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