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I was going over the internet reading about types of attacks on a computer system and I can not differentiate between MITM, Replay and TCP Session Hijacking.
They appear to be the same.
Sniff the data , change it , retransmit.
Please let me know if they are the same or different.

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You might want to know about security.stackexchange.com –  Chris W. Rea Jul 24 '12 at 14:37
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closed as off topic by random Jul 24 '12 at 14:05

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1 Answer

up vote 2 down vote accepted

Replay attacks and Session hijacking are two types of Man In The Middle attack. MITM is the set, the other two are subsets.

You can be a man in the middle doing an attack on VoIP, some kinds of cryptography, etc.

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Replay attack: capture , change , send TCP Hijacking: capture , change , send. Where do they differ then?? –  Fasih Khatib Jul 24 '12 at 13:10
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Fasih, they differ in what you are attacking. TCP Session hijacking will ONLY hijack a TCP session. A replay attack can be used against TCP, cryptography, etc... A replay attack falls under the classification "Man In The Middle," just like a session hijack does. –  Everett Jul 24 '12 at 13:14
    
OK so Replay can be retransmitting anything while TCP hijacking is ONLY retransmitting the TCP packets? –  Fasih Khatib Jul 24 '12 at 13:16
    
That is correct. –  Everett Jul 24 '12 at 13:24
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