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A hacker's tool sniffs a packet on the network, locates the ISN, and then calculates the next sequence number. This process is difficult because:
Sniffing the packet is not possible
It is impossible to locate the ISN in the packet
Packets travel very fast
Packet is encrypted
An attacker has to sniff a packet, locate the ISN, and calculate the next ISN, all before the next packet is sent to the server. Edit: Why was "packet is encrypted" marked as the correct answer? Previously, it was "packets travel very fast." Corrected answer as explanation is correct and corresponds to "packets travel very fast."
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