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NOP sled technique is used for what?
Finding correct size of buffer.
Finding the return pointer address
A NOP-sled is the oldest and most widely known technique for successfully exploiting a stack buffer overflow. It solves the problem of finding the exact address of the buffer by effectively increasing the size of the target area EDIT: in basic BOF, NOP is used only to find and overwrite the return pointer or EIP. You can succefully exploit BOF with NOP without known the buffer address
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