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Program's interface
GPU configuration is pretty simple and consists of only two parts:
1. Setting the number of parallel graphics card’s blocks, where passwords would be searched. Typically,
each block consists of 256 threads. Thus, if you set the number of blocks to 256, the GPU will run
256*256=65536 threads. The total number of checked passwords for one call to GPU kernel will be
256*ThreadBlocks*PasswordsPerThread. In our case 256*256*1000 = 65 536 000 passwords. Setting
the ThreadBlocks parameter smaller than 256 on modern graphics cards, in the majority of cases,
leads to performance degradation.
2. Setting the number of passwords to be search from a single thread. The greater the value, the lower
the overhead associated with launching threads, and the higher the search speed. However, setting
too great a value may hang the computer or cause significant fluctuations in the current search speed,
displayed on the attack status tab. This is caused by the fact that task completion time on the GPU
exceeds the time required for refreshing the current state of the attack. Setting too big numbers may
cause a system failure.
2.8.2.17 GPU: Mask attack
Mask options
Mask attack is an irreplaceable tool when you know a fragment of the password or have any specific
details about it. For example, when you know that the password consists of 12 characters and ends with
the qwerty, it is obvious that searching the entire 12-character range of passwords is unreasonable (and
useless, for it takes ages to complete). All what would be required in this case is to guess the first 6
characters of the sought password. That is what mask attack is for.
Windows Password Recovery
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