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Questions tagged [crc]

Cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data.

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7
votes
2answers
429 views

Backblaze 16-bit checksum (“bzsanity”)

I use Backblaze to back up my computer. You restore files from your backups by selecting files to restore, which are then packed into large zip files. Of course, it's fairly rare to be able to ...
3
votes
0answers
2k views

Reverse Engineering a 8 bit CRC checksum

I am trying to create a communication interface using C Language to an Air conditioning system, after analyzing the data packets I have identified that the data packet is consist of an 8 bit CRC (I am ...
4
votes
2answers
226 views

Backtracing where a register gets initialized

I am currently trying to bypass a CRC check, that exists inline on many places in an application to check if memory pages in the .text section have been modified. Short explanation of the crc32 ...
2
votes
2answers
489 views

Single step exception at the beginning of an unrelated function

I'm reversing an application and I know for a fact it employs CRC checks, so if I modify the code, for instance hooking something, it'll be detected. The application uses a DLL which I replaced with ...