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A tool for parsing and decrypting MS-CHAPv2 network handshakes.

  1. Obtain a packet capture with an MS-CHAPv2 network handshake in it (PPTP VPN or WPA2 Enterprise handshake, for instance).

  2. Use chapcrack to parse relevant credentials from the handshake (chapcrack parse -i path/to/capture.cap).

  3. Submit the CloudCracker token to

  4. Get your results, and decrypt the packet capture (chapcrack decrypt -i path/to/capture.cap -o output.cap -n )

Bug tracker

Have a bug? Please create an issue here on GitHub!


Copyright 2012 Moxie Marlinspike

Licensed under the GPLv3: