If you own a Windows XP or Windows 7 PC that’s been hit by the WannaCry ransomware, there’s good news: French researchers have created a software utility called wanawiki that can potentially unlock an infected PC.

Matt Suiche, the founder of CloudVolumes and Comae, published a blog post that describes how Benjamin Delpy’s wanawiki tool works: It sniffs out the prime numbers used by the ransomware to reconstruct the key used to encrypt your PC. Once the wanawiki tool is run, the software can basically generate the key, and the tool will then unlock the encypted files.

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Wanawiki is the WannaCry fix that might save affected PCs—if you work fast