Shifenzheng.bak

This article dives deep into the technical origins, security implications, forensic significance, and legitimate (and illegitimate) uses of shifenzheng.bak .

The database contained sensitive details of 20 million people, including names, gender, birthdays, home addresses, mobile numbers, email addresses, and official ID numbers. shifenzheng.bak

Search results indicate this file name is often bundled or mentioned alongside "cracks," "activators," and "keygen" tools for various software like FluidSim or Avast. This suggests it may be part of malicious packages or used as a placeholder in directories for pirated materials. This article dives deep into the technical origins,

shifenzheng.bak refers to a prominent 2013 data leak involving the personal information of approximately 20 million Chinese hotel guests. The filename literally translates to "ID card backup" (身份证 - shēnfènzhèng This suggests it may be part of malicious

Before the era of cloud synchronization, small hotels and internet cafes in China used standalone Windows XP or Windows 7 PCs with local databases (often Paradox or early MySQL). To avoid data loss during power outages, the guest registration software would automatically generate a shifenzheng.bak in the installation directory every time a guest checked in. Because system administrators rarely cleaned these folders, the .bak files accumulated thousands of plaintext ID cards over years of operation.

Several trends suggest a decline:

It was a scan of his national ID card — front and back — saved years ago when he first applied for a loan. He never deleted it. "Just in case," he told himself.