Fiserv Prologue uses a static encryption key across all installations. PrologueDecrypt is an offensive security C# tool designed to decrypt the database passwords located in Prologue config files.
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Download PrologueDecrypt
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Register the required crypto COM library as an admin user
regsvr32 IPSCrypto.dll -
Open up PrologueDecrypt.sln in Visual Studio (was tested using Visual Studio 2019) and build.
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Run PrologueDecrypt.exe passing the encrypted string without the @ symbol at the start of the string.