Everybody knows not to store sensitive information in unencrypted files, right? PDFs and ZIP files can often contain a treasure trove of information, such as network diagrams, IP addresses, and login credentials. Sometimes, even certain files that are encrypted aren't safe from attackers. That's where Zydra comes in — a tool for cracking RAR files, ZIP files, PDF files, and Linux shadow files.
How Are These Files Encrypted?
Depending on the program used and its version, these sorts of files could be password protected using various encryption algorithms.
For example, the Linux command line zip utility uses the older PKZIP algorithm, which is insecure and easy to crack. Other programs, like WinZip and 7-Zip, use strong AES-256 encryption. Earlier versions of the RAR protocol use a proprietary encryption algorithm, while newer versions use AES. WinRAR and PeaZip, popular choices that can deal with RAR files, also use the AES standard.
If you're using Linux, it's easy to create PDFs in LibreOffice by exporting regular word documents, and there's even an option to password protect the newly created file. Older versions of LibreOffice use the Blowfish algorithm to encrypt files, but versions 3.5 and up use AES. Other methods to create PDF files include Microsoft Office and Adobe Acrobat — Office versions 2007+ and Acrobat versions 7+ all support AES encryption.
Linux shadow files themselves are not encrypted, but the pass ..
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