ZipCrypto vs WinZip AES
A .zip extension does not tell you how the file is protected. Legacy ZipCrypto and WinZip AES differ in design, in what metadata stays visible, and in which evidence is useful when a password is forgotten.
The practical difference
ZipCrypto is the older PKZIP-compatible method. Its historical weaknesses mean a matching unencrypted file may open a known-plaintext route. WinZip AES uses a modern AES-based design with authentication and has no equivalent shortcut.
Neither method makes a random password predictable. The encryption label changes the available workflow; password entropy still controls the size of the candidate space.
Legacy
ZipCrypto
Modern
WinZip AES
Shortcut
Only format-specific
Proof
Authentication + files
How to identify the method
Use local archive metadata and a trusted utility. A method marker in the ZIP entry is stronger evidence than the creation date, the extension, or which application opened the file. Some archives contain entries with different protection states, so inspect the entry you actually need.
If the archive cannot be parsed, diagnose corruption or a missing part first. A failed parser cannot reliably tell you which encryption was intended.
Choose a recovery path
For ZipCrypto, look for matching unencrypted material before building a large password list. For AES, focus on password history and a bounded candidate list. For both, verify by extracting expected files — a visual preview is not proof.
Frequently asked questions
Which is stronger, ZipCrypto or AES?
Can I convert ZipCrypto to AES without the password?
Why can a ZIP list filenames but not extract?
Need a second opinion on this file?
Run the free local check first. If the file is healthy and you are authorized to recover it, you can compare the evidence with a specialist's supported workflow.
Related guides
For authorized owner use only. Recovery depends on the exact file and password; no outcome is guaranteed. FilesUnlock is a separate product from the recovery service that processes submissions.