Unsign | Signtool

– Tools like delcert (from the cffexplorer suite) or pesign (Linux) can wipe the attribute certificate table.

It is critical to note that any removal method breaks the file’s integrity proof and invalidates any associated trust decisions by Windows SmartScreen, antivirus software, or code integrity policies. signtool unsign

If you have opened a command prompt, typed signtool unsign , and hit enter, you were likely met with an error. The reason is simple: Microsoft’s SignTool does not have an "unsign" command. – Tools like delcert (from the cffexplorer suite)

: The cleanest way to get an unsigned version is to re-compile the source code without the signing step. Third-Party Tools The reason is simple: Microsoft’s SignTool does not

You have an old DLL signed with a certificate that just expired. You have a new certificate, but when you try to sign the existing file, you get an error: SignTool Error: This file is already signed. You must unsign it first. Most developers don't realize that signtool will not overwrite an existing signature. You cannot "stack" signatures unless you're using a dual-signature (SHA-1 + SHA-256) method. To replace a signature, you must first .

The design assumes that signatures are permanent proof of provenance. There is no reversible unsign operation because cryptographic signing is a one-way transformation: once the hash is signed and embedded, removing it without breaking file integrity is not an atomic, standardised operation. Instead, to “unsign,” one must alter the binary to discard the signature table—something SignTool deliberately avoids to prevent accidental security degradation.