Signed software is an application that includes a digital signature from the publisher or code signer. The signature helps operating systems and security tools confirm that the file has not been altered since it was signed and that it came from a trusted identity. It does not guarantee the software is safe, only that the package matches the signer’s certificate.
In cyber security, signed software matters because attackers often abuse trust signals. A valid signature can make a remote support tool, installer, or updater look legitimate to users and may reduce suspicion in some defenses. That is useful in social engineering attacks where a victim is persuaded to install a trusted program that is then controlled by the attacker. Defenders should verify the request, the publisher, and the installation workflow, because “signed” means authenticated, not harmless.