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The best way to authenticate a signature is to compare it to a known sample. If you have access to a previous document signed by the same person, compare the signatures side by side. Look for similarities in the writing style, stroke patterns, and overall appearance.

In order to validate E-sign in Adobe acrobat reader, click on the eSign marked in red box. Once the user clicks on the image he will be prompted with the following window (Signature Validation Status). Click on the Signature Properties button to check signature properties.

Signature validity is determined by checking the authenticity of the signature's digital ID certificate status and document integrity: Authenticity verification confirms that the signer's certificate or its parent certificates exist in the validator's list of trusted identities.

Definitions: The (mathematical) verification of the digital signature and obtaining the appropriate assurances (e.g., public key validity, private key possession, etc.).

To detect whether the assembly file is signed or not, right click on the file and click the 'Properties' from the context menu. If you see a 'Digital Signatures' tab in the properties window, that means, the file is signed by a digital signature (as shown below).

Right-click the EXE or MSI file and select Properties. Click the Digital Signatures tab to check the signature.

From a Windows operating system: Right-click the .exe of the program in question and select Properties. Select Digital Signatures. Under Signature List, select the Signature, and click Details.

Step 1: Open a terminal. Step 2: Use the 'gpg' command to check the signature. The 'gpg' command is usually pre-installed in most Linux distributions. If you don't have it, it using the package manager specific to your distribution.