Mac Os App Digital Signature

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On Windows, I can right-click a file and see who code signed it on the 'Digital Signatures' tab of the Properties dialog. Is there a similar way to see which publisher signed an OS X app, or details.

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Mail User Guide

You can create prepared text, called a signature, to include when you send email messages. For example, you can create one signature for your work email and another signature for your personal email.

Create signatures

  1. In the Mail app on your Mac, choose Mail > Preferences, then click Signatures.

  2. In the left column, select the email account where you want to use the signature.

    If All Signatures is selected when you create a signature, you’ll need to drag the new signature to an email account before you can use it.

  3. Click the Add button below the middle column.

  4. In the middle column, type a name for the signature.

    The name appears in the Signature pop-up menu when you write a message.

  5. In the right column (the preview), create your signature.

    You can use the Edit or Format menus in Mail to change the font or layout, turn text into links, or check spelling. To add an image, drag it into the preview area.

If you want your signature to appear after the original text of messages you reply to or forward, deselect the “Place signature above quoted text” checkbox.

Delete signatures

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  1. In the Mail app on your Mac, choose Mail > Preferences, then click Signatures.

  2. Select a signature in the middle column, then click the Remove button .

When you delete a signature from All Signatures, it’s deleted from any account that uses it.

Automatically add a signature to emails

You can choose a signature to automatically add to messages you send.

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  1. In the Mail app on your Mac, choose Mail > Preferences, then click Signatures.

  2. Select an account in the left column.

  3. Click the Choose Signature pop-up menu, then choose a signature.

    If you have more than one signature for an account, Mail can automatically alternate between them—choose At Random or In Sequential Order from the pop-up menu.

If you want to stop having a signature automatically added to your messages, click the Choose Signature pop-up menu, then choose None.

Add a signature to emails yourself

  1. In the Mail app on your Mac, click the Signature pop-up menu in the message you’re writing.

  2. Choose a signature.

    If you don’t see an expected signature in the pop-up menu, choose Edit Signatures to open Signatures preferences and verify the signature is in the account.

Remove a signature from emails

  1. In the Mail app on your Mac, in a message you’re writing, click the Signature pop-up menu.

  2. Choose None.

Depending on how a recipient’s mail server handles signatures, your signature may appear as an attachment or image to the recipient.

If you use iCloud Drive on your Mac and other devices, your signatures are automatically updated and available on those devices. See Use iCloud Drive to store documents.

If you need to send a signed PDF document, you can use Markup in Mail to create a handwritten signature and add it to the document. You can also use the Preview app to fill out and sign PDF forms.

Code signing is a macOS security technology that you use to certify that an app was created by you. Once an app is signed, the system can detect any change to the app—whether the change is introduced accidentally or by malicious code.

You participate in code signing as a developer when you obtain a signing identity and apply your signature to apps that you ship. A certificate authority (often Apple) vouches for your signing identity.

Note: In most cases, you can rely on Xcode’s automatic code signing, which requires only that you specify a code signing identity in the build settings for your project. This document is for readers who must go beyond automatic code signing—perhaps to troubleshoot an unusual problem, or to incorporate the codesign(1) tool into a build system.

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Benefits of Code Signing

After installing a new version of a code-signed app, a user is not bothered with alerts asking again for permission to access the keychain or similar resources. As long as the new version uses the same digital signature, macOS can treat the new app exactly as it treated the previous one.

Other macOS security features, such as App Sandbox and parental controls, also depend on code signing. Specifically, code signing allows the operating system to:

  • Ensure that a piece of code has not been altered since it was signed. The system can detect even the smallest change, whether it was intentional (by a malicious attacker, for example) or accidental (as when a file gets corrupted). When a code signature is intact, the system can be sure the code is as the signer intended.

  • Identify code as coming from a specific source (a developer or signer). The code signature includes cryptographic information that unambiguously points to a particular author.

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  • Determine whether code is trustworthy for a specific purpose. Among other things, a developer can use a code signature to state that an updated version of an app should be considered by the system to be the same app as the previous version.


Limitations of Code Signing

Code signing is one component of a complete security solution, working in concert with other technologies and techniques. It does not address every possible security issue. For example, code signing does not:

  • Guarantee that a piece of code is free of security vulnerabilities.

  • Guarantee that an app will not load unsafe or altered code—such as untrusted plug-ins—during execution.

  • Provide digital rights management (DRM) or copy protection technology. Code signing does not in any way hide or obscure the content of the signed code.

See Also

Read Security Overview to understand the place of code signing in the macOS security picture.

Mac Os App Digital Signature Card

For descriptions of the command-line tools for performing code signing, see the codesign and csreq man pages.

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