Certificate authority (CA) A certificate authority is an entity similar to a notary public. It issues digital certificates, signs certificates to verify their validity and tracks which certificates have been revoked or have expired. Top of Page Digital signature assurances The following terms and definitions show what assurances are provided by digital signatures. Authenticity The signer is ...

About digital signatures and certificates in Office, and buying a digital certificate from a certificate authority or create your own.

See how to view the details for signatures and certificates.

Want to add a padlock to your email messages? You can use encryption and digital signatures in new Outlook, classic Outlook, and Outlook on the web for work or school accounts to increase the security of messages. Encrypting an email message in Outlook means it's converted from readable plain text into scrambled cipher text. Only the recipient who has the private key that matches the public ...

How to create or edit your Outlook signature for email messages. Include your signature, text, images, electronic business card, and logo.

Use a ready signature template from a gallery to create your email signature in Outlook.

Whether it’s a new job title (congratulations!) or a phone number change, make sure you keep your email message signature up-to-date. If you're using new Outlook, for more information about email signatures, or if you haven’t created one yet, see Add a signature to messages. Select File > Options > Mail > Signatures. Select the signature you want to edit, and then make your changes in the ...

How to add a signature to your Word documents. You can also use the Signature Line command in Word to insert a line to show where to sign a document.

This article describes how you can digitally sign a macro project on Windows by using a certificate. If you don't already have a digital certificate, you'll need to get one.

If you don't have another email account that you can access, you can create a temporary outlook.com account for free by selecting Create one at the Microsoft account sign in page. Note: The working email account you provide will only be used to contact you about your account recovery form and won't be used for any other purpose.