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macOS User Guide
- Welcome
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- Use Continuity across your devices
- Use your iPad as a second display
- Hand off between devices
- Insert photos and scans from iPhone or iPad
- Insert sketches from iPhone or iPad
- Copy and paste between devices
- Use Apple Watch to unlock your Mac and approve requests
- Make and receive phone calls on your Mac
- Control accessories in your home
- Send files between devices with AirDrop
- Use AirPods with your Mac
- Stream content to Apple TV
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- Understand passwords
- Use keychains to store passwords
- Reset your Mac login password
- Set up your Mac to be secure
- Guard your privacy
- Protect your Mac from malware
- Use Sign in with Apple for apps and websites
- Clear your Safari browsing history
- Manage cookies and other website data in Safari
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
What is a digital identity?
A digital identity is an electronic way of identifying someone. It consists of a certificate containing a “public key,” which is viewable, and a “private key,” which is kept secret.
Your private key lets you sign an electronic document with a signature that others can verify using only your public key. Likewise, your private key can decrypt documents that were encrypted by others using your public key.
For a digital identity to be accepted as a valid item, it needs to be trusted by the recipient. To help ensure the authenticity of a digital identity, certificate authorities supply digital identities to individuals whose identities have been verified. See What’s a certificate?
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