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Passkeys are a more secure and more convenient alternative to passwords for logging into a website. Your browser creates and stores a highly secure secret key and gives the website a corresponding public key. Using the public key and clever cryptographic magic, the website can subsequently prove that your bowser knows the secret key without your browser ever revealing what it is. A limitation is that you can only share passkeys between different platforms (Windows/Apple/Adroid/Linux) or different browsers if you entrust them to a cross-platform password manager.