Developers can call a local refresh API (getCredentialsState) to confirm that the user is still securely signed in to iCloud on the device and allow the use...

https://www.apple.com/jp/privacy/docs/Sign_in_with_Apple_White_Paper_Nov_2019.pdf

These malicious apps, if installed, lock users out of their phone or target their photos, unless they agree to pay a ransom.10,11 Android users have been tr...

https://www.apple.com/jp/privacy/docs/Building_a_Trusted_Ecosystem_for_Millions_of_Apps.pdf