The tech giant is fighting a second round against British authorities over backdoor access to iCloud backups, with major implications for global encryption standards. The company filed a legal challenge at the Investigatory Powers Tribunal against a new Technical Capability Notice issued by the Home Office, which demands backdoor access to encrypted iCloud backups belonging to British users. ADP is Apple’s end-to-end encryption system for iCloud backups, meaning only the user holds the keys to their data. The original TCN was issued in January 2025, and Apple’s initial response was to disable Advanced Data Protection for UK users entirely. Why crypto holders should be paying attentionThe encryption Apple uses for iCloud backups is conceptually identical to the cryptographic principles that secure Bitcoin wallets, private keys, and blockchain transactions.