Patent ID: 11863671
Assignee: APPLE INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 21:
22. A non-transitory machine-readable medium storing instructions to cause one or more processors on an electronic device to perform operations comprising:
splitting an account recovery key into multiple key portions, wherein the account recovery key is to enable recovery of an account associated with the electronic device;
receiving an encryption key from an accessory device associated with the electronic device, wherein the encryption key is signed with an attestation key;
verifying authenticity of the accessory device with the signed encryption key;
encrypting a portion of the account recovery key using cryptographic material derived from the encryption key, wherein the encrypting the portion of the account recovery key includes to:
generating an ephemeral key pair;
computing a first portion of the cryptographic material based in part on a first key of the ephemeral key pair and the encryption key;
computing a second portion of the cryptographic material based in part on a second key of the ephemeral key pair and the first portion of the cryptographic material; and
encrypting the portion of the account recovery key using the second portion of the cryptographic material; and

providing an encrypted portion of the account recovery key to a server associated with a user account associated with the electronic device.