US Patent 11362822 Shared keys based on multiple features

A method for secret sharing utilizing multiple features of an input includes: receiving a registration input; obtaining features from the registration input; generating a secret key and a plurality of shared keys according to a shared secret scheme; associating each of the plurality of shared keys with a respective feature of the registration input; generating a plurality of additional features associated with additional keys having a similar format as a shared key associated with a respective feature; storing the plurality of shared keys associated with respective features together with the plurality of additional keys associated with additional features; and encrypting an element to be protected by the secret key using the secret key.