| http://www.w3.org/ns/prov#value | - For instance, if PK is a signature public key, the door may ask to have signed a given message and the right user???the only one who knows the corresponding secret signing key SK-may provide the correct requested signature; if PK is a public encryption key, the door may request to a have a given challenge ciphertext decrypted, which can be done by the right user, who knows the correspon
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