Patent ID: 7650498

Claim:
A secure data-provision method for providing target data from a data provider to a party purporting to be a specific, professionally-accredited, individual engaged by a specific accredited organization, the target data being provided in encrypted form as part of a data set; the method comprising: encrypting a first item, by a processor executing an Identifier-Based Encryption, IBE, scheme, in dependence on encryption parameters comprising a first encryption key string that identifies said specific individual, and public data of a first trusted authority competent in respect of professional accreditations; and encrypting a second item, by a processor executing an IBE scheme, in dependence on encryption parameters comprising a second encryption key string that identifies said specific organization, and public data of a second trusted authority competent in respect of accreditations of organizations; and forming said data set using at least the encrypted first and second items; recovery of the target data in clear requiring decryption of both the first and second items.