Patent ID: 7484104

Claim:
An information processor which implements a service by cooperatively operating at least first and second job processors, the first job processor to execute a first job processing in accordance with a first process description defined in instruction data, the second job processor to execute a second job processing, which is a different type of processing from the first processing, in accordance with a second process description defined in the instruction data including the first process description, the information processor comprising: an encryption processor which encrypts the first and second process descriptions defined in the instruction data so that the first process description is decryptable for the first job processor and is not decryptable for the second job processor, and so that the second process description is decryptable for the second job processor and is not decryptable for the first job processor, and a transmitter which sends the instruction data, in which the first and second process descriptions are encrypted by the encryption processor, to at least one of the first and second job processors, wherein, when the instruction data instructs the second processing to be carried out later than the first processing, the encryption processor encrypts the second process description using a second public key corresponding to a private key of the second job processor, and further encrypts the first process description and the second process description encrypted by the second public key using a first public key corresponding to a private key of the first job processor.