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The host calculates the Protected Area Key (Kpa) as follows: Kpa = AES-G(Km, Binding_Nonce) 9. The host encrypts the Data associated with Protected Area (D) using Kpa as specified in the Recordable Video book of this specification. 10. The host requests to write the encrypted Data associated with the Protected Area (ED) as a user data file whose LBA extent was specified in step 2. 91 Page 37 Advanced Access Content System: Introduction and Common Cryptographic Elements 11. Upon receiving the write request the drive writes the encrypted Data associated with the Protected Area (ED), the Binding Nonce, and the association between the two to the media.
The command data includes the LBA extent with which to associate the new Binding Nonce. 3. The drive generates the Binding Nonce and caches it along with the LBA extent from step 2. 4. 3. Dm = CMAC(BK, Binding_Nonce || Starting_LBA) 5. The drive sends the newly created Binding Nonce and the message authentication code Dm calculated in step 4 to the host. 6. 3. Hm = CMAC(BK, Binding_Nonce || Starting_LBA) 7. The host verifies if the Dm received in step 5 matches the Hm calculated in step 6. If the verification fails, the host shall abort the current write operation.
1. When the loaded disc is not AACS compliant media, this command with Key Format = 0000012 shall be terminated with CHECK CONDITION Status, 5/6F/01 COPY PROTECTION KEY EXCHANGE FAILURE – KEY NOT PRESENT. 3 Returning Drive Key Table 4-9 shows the format of the data returned by the REPORT KEY command when Key Class of 0216 and Key Format of 0000102 are used. 3. The REPORT KEY Data Length field specifies the length in bytes of the following REPORT KEY data that is available to be transferred to the host.
AACS Introduction and Common Cryptographic Elements
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