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2 Protocol for Reading Protected Area Data The Protected Area Data is read by the host using the following procedure. Figure 4-11 shows the protocol flow of reading the Protected Area Data. AACS Optical Drive Host AACS-Auth Request to read Protected Area Data with specifying LBA extent If AACS-Auth successful If AACS-Auth successful Read Binding_Nonce from the media Calculate Dm = CMAC(BK, Binding_Nonce || Starting_LBA) Binding_Nonce || Dm Request to read the encrypted data with specifying the LBA extent Write the encrypted data, Binding_Nonce and the association between the two to the media Calculate Hm = CMAC(BK, Binding_ Nonce || Starting_LBA) Verify Dm == Hm Calculate Kpa = AES-G(Km, Binding_Nonce) Encrypted Data (ED) Decrypt data associated with Protected Area using Kpa Figure 4-11 – Protocol Flow of reading Protected Area Data 1.

Bytes 4 through 19 return the 128-bit Pre-recorded Media Serial Number value. 5. When the logical unit has not established a Bus Key for the authentication process, this command with Format Code = 8116 shall be terminated with CHECK CONDITION Status, 5/6F/02 COPY PROTECTION KEY EXCHANGE FAILURE – KEY NOT ESTABLISHED. 6. 91 Page 47 Advanced Access Content System: Introduction and Common Cryptographic Elements The DISC STRUCTURE Data Length field specifies the length in bytes of the following DISC STRUCTURE data that is available to be transferred to the host.

2. 1. 3. 2 and verify that the new value is not the same value that was retrieved and cached in Step 1. If the Binding Nonce has not been correctly updated, then the host shall abort the procedure that necessitated the update of the Binding Nonce. 1 Protocol for Writing Protected Area Data The Protected Area Data is written using following procedure. Figure 4-10 shows the protocol flow of writing the Protected Area Data. 91 Page 36 Advanced Access Content System: Introduction and Common Cryptographic Elements AACS Optical Drive Host AACS-Auth Request to generate Protected Area Data with specifying LBA extent If AACS-Auth successful If AACS-Auth successful Generate Binding_Nonce Calculate Dm = CMAC(BK, Binding_Nonce || Starting_LBA) Binding_Nonce || Dm Request to write the encrypted data with specifying the LBA extent Write the encrypted data, Binding_Nonce and the association between the two to the media Calculate Hm = CMAC(BK, Binding_ Nonce || Starting_LBA) Verify Dm == Hm Calculate Kpa = AES-G(Km, Binding_Nonce) associated with Protected Area using Kpa Encrypt data Encrypted Data (ED) Figure 4-10 – Protocol Flow of writing Protected Area Data 1.

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