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Extra resources for AACS Introduction and Common Cryptographic Elements

Sample text

6. The host generates 160 bits random number as nonce Hn 7. The host sends the nonce Hn generated in step 6 and the Host Certificate to the drive. 91 Page 32 Advanced Access Content System: Introduction and Common Cryptographic Elements 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. The drive checks if the value of the Certificate Type is 0216 and the value of the Length is 005C16 in the Host Certificate. If these checks fail, the drive shall determine the host is not compliant and shall abort the drive authentication procedure.

The first MKB Pack shall be addressed as MKB Pack number 0000000016 and the nth MKB Pack shall be addressed as MKB Pack number n-1. The last MKB Pack may end with unused bytes, which shall be zero-filled. The MEDIA KEY BLOCK Pack Data field returns the requested MKB Pack. The MEDIA KEY BLOCK Pack Data length is 32,768 and the DISC STRUCTURE Data Length is 800216. 4 SEND KEY Command Extensions The SEND KEY command with Key Class 0216 is used for AACS. The SEND KEY command with Key Class 0216 provides data necessary for authentication and for generating a Bus Key and ends the authentication process.

The host sends a request to the drive to generate a new 128-bit Binding Nonce that will be written into the Protected Area. 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.

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AACS Introduction and Common Cryptographic Elements

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