Organisation internationale de normalisation

Summary of discussions

1. m34946 Proposed enhancements to 23001-7:AMD for pattern based encryption mode

Thank you. We think that the operation of counter and CBC modes should be in the ‘tools’ chapter, and shorten the ‘modes’ chapter. Given that this amendment text has not in fact, issued, we think we should ballot a 3^rd edition DIS from this meeting.

We think that pattern-based encryption of non-video NALs is both dangerous and weak; dangerous because it may make predicting the clear text, and hence cracking, easier. Weak, because predicting the encrypted 10% may be very easy. We remove the possibility of protecting CryptNonVideoNalTypes and add a note why this is not possible instead, likewise for the current cenc text (see inline comment).

We need to integrate m35133 below. We need text in part 12 to say what happens to the codecs sub-parameters for protected content.

Since the PDAM for amd2 has not issued, we issue a DIS of 3^rd edition after an editing period (3 weeks).

2.