Handling substream dependencies in authenticating video data streams

Abstract

Abstract An apparatus for checking a video data stream on trustworthiness derives a number of substreams of a predetermine temporal segment out of a sequence of temporal segments, in units of which the video data stream is checkable on trustworthiness, and further derives 5 dependency information, which indicates, for the substream, whether the substream is dependent or whether the substream depends on one or more reference substreams. The trustworthiness check is performed by forming a verification stream based on a hash value, which is obtained from a portion of the substream to be verified and based on a reference hash value. If the substream is independent, a hash value derived for a corresponding 10 substream of the preceding temporal segment is used as the reference hash value. Abstract 5 10 20 26 20 02 56 15 J an 2 02 6 A b s t r a c t 2 0 2 6 2 0 0 2 5 6 1 5 J a n 2 0 2 6 1 / 7 FI G 1 14 13 1 13 1 13 2 13 2 17 * 17 17 ' 21 43 1 30 13 1 31 33 4941 20 45 51 35 48 FIG 1 15 E 08 48 35 33 13 S S 43 49 S 45 11 21 20 17' * 11 17 13 13 13 13 14 20 26 20 02 56 15 J an 2 02 6 3 1 S S * 2 0 2 6 2 0 0 2 5 6 1 5 J a n 2 0 2 6

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