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An independent person will store the coding key.
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Standard privacy measures have been the removal of identifiers and coding to de-identify data; placing firewalls between those who hold the coding keys and researchers; as well as restrictions on access to research data and the requirement of research ethics approval.
After some modifications to the internal functions and a shortening of the code key size from 112 bits to 56 bits, the full details of the algorithm that was to become the Data Encryption Standard were published in the Federal Register in 1975.
For a band level distortion evaluation, the (coded) key frames need to be transformed by applying an integer DCT like transform as it happens when they are H.264/AVC encoded (which has already happened when they were H.264/AVC Intra coded).
Taking this evaluated distortion based on the coded key frames as the target distortion for the WZ frame to be coded will allow guaranteeing that the key frames and the WZ frames have a similar overall distortion whatever the video content characteristics along time.
Only the principal investigator of the study will have access to the code key.
Participants fill in digits in blank squares indexed with a letter using the code key.
Also, the code key with names and addresses of the respondents were kept at Statistics Sweden and was inaccessible for the researchers.
In 28/56 cases, there was information provided about which individual would have the code key and in 18/56 it was explained how the data would be stored.
Anonymised samples are those that have been identified earlier or coded but the identification, or the code and the code key have been destroyed, and thus there is no longer any link to the individual.
On the other hand, if the sample is coded, the clinician can send ongoing information via a third party who is the code key holder and the researcher can send information to the clinician in the same manner.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com