Changes

== Rationale ==

== Rationale ==

If you simply give the anonymous PPN to your participants, they can also identify themselves, but the PPN will have to be sufficiently long and random to make sure the participant cannot guess someone else's PPN as well. If you generate PPN the same way for every experiment, then anyone who knows how you do it for one experiment can do it for another and pretent to be a participant.

If you simply give the anonymous PPN to your participants, they can also identify themselves, but the PPN will have to be sufficiently long and random to make sure the participant cannot guess someone else's PPN as well. If you generate PPN the same way for every experiment, then anyone who knows how you do it for one experiment can do it for another and pretend to be a participant.

 

== Technical Details ==

== Technical Details ==

The PIC is the capitalized hexadecimal four character representation of the first two bytes of the SHA256 hash of the concatenation of the UTF-8 representation of the Experiment Secret and the Participant Number.

The PIC is the capitalized hexadecimal four character representation of the first two bytes of the SHA256 hash of the concatenation of the UTF-8 representation of the Experiment Secret and the Participant Number.