@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix edu: <https://knobit.org/def/> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix schema: <https://schema.org/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://knobit.org/id/task/dsec-classification/C2> a edu:Question ;
    rdfs:label "C2 (2 points)"@en ;
    dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
    schema:hasPart <https://knobit.org/id/register/data-security#SE-203>,
        <https://knobit.org/id/register/data-security#SE-204> ;
    schema:identifier "C2" ;
    schema:position 2 ;
    schema:text "Pseudonymous is not anonymous, 1 each. (a) card_txn_analytics.customer_hash, an unsalted SHA-256 of the personal identification code labelled 'anonymous' and public, is pseudonymised personal data (GDPR recital 26; an 11-digit code with a known structure is reversible by brute force): confidential, personal, at least. (b) merchant_day_spend.total_amount, grouped by merchant and day, is public although cells hold a single customer: not anonymous; a minimum group size with small cells suppressed, or a higher level."@en .

edu:Question rdfs:label "Question"@en,
        "Küsimus"@et .

<https://knobit.org/id/register/data-security#SE-203> rdfs:label "dsec-classification C2: the hashed personal code is pseudonymous, not anonymous"@en .

<https://knobit.org/id/register/data-security#SE-204> rdfs:label "dsec-classification C2: the merchant-by-day aggregate has cells of one customer"@en .