Glossary.md

@@ -6,7 +6,12 @@ This page lists PEP's key concepts and terminology, and provides concise descrip
 | download | The retrieval of data from PEP. |
 | Data Administrator | The PEP role responsible for data structuring and management. |
 | encryption | A technique to make information readable only to parties that are in possession of an associated secret. |
+| identifier | A piece of information that uniquely denotes a single data row. |
+| local pseudonym (LP) | A row identifier that is unique to an access group. Different access groups use different local pseudonyms to refer to the same row. |
+| participant | A subject in an academic research study. The term is commonly used in PEP software and documentation as a synonym for a data row. |
 | PEP | A data storage system that provides polymorphic encryption and pseudonymization. |
+| polymorphic pseudonym (PP) | A row identifier that is partially randomized. While any PP refers to a single row, a row is not uniquely associated with a single PP. |
 | pseudonymization | The process of making information difficult to associate with any particular person or data entry. Commonly achieved by replacing personally identifying information by meaningless identifiers. |
 | row | A data structuring primitive associated with a single entity or data subject. |
 | upload | The storage of data in PEP. |
+| user pseudonym | An abbreviated form of the local pseudonym. |
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