Simplify the following text for a Grade 13 native English-speaking person.
Original: The Communications Security Establishment Canada ( CSEC or CSE ) ( French : Centre de la sÃ curitÃ des tÃ lÃ communications Canada ) ( CSTC or CST ) is the Canadian government 's national signals intelligence agency .
Simplified: The Communications Security Establishment Canada ( CSEC or CSE ) ( CSTC or CST ) is the Canadian government 's national cryptologic agency .