Security is mentioned as public interest in various GDPR provisions:

National Security: Art. 23 I a and 45 II a as well as Rec. 16 and 104 GDPR.

 

Defence: Art. 23 I b and 45 II a as well as Rec. 104 GDPR.

 

Public Security: Art. 2 II d, 23 I c/d and 45 II a as well as Rec. 19, 50, 73 and 104 GDPR.

 

Network and Information Security: Rec. 49 GDPR.