How is Cyber Security Changed with the GDPR?

Security was radically changed under the GDPR. Security processes have to be drastically re-engineered. Because of much shorter data breach response timelines, companies will have to look at transforming their traditional security approaches to include much more automation.
A typical enterprise company has many thousands of threats going on at any moment in time. Even for small businesses, data breaches do happen. You are going to need to have in place the tools and processes to quickly assess what data was affected by a breach.