Short Answer 
The first steps after a data breach involve notifying the authorities to initiate an investigation, documenting all relevant details about the breach, and informing affected individuals so they can take protective actions. It’s crucial to also remove any compromised personally identifiable information from the system to prevent further risks.
Step 1: Notify Authorities
Upon discovering a data breach, your first action should be to notify the proper authorities. This includes local law enforcement or regulatory agencies depending on your jurisdiction. By informing them, you initiate a formal investigation and alert responsible parties to take necessary actions and measures against the ongoing breach.
Step 2: Document the Details
Next, it is important to document the breach’s details meticulously. Record when and where the breach was discovered, its nature, and the specific data that was compromised. This documentation will be invaluable for law enforcement investigation and for any required reporting to regulatory bodies.
Step 3: Notify Affected Individuals
Lastly, notify individuals whose data has been compromised. This disclosure allows them to take protective measures against potential risks such as identity theft. In your notification, include steps they can take like changing passwords or monitoring financial accounts. Additionally, ensure to remove all Personally Identifiable Information (PII) from the affected system to prevent further unauthorized access.