The First Seventy-Two Hours: Data Breach Notification and What the Law Actually Requires
By Casey Scott McKay ·
A data breach is a legal problem disguised as a technical one, and most of the mistakes are made in the first three days by people trying to be helpful. This article explains what actually triggers a notification obligation, why the definition of personal information differs across fifty states and why that matters, and how the risk-of-harm analysis and the encryption safe harbor narrow the obligation in practice. It covers the timing rules and the shortest deadlines that set the schedule for everyone, the required content of a notice, and the separate obligations to attorneys general, credit reporting agencies, and regulators. It then addresses the sector rules that override the state analysis, the securities disclosure obligation, ransomware and its particular questions, and how privilege over the forensic investigation is preserved or lost. It closes with the litigation that follows.
IP and Technology > Privacy Data Security | Article | Published 28 May 2024 - Updated 13 April 2026 | Casey Scott McKay - marksy.us
Summary. A data breach is a legal problem disguised as a technical one, and most of the mistakes are made in the first three days by people trying to be helpful. This article explains what actually triggers a notification obligation, why the definition of personal information differs across fifty states and why that matters, and how the risk-of-harm analysis and the encryption safe harbor narrow the obligation in practice. It covers the timing rules and the shortest deadlines that set the schedule for everyone, the required content of a notice, and the separate obligations to attorneys general, credit reporting agencies, and regulators. It then addresses the sector rules that override the state analysis, the securities disclosure obligation, ransomware and its particular questions, and how privilege over the forensic investigation is preserved or lost. It closes with the litigation that follows.
Keywords: data breach notification, personal information definition, acquisition versus access, risk of harm analysis, encryption safe harbor, state notification statutes, attorney general notification, credit reporting agency notice, substitute notice, notification content, notification timing, HIPAA breach rule, GLBA notification, SEC cybersecurity disclosure, forensic investigation, privilege, incident response plan, vendor notification obligations, ransomware, class action exposure
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