On April 19, the New York attorney general released a data security guide to help businesses adopt effective data security measures for protecting state residents’ personal information. The guide outlines recommendations for preventing data breaches and securing personal information, and discusses recent data security failures. Recommendations include (i) implementing strong controls for secure authentication; (ii) encrypting sensitive customer information; (iii) ensuring third-party vendors use appropriate, reasonable data security measures to safeguard customer information; (iv) maintaining inventories of assets and locations that contain customer information; (v) implementing effective safeguards to prevent “credential stuffing” attacks where usernames and passwords stolen from other online services are used in an attempt to log in to a customer’s online account; and (vi) notifying customers quickly and accurately when a data breach occurs. The guide is drawn from the AG’s experience in investigating and prosecuting data breaches.