Need 400 words By October of 2017, Yahoo estimated that 3 billion user accounts were compromised. Users' passwords in clear text, payment card data and bank information were not stolen. Yet, it remains one of the largest data breaches. What that teach us as a security professional and as regular user ? .

1. Need 400 words
By October of 2017, Yahoo estimated that 3 billion user
accounts were compromised. Users' passwords in clear text,
payment card data and bank information were not stolen. Yet, it
remains one of the largest data breaches.
What that teach us as a security professional and as regular user
?