During May-June 2016 a series of major and massive data breaches emerged exposing hundreds of millions of user e-mails and passwords (in hashed or plaintext form). The data were originally sold on the black market, but soon a lot of them became public. Interestingly, all these data breaches are dated a few years back, but they were only disclosed recently, remaining within private circles for years. Following these data breaches a wide range of attacks on well-known websites occurred as a result of users reusing their passwords across them. This Info note provides insight on the data breaches themselves, their impact on other websites and provides recommendations to respond and limit the impact of such data breaches.
https://www.enisa.europa.eu/publications/info-notes/massive-data-breaches
L' INTELLIGENCE CYBER par Jean-Paul Pinte 
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