Sony required customers to reset their passwords by either using the same PlayStation 3 device they originally used to register or through validated e-mail. In April, a sophisticated hack exposed the personal information of at least 77 million customers. Sony is applying advanced security technology, increasing levels of encryption, adding firewalls and implementing early warning systems to detect attacks on network. Sony announced two weeks ago it would name its first chief information security officer as a way to strengthen IT security. “We felt that we owed it to you to fully verify the security of the networks before restoring our services,” a Sony executive says.”]
Source: https://www.cuinfosecurity.com/sony-begins-playstation-restoration-a-3641