RSA has started providing more detail into the mid-March attack on its SecurID token-based authentication system. Sources say RSA is reaching out to its largest customers, especially those in sensitive industries, to get them to sign such NDAs. Some RSA customers say they aren’t willing to do that. “I’m suspicious. Why hide it?” says Ron Gula, CEO of Tenable Network Security, who uses RSA tokens for authentication, says he doesn’t want to feel his hands tied by agreeing to an NDA.”]