Today I can only imagine the challenges of keeping secrets secret when it comes to sharing information electronically. This is especially true with the widespread use of email for sharing information between organizations.
What we need are simple, intuitive tools that enable the sharing of information--but one that makes us think before we hit the "send" button. One such software I came across is from Titus which has a family of software applications that can help organizations like Fusion Centers and other law enforcement and security organizations manage their classified communications.
See Titus Desktop Solutions for some ideas on what tools might be available.