Espionage 是一款非常专业的个人文件夹加密软件。就连美国国家安全局（NSA）都表示它可用来保护绝密机密资料！

Espionage v3.x Mac OS X | 4.2 MB

More than just encryption, Espionage 3 has been rewritten from the ground-up to combine folder encryption with layers of plausible deniability through a redesigned and simplified user interface. We've taken all the lessons that we've learned from previous versions to bring Espionage 3 to a new level. Encryption is nice, but what happens if you're forced to give up your password? Espionage 3 protects you even in this situation, by giving you the ability to have multiple master passwords, each protecting a unique set of folders.