I've heard it said that such systems may be used by militaries, where they have an organizational structure naturally-suited to large keystream distribution. U

I've heard it said that such systems may be used by militaries, where they have an organizational structure naturally-suited to large keystream distribution. Unlike e-commerce, it's no problem to physically send the proverbial officer handcuffed to a briefcase to the nuclear submarine before it submerges for 6 months. Also the messages to be secured are, um, short and... infrequent.