The Titanic was supposed to be unsinkable too. IMHO there is no level of encryption that can't be cracked given enough time and desire. Right now I would say this type of communication would be very secure, but to think it will always stay secure would be foolish.
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You've got to get over the encryption seduction of computer communications. Computer communication is the LEAST secure method of communicating with other people covertly. Encryption cannot protect ANYTHING on the internet. There are at least two major vulnerabilities to internet communications. First,mechanically, email communications can be recorded, and are recorded, in your computer. Even if you delete them, they're still in there, and the FBI (being the least technically capable of the agencies) can often pull them back out and reconstruct them. Secondly, systemically, it is impossible to know ho much of your electronic communication is recorded by the ISP, by agencies monitoring the web, etc. Even if you encrypt what you send, it is basically out there forever for someone to decrypt; which means that you are relying on today's encryption to protect you from tomorrows decryption programs. Additionally, you don't know that the programmers putting together encryption software haven't given the gummint the keys and backdoors to decrypt your stuff when the DHS agent comes and says it's a "matter of national security"...
The best way to communicate covertly is old school. Face to face in the middle of nowhere, or using a private code that only you know, etc. The very best means is to stay under the radar and to not be suspected in the first place. While that may be impossible for people who are psyops or propagandists, due to the nature of the work, it is relatively easy for their friends.
I don't think this is so much an explanation of VoIP as it is VoIP *networks*. The "asterisk" software that's described can be used to replace an office phone system. Except that the "office" with this network doesn't have to be confined to one building. The office can be virtual with each cubicle located anywhere in the world.
The author makes the point that as long as he is only communicating with people tied into his virtual phone network, the communications never enter the standard telephone grid, and therefore doesn't pass the fed's wire tappers. In fact I don't think he can call into the phone grid from his network phone unless I missed that.
What's interesting to me is the likelihood that two of these virtual networks (i.e. two "businesses" each with their own internet based phone servers or phone "centers"), might be free to interact with one another without going through the telephone grid. If so, then the stage is set for the complete demise of the telephone grid itself, as all phone communications would/could just be made from one internet phone server to another internet phone server just like email today never enters the phone grid. All transpires solely over the internet.