I'm also pretty sure that merely improving a mixnet won't make something NSA proof either. The threat model is much wider than that.
Yes there are many possible vulnerabilities. I've been thinking about these for 2 years. I am a "can do" person. Now less words, and more "do".
I would like to read their response and how you plan to improve the functionality as this is a huge opportunity to improve financial privacy.
Give me 6 weeks to produce an alpha-stage product and a white paper, if I decide to proceed on improving the anonymity network as the first priority (which looks to be the likely decision as it helps everyone and is less confrontational than creating an altcoin first).
Electromagnetic shielding around your computer can defeat this.
If the NSA has determined your location, you are already probably toast.
They key about IP obfuscation anonymity mixing is the NSA not knowing who is doing what.
I plan to be retired by the time the NSA starts trailing me. My essential work will be done over the next several months, then turned over to other devs to carry on. I need to make sure ALL of those other devs can not be identified.
As for future-proofing, then wider keys such as 512-bit ECC and super singular isogenies against quantum computing can be considered.
Theoretically mixmaster should provide good enough anonymity if
used with pgp. Most Linux based mailers eg Mutt, include hooks to
process both pgp and transmit via mixmaster.
For Mixmaster to be effctive, messages (encrypted) are passed though
several mailhosts and eventually delivered (encrypted) anonymously
to the recipient.
Regrettably, any encrypted message or any posts to remailers are
going to be like walking around with a ladder on your shoulder in
a thunderstorm.
If things are really that bad, emigration might be the best option.
Is mixmaster even a reality? I can't find any info about a network of servers offering that functionality.
Mixmaster is not a properly designed solution. Period. I will not explain the white paper now. Wait for it.
No we don't have to give up. There won't be any place on earth to emmigrate to. This totalitarianism is global this time. You have 3 axis powers pretending to be antagonists who are really working together to enslave the people, and between them their militaries can reach any corner of the globe. China has a huge standing army to deploy to South America, Africa, etc.. They will hunt you down.