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od hugochavez - NSA surveillance: A guide to staying secure
Bruce Schneier-
https://www.theguardian.com/world/2013/sep/05/nsa-how-to-remain-secure-surveillance
"4)...
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NSA surveillance: A guide to staying secure
Bruce Schneier-
https://www.theguardian.com/world/2013/sep/05/nsa-how-to-remain-secure-surveillance"4) Be suspicious of commercial encryption software, especially from large vendors. My guess is that most encryption products from large US companies have NSA-friendly back doors, and many foreign ones probably do as well. It's prudent to assume that foreign products also have foreign-installed backdoors. Closed-source software is easier for the NSA to backdoor than open-source software. Systems relying on master secrets are vulnerable to the NSA, through either legal or more clandestine means.
5) Try to use public-domain encryption that has to be compatible with other implementations. For example, it's harder for the NSA to backdoor TLS than BitLocker, because any vendor's TLS has to be compatible with every other vendor's TLS, while BitLocker only has to be compatible with itself, giving the NSA a lot more freedom to make changes. And because BitLocker is proprietary, it's far less likely those changes will be discovered. Prefer symmetric cryptography over public-key cryptography. Prefer conventional discrete-log-based systems over elliptic-curve systems; the latter have constants that the NSA influences when they can."
