EDIT:
http://interviews.slashdot.org/story/01/09/24/162236/philip-...
I posted that link on another comment. But it addresses this one to some extent, he also mentions that the terrorist use of encryption was a significant issue in the 1990s. Still can't find the source for my original comment.
[0] http://kotaku.com/reporting-error-leads-to-speculation-that-...
The NYT seemed to be the source for that claim, and they quietly pulled that story. It's still repeated by media outlets elsewhere.
Not that it would change my opinion that government mandated crypto backdoors are a bad idea if they had.
That was the speculation I heard the other evening on NPR, by someone lobbying to put limits on private citizens' use of strong crypto.
Yes, french HUMINT has heavily infiltrated extremist organizations, and failed to prevent this attack. It does not mean that it was the use of encryption that allowed ISIS/extremist organizations to execute this attack on french soil.
The french secret service approach is fundamentally different from the US, as they historically rely less on SIGINT.
I am not sure where I read it, but in presume the number of prevented attack is in the thousands.
Then why don't we have thousands of prosecuted and convicted terrorists in our jails?
But I get your point. I need to check that article back then.
But they still happily installed only-now-legal "black boxes" at major providers to siphon data, don't you worry.