http://www.slate.com/articles/technology/future_tense/2015/07/encryption_back_doors_aren_t_necessary_we_re_already_in_a_golden_age_of.html

In recent months, law enforcement, led by FBI Director James Comey, has waged war against the “going dark” problem—criminals using secure communications technologies, particularly encryption, to evade justice. Its solution to this problem is to encourage or require technology companies to build in back doors to allow the government to circumvent, say, encryption on your iPhone. But in reality, we are currently in a golden age of surveillance. The “going dark” argument should not be used as a reason to support back doors or other special access by law enforcement to encrypted communications.