Passing laws to limit encryption...
Well, for those of you who were around in the 1990s, there was a huge political battle over the rights of ordinary citizens to use cryptography. A well written explation of what transpired in the 1990s was authored by Steven Levy in his book titled Crypto. The short story is the government didn't want citizens to be able to use cryptography, and they lost the political battle to claim that it had the exclusive right to control the use of cryptography.
In the distant past, cryptography was regarded by the state as a military secret. In World War II, the English government employed cryptographers who broke the German "Enigma Machine" codes, and the U.S. government broke the Japanese military codes.
Governments put a high value on being able to access and decode information, especially the military and spying agencies like England's GCHQ and the U.S. NSA. And thanks to Mr. Snowden, we now understand that these agencies are willing to bend and break the law and violate our Constitutional rights in order to do it.
Curiously, the ACM has just announced that this year's A.M. Touring Award will go to Whitfield Diffie and Martin Hellman, who were pivotal in developing the Public Key Exchange used in Public Key Infrastructure encyrption technology.
Looks like defenders of the right to use encryption will have another political fight on their hands if Senators Feinstein and Barr have their way.