Cryptographer and security expert Bruce Schneier has warned that David Cameron's proposed ban on strong encryption threatens to "destroy the internet".
Last week the prime minster told parliament that he wanted to ensure terrorists did not have a "safe place in which to communicate".
Strong encryption is used in some of the world's most popular tech products including the iPhone, Whatsapp and Facebook, and the term refers to the act of jumbling data in such a way that it cannot be understood by anyone without the correct key or password.
David Cameron first indicated that he would attempt to clamp down on secure communications that could not be decrypted by law enforcement back in January after the Charlie Hedbo shootings in Paris.
His comments immediately generated a flurry of condemnation from security and privacy activists.
Schneier serves on the board of digital liberties pressure group the Electronic Frontier Foundation, and writes frequently on encryption and security.
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