> oskarw85@: That's simply not true. Even if the underlying mechanism is the public-private key pair most owners do not use it with signing in mind.

OP: Society with and without "phones" are foundamentally different. The introduction and adoption of cryptography into daily life is at this level.

In the beginning, we probably could only attract a small group of adoptors. But the monthly active editors of Wikipedia is only O(100000) and the number of editors that actively review and "like" edits are even smaller, around O(1000). This is the scale of users that have made great impact on Wikipedia and the world's knowledge.