With the further development of high-speed digital electronic communications (the Internet and its predecessors), a need became evident for ways in which users could securely communicate with each other, and as a further consequence of that, for ways in which users could be sure with whom they were actually interacting.
高速デジタル通信（インターネットやその前身）の更なる発展により、利用者がお互いに安全に通信できる方法や、更に利用者が実際に対話していた人を確認できる方法の必要性が明白になった。