8) Protecting Data Part 1

Match the terms below.

​ (a)   encryption involves one key that is shared between the encoder and decoder. ​ (b)   (public key) encryption uses two keys - a public and a private one. The encoder and the decoder never need to meet to exchange a key. The modern ​ (c)   is built around pubic key encryption.

A random ​ (a)   is very crackable by hand, though it might take some time. However, when aided by computational tools, a random substitution cipher can be ​ (b)   by a novice in a matter of ​ (c)   .

Simple substitution ciphers give insight into ​ (a)   , but as we've seen fall way short when a potential adversary is aided with computational tools... our understanding must become more ​ (b)   .

If we are to create a ​ (c)   , we will need to develop tool and protocols which can resist the enormous computational power of ​ (d)   computers.