Evolving Encryption Techniques

As a consequence, a number of alternative encryption techniques have been proposed
that offer the same distance (security) as RSA but with a shorter key length. Elliptic
curve cryptography (ECC) is one option. Table 9.4 shows the ECC key length against
an equivalently secure RSA key and demonstrates how the advantage of ECC increases
as key length increases.
This delivers significant advantage in terms of processing delay. The examples in
Table 9.5 give typical encryption/decryption delays for a system running at a 20 MHz
clock rate.