Encryption & Digital Signatures

In order to encrypt a message the sender will need both an encryption ............ and a secret key.

Once plain text has been encrypted it is known as ........... text.

When text is scrambled by replacing one character with another this is known as:

• asynchronous encryption

• substitution cipher

• polygram cipher

How many possible keys exist with an 8-bit key?

• 8

• 64

• 128

• 256

To use cryptographic methods as a way of confirming identity we can use a digital ................