Encryption is the process of encoding messages (or information) in such a way that eavesdroppers or hackers cannot read it, but that authorized parties can.
Using cryptography three purposes are fulfilled:
1- confidentiality
2- integrity
3- non‐repudiation.
Encryption has long been used by militaries and governments to facilitate secret communication. It is now commonly used in protecting information within many kinds of civilian systems. Also, many compliance laws require encryption to be used in businesses to ensure that confidential client data be secured if the device or data is stolen. In this section I will be talking about using encryption for confidentiality and integrity. Non‐repudiation is used, but is not normally implemented for our purposes.
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