Introduction To Security

Information security — is the practice of defending
information from unauthorized access, use, disclosure,
disruption, modification, perusal, inspection, recording or
destruction. It is a general term that can be used
regardless of the form the data may take (electronic,
physical, etc.…

Information Assurance — Information operations that
protect and defend information and information systems
by ensuring their availability, integrity, authentication, and
nonrepudiation; including providing for restoration of
information systems by incorporating protection,
detection, and reaction capabilities.

Security Requirements

Encryption

Encryption is the method by which information is converted into secret code that hides the information’s true meaning. The science of encrypting and decrypting information is called cryptography. In computing, unencrypted data is also known as plaintext, and encrypted data is called ciphertext.

Password

A password is a string of characters used for authenticating a user on a computer system. For example, you may have an account on your computer that requires you to log in. In order to successfully access your account, you must provide a valid username and password.

Firewall

A firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or a combination of both. Firewalls prevent unauthorized internet users from accessing private networks connected to the internet, especially intranets.