Network Security: Concepts and Techniques

Network security
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Introduction
Security architecture focus on the requirements and potential risks faced by
business in a specific technological environment.
To meet business requirements, security architecture highlights instances when
security controls are applicable.
To make the network architecture reliable by organizations, it should be
considered to be a design with unique structure that addresses its components.

Security architecture concepts
Cryptography has been designed as a security measure to prevent organizational data
from malicious activities.
Cryptography aims at strengthening data security principles such as; data integrity,
confidentiality, authentication and authorization.
Cryptographic algorithms such as asymmetric and symmetric encryption are very
important.
Symmetric are mainly used in traditional data encryption and it make use of single
key for both encryption and decryption.

Security architecture concepts cont..’
The strength of symmetric algorithm depends on the size of the key which is
naturally exponential.
Asymmetric algorithms makes use of two different set of key for encryption and
decryption.
Both encryption and decryption keys form private and public keys used for
decoding and encoding the data.
In asymmetric, it is not possible to calculate the strength of the corresponding
key.