Binary Terms

The security design principles are considered while designing any security mechanism for a system. These principles are review to develop a secure system which prevents the security flaws and also prevents unwanted access to the system. Below is the list of fundamental security design principles provided by the National Centres of Academic Excellence in Information … [Read more...] about Fundamental Security Design Principles

A Network Security Model exhibits how the security service has been designed over the network to prevent the opponent from causing a threat to the confidentiality or authenticity of the information that is being transmitted through the network. In this section, we will be discussing the general ‘network security model’ where we will study how messages are shared between the … [Read more...] about Network Security Model

Advanced Encryption Standard (AES) was introduced by NIST in 2001 is a symmetric block cipher which overcomes the key size weakness of DES. AES comes with the variable key sizes i.e. 128-bit key, 192-bit key and a 256-bit key. AES does not follow the Feistel structure in fact it operates on entire plaintext block at once instead of dividing them into two halves. AES can be … [Read more...] about Advanced Encryption Standard (AES)

Feistel block cipher is a structure used to derive many symmetric block ciphers such as DES which we have discussed in our previous content. Feistel cipher proposed a structure which implements substitution and permutation alternately to obtain cipher text from the pain text and vice-versa. In the Feistel block cipher, each block has to undergo many rounds where each round … [Read more...] about Feistel Block Cipher

Block cipher is an encryption and decryption method which operates on the blocks of plain text, instead of operating on each bit of plain text separately. Each block is of equal size and has fixed no of bits. The generated ciphertext has blocks equal to the number of blocks in plaintext and also has the same number of bits in each block as of plain text. Block cipher uses the … [Read more...] about Block Cipher