The substitution cipher is the oldest forms of encryption algorithms according to creates each character of a plaintext message and require a substitution process to restore it with a new character in the ciphertext.This substitution method is deterministic and reversible, enabling the intended message recipients to reverse-substitute ciphertext characters to ... Read More

A poly-alphabetic cipher is any cipher based on substitution, using several substitution alphabets. In polyalphabetic substitution ciphers, the plaintext letters are enciphered differently based upon their installation in the text. Rather than being a one-to-one correspondence, there is a one-to-many relationship between each letter and its substitutes.For example, ‘a’ can ... Read More

IDEA stands for the International Data Encryption Algorithm. IDEA is a symmetric-key block cipher. It is denoted the same key can be used to encrypt the plaintext and decrypt the ciphertext.IDEA needed both the encrypting and decrypting parties to have a secret key that is different from a public-key and ... Read More

IDEA is a block cipher and it operates on 64bit plaintext and 128 bit key. IDEA is reversible like DES that is, the equivalent algorithm can be used for encryption and decryption. IDEA needs both diffusion and confusion for encryption.The 64-bit plaintext is divided into four portions of 16bit plaintext ... Read More

IDEA stands for International Data Encryption Algorithm. IDEA is a block cipher invented by James Massey and Xuejia Lai and was first defined in 1991. It uses 128 bit key length which works on 64 bit blocks.It includes a series of eight identical transformations depend upon bitwise exclusiveor, addition and ... Read More

Blowfish is a symmetric block cipher algorithm invented by Brute Schneier in December 1993. The Blowfish algorithm has several advantages. It is applicable and efficient for hardware implementation and no license is needed. The elementary operators of Blowfish algorithm contains table lookup, addition and XOR. The table contains four S-boxes ... Read More

Blowfish is a symmetric block cipher algorithm invented by Brute Schneier in December 1993. Blowfish is a substitute of DES or IDEA. One of the most popular feistel network ciphers is Blowfish. Blowfish algorithm has 64-bit block size and variable key length from 42 bits to 448 bits. The algorithm ... Read More

Blowfish is the symmetric block cipher algorithm and it encrypts the block information of 64-bits at a time. It follows the Feistel network and the working procedure of this algorithm is divided into two parts.Subkey Generation − This process transform the key upto 448 bits long to subkeys adding 4168 ... Read More

The Blowfish encryption algorithm is a symmetric block cipher designed to achieve in the DES algorithm that was slow and uncertain. Blowfish is a keyed, symmetric cryptographic block cipher invented by Bruce Schneier in 1993 and located in the public domain.Symmetric encryption uses an individual encryption key to both encrypt ... Read More

The strength of DES is as follows −Use of 56 bit keys56 bit key can be frequently used in encryption. There are 256 possible keys. A brute force attack on such number of keys is impossible.A machine implementing one DES encryption per microsecond would take more than thousands of years ... Read More