Key Domain Of Multiplicative Cipher

Because additive multiplicative and affine ciphers have small key domains they are very vulnerable to brute force attack.

Key domain of multiplicative cipher. Solution we use a multiplicative cipher to encrypt the message hello with a key of 7. For example c becomes 2 and multiplied by 2 gives 4 which gives e. To encrypt a plain letter p to the cipher letter c using the multiplication cipher we use the encryption function.

P c a p mod 26. 1 3 5 7 9 11 15 17 19 21 23 25. The multiplicative cipher is a special case of affine cipher in whichk.

The ciphertext is xczzu. Thus it is also not very secure. Multiplication cipher this page defines a multiplication cipher theory.

Where k 1 multiplicative inverse of k key the key space of multiplicative cipher is 12. Ask question asked 2 years 5 months ago. Active 2 years 5 months ago.

As the value may be greater than 25 we take a modulu 26 operation to make sure we end up with a letter such as. This set has only 12 members. How do you find the key domain of the multiplication cipher efficiently.

Example 3 7 the key needs to be in z 26. Because additive multiplicative and affine ciphers have small key domains they areveryvulnerabletobrute forceattack. The affine cipher is a combination of additive cipher and multiplicative cipher.