Question

Let’s assume you do DES double encryption by encrypting a plaintext twice with K1 and K2 respectively. Is this method more secure than the regular single DES encryption? Please explain your reason.

Answer 1

First, we have to know about what is DES? DES is an acronym of DATA ENCRYPTION STANDARDS. It's based on the symmetric encryption technique (means same key for encryption and decryption). It encrypts the data by substituting it into smaller parts of 64-bits and by using a 56-bit key with a cryptographic technique in order to get 64-bit encrypted data. and it provides the 2⁵⁶ encrpytion key logics to encrypt the data.

DES double encryption by encrypting a plaintext twice with K1 and K2 respectively. Is this method more secure than the regular single DES encryption? Please explain your reason.

DES double encryption by encrypting a plaintext twice with K1 and K2 respectively. then it will be more secure than the regular single DES encryption so the answer is no because by using double encrpytion it doesn't mean that it provides you the 56x2=112 bit key to encrypt the data it provides you the same 56 bit key encryption as single DES provides. then there will be a same 2⁵⁶ encrpytion key logics to encrypt the data. but you may think that in Double DES two keys used for encryption then two key also required for decryption of data so as per this scenerio it will be more secure than single DES But double DES is vulnerable Meet in the middle attack (MITM) it is a special type of brute force attack which results into reduce the no of bruteforce operation by a larger no of extent required to decrypt the encrypted data which uses more than one key to encrypt the data like double DES.

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