How to resolve the algorithm Substitution cipher step by step in the jq programming language

Published on 12 May 2024 09:40 PM
#Jq

How to resolve the algorithm Substitution cipher step by step in the jq programming language

Table of Contents

Problem Statement

Substitution Cipher Implementation - File Encryption/Decryption

Encrypt an input/source file by replacing every upper/lower case alphabets of the source file with another predetermined upper/lower case alphabets or symbols and save it into another output/encrypted file and then again convert that output/encrypted file into original/decrypted file. This type of Encryption/Decryption scheme is often called a Substitution Cipher.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Substitution cipher step by step in the jq programming language

Source code in the jq programming language

def key: 
  "]kYV}(!7P$n5_0i R:?jOWtF/=-pe'AD&@r6%ZXs\"v*N[#wSl9zq2^+g;LoB`aGh{3.HIu4fbK)mU8|dMET><,Qc\\C1yxJ";

def encode:
  (key|explode) as $key
  | explode as $exploded
  | reduce range(0;length) as $i ([];
        . + [$key[ $exploded[$i] - 32]] ) 
  | implode;
 
def decode:
  (key|explode) as $key
  | explode as $exploded
  | reduce range(0;length) as $i ([];
       $exploded[$i] as $c
       | . + [ $key | index($c) + 32] )
  | implode ;

def task:
  "The quick brown fox jumps over the lazy dog, who barks VERY loudly!"
   | encode as $encoded
   |"Encoded:  \($encoded)",
    "Decoded:  \($encoded|decode)" ;

task

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