Question

In: Computer Science

write the algorithm for this the code?!. #include<iostream> using namespace std; #include<string.h> int main() { char...

write the algorithm for this the code?!.

#include<iostream>

using namespace std;

#include<string.h>

int main()

{

char plain[50], cipher[50]="", decrypt[50]="";

int subkeys[50], len;

cout<<"Enter the plain text:"<<endl;

cin>>plain;

cout<<"Enter the first subkey:"<<endl;

cin>>subkeys[0];

_strupr(plain);

len = strlen(plain);

/**********Find the subkeys**************/

for(int i=1; i<len; i++)

{

if ((plain[i-1]>='A') && (plain[i-1]<='Z'))

{

subkeys[i] = plain[i-1]-65;

}

/****************ENCRYPTION***************/

for(int i=0; i<len; i++)

{

if ((plain[i]>='A') && (plain[i]<='Z'))

{

cipher[i] = (((plain[i]-65)+subkeys[i])%26)+65;

}

cout<<"The cipher text is:\t"<<cipher<<endl;

/****************DECRYPTION***************/

for(int i=0; i<len; i++)

{

if ((cipher[i]>='A') && (cipher[i]<='Z'))

{

decrypt[i] = ((cipher[i]-65)-subkeys[i])%26;

if (decrypt[i]<0) decrypt[i] += 26; //(if negative number, add 26 to decrypt[i]

decrypt[i] += 65; // from number to ascii

}

cout<<"The decrypted text is:"<<"\t"<<decrypt<<endl;

}

Expert Solution

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venereology answered 1 year ago

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