package monoalphabeticcipher;
import java.util.Scanner;
public class MonoalphabeticCipher
{
public static char p[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z' };
public static char ch[] = { 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O',
'P', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'Z', 'X', 'C',
'V', 'B', 'N', 'M' };
public static String doEncryption(String s)
{
char c[] = new char[(s.length())];
for (int i = 0; i < s.length(); i++)
{
for (int j = 0; j < 26; j++)
{
if (p[j] == s.charAt(i))
{
c[i] = ch[j];
break;
}
}
}
return (new String(c));
}
public static String doDecryption(String s)
{
char p1[] = new char[(s.length())];
for (int i = 0; i < s.length(); i++)
{
for (int j = 0; j < 26; j++)
{
if (ch[j] == s.charAt(i))
{
p1[i] = p[j];
break;
}
}
}
return (new String(p1));
}
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("Enter the message: ");
String en = doEncryption(sc.next().toLowerCase());
System.out.println("Encrypted message: " + en);
System.out.println("Decrypted message: " + doDecryption(en));
sc.close();
}
}
output:
import java.util.Scanner;
public class MonoalphabeticCipher
{
public static char p[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z' };
public static char ch[] = { 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O',
'P', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'Z', 'X', 'C',
'V', 'B', 'N', 'M' };
public static String doEncryption(String s)
{
char c[] = new char[(s.length())];
for (int i = 0; i < s.length(); i++)
{
for (int j = 0; j < 26; j++)
{
if (p[j] == s.charAt(i))
{
c[i] = ch[j];
break;
}
}
}
return (new String(c));
}
public static String doDecryption(String s)
{
char p1[] = new char[(s.length())];
for (int i = 0; i < s.length(); i++)
{
for (int j = 0; j < 26; j++)
{
if (ch[j] == s.charAt(i))
{
p1[i] = p[j];
break;
}
}
}
return (new String(p1));
}
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
System.out.println("Enter the message: ");
String en = doEncryption(sc.next().toLowerCase());
System.out.println("Encrypted message: " + en);
System.out.println("Decrypted message: " + doDecryption(en));
sc.close();
}
}
output:
run:
Enter the message:
ashish
Encrypted message: QLIOLI
Decrypted message: ashish
BUILD SUCCESSFUL (total time: 7 seconds)
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