import java.util.Scanner;
public class Vigenere {
public static String encrypt(String text, final String key)
{
String res = \"\";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < \'A\' || c > \'Z\')
continue;
res += (char) ((c + key.charAt(j) - 2 * \'A\') % 26 + \'A\');
j = ++j % key.length();
}
return res;
}
public static String decrypt(String text, final String key)
{
String res = \"\";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < \'A\' || c > \'Z\')
continue;
res += (char) ((c - key.charAt(j) + 26) % 26 + \'A\');
j = ++j % key.length();
}
return res;
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println(\"Enter a multi-word message with punctuation:\");
String message = in.nextLine();
System.out.println(\"Enter a single word key with no punctuation:\");
String key = in.nextLine();
String encodedMsg = encrypt(message, key);
System.out.println(\"The encoded message is:\");
System.out.println(encodedMsg);
String decodedMsg = decrypt(encodedMsg, key);
System.out.println(\"The decoded message is:\");
System.out.println(decodedMsg);
}
}
OUTPUT:
Enter a multi-word message with punctuation:
The eagle has landed.
Enter a single word key with no punctuation:
LINKED
The encoded message is:
EPROEJWMUKWOLVQOH
The decoded message is:
THEEAGLEHASLANDED
Solution
import java.util.Scanner;
public class Vigenere {
public static String encrypt(String text, final String key)
{
String res = \"\";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < \'A\' || c > \'Z\')
continue;
res += (char) ((c + key.charAt(j) - 2 * \'A\') % 26 + \'A\');
j = ++j % key.length();
}
return res;
}
public static String decrypt(String text, final String key)
{
String res = \"\";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < \'A\' || c > \'Z\')
continue;
res += (char) ((c - key.charAt(j) + 26) % 26 + \'A\');
j = ++j % key.length();
}
return res;
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println(\"Enter a multi-word message with punctuation:\");
String message = in.nextLine();
System.out.println(\"Enter a single word key with no punctuation:\");
String key = in.nextLine();
String encodedMsg = encrypt(message, key);
System.out.println(\"The encoded message is:\");
System.out.println(encodedMsg);
String decodedMsg = decrypt(encodedMsg, key);
System.out.println(\"The decoded message is:\");
System.out.println(decodedMsg);
}
}
OUTPUT:
Enter a multi-word message with punctuation:
The eagle has landed.
Enter a single word key with no punctuation:
LINKED
The encoded message is:
EPROEJWMUKWOLVQOH
The decoded message is:
THEEAGLEHASLANDED.
import java.util.Scanner; public class Vigenere { public .pdf
1. import java.util.Scanner;
public class Vigenere {
public static String encrypt(String text, final String key)
{
String res = "";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < 'A' || c > 'Z')
continue;
res += (char) ((c + key.charAt(j) - 2 * 'A') % 26 + 'A');
j = ++j % key.length();
}
return res;
}
public static String decrypt(String text, final String key)
{
String res = "";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < 'A' || c > 'Z')
continue;
res += (char) ((c - key.charAt(j) + 26) % 26 + 'A');
j = ++j % key.length();
}
return res;
}
public static void main(String[] args) {
2. Scanner in = new Scanner(System.in);
System.out.println("Enter a multi-word message with punctuation:");
String message = in.nextLine();
System.out.println("Enter a single word key with no punctuation:");
String key = in.nextLine();
String encodedMsg = encrypt(message, key);
System.out.println("The encoded message is:");
System.out.println(encodedMsg);
String decodedMsg = decrypt(encodedMsg, key);
System.out.println("The decoded message is:");
System.out.println(decodedMsg);
}
}
OUTPUT:
Enter a multi-word message with punctuation:
The eagle has landed.
Enter a single word key with no punctuation:
LINKED
The encoded message is:
EPROEJWMUKWOLVQOH
The decoded message is:
THEEAGLEHASLANDED
Solution
import java.util.Scanner;
public class Vigenere {
public static String encrypt(String text, final String key)
{
String res = "";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
3. if (c < 'A' || c > 'Z')
continue;
res += (char) ((c + key.charAt(j) - 2 * 'A') % 26 + 'A');
j = ++j % key.length();
}
return res;
}
public static String decrypt(String text, final String key)
{
String res = "";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < 'A' || c > 'Z')
continue;
res += (char) ((c - key.charAt(j) + 26) % 26 + 'A');
j = ++j % key.length();
}
return res;
}
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
System.out.println("Enter a multi-word message with punctuation:");
String message = in.nextLine();
System.out.println("Enter a single word key with no punctuation:");
String key = in.nextLine();
String encodedMsg = encrypt(message, key);
System.out.println("The encoded message is:");
System.out.println(encodedMsg);
String decodedMsg = decrypt(encodedMsg, key);
System.out.println("The decoded message is:");
System.out.println(decodedMsg);
}
4. }
OUTPUT:
Enter a multi-word message with punctuation:
The eagle has landed.
Enter a single word key with no punctuation:
LINKED
The encoded message is:
EPROEJWMUKWOLVQOH
The decoded message is:
THEEAGLEHASLANDED
![import java.util.Scanner;
public class Vigenere {
public static String encrypt(String text, final String key)
{
String res = "";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < 'A' || c > 'Z')
continue;
res += (char) ((c + key.charAt(j) - 2 * 'A') % 26 + 'A');
j = ++j % key.length();
}
return res;
}
public static String decrypt(String text, final String key)
{
String res = "";
text = text.toUpperCase();
for (int i = 0, j = 0; i < text.length(); i++)
{
char c = text.charAt(i);
if (c < 'A' || c > 'Z')
continue;
res += (char) ((c - key.charAt(j) + 26) % 26 + 'A');
j = ++j % key.length();
}
return res;
}
public static void main(String[] args) {](https://image.slidesharecdn.com/importjava-230408170211-dacc5028/85/import-java-util-Scanner-public-class-Vigenere-public-pdf-1-320.jpg)
