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close #4204
This commit is contained in:
acbin
2023-06-09 18:52:05 +08:00
committed by GitHub
parent ad03086f54
commit 00282efd8b
521 changed files with 5233 additions and 7309 deletions
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21
src/main/java/com/thealgorithms/ciphers/HillCipher.java
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@@ -4,10 +4,11 @@ import java.util.Scanner;
/*
* Java Implementation of Hill Cipher
* Hill cipher is a polyalphabetic substitution cipher. Each letter is represented by a number belonging to the set Z26 where A=0 , B=1, ..... Z=25.
* To encrypt a message, each block of n letters (since matrix size is n x n) is multiplied by an invertible n × n matrix, against modulus 26.
* To decrypt the message, each block is multiplied by the inverse of the matrix used for encryption.
* The cipher key and plaintext/ciphertext are user inputs.
* Hill cipher is a polyalphabetic substitution cipher. Each letter is represented by a number
* belonging to the set Z26 where A=0 , B=1, ..... Z=25. To encrypt a message, each block of n
* letters (since matrix size is n x n) is multiplied by an invertible n × n matrix, against
* modulus 26. To decrypt the message, each block is multiplied by the inverse of the matrix used
* for encryption. The cipher key and plaintext/ciphertext are user inputs.
* @author Ojasva Jain
*/
public class HillCipher {
@@ -28,7 +29,7 @@ public class HillCipher {
keyMatrix[i][j] = userInput.nextInt();
}
}
//check if det = 0
// check if det = 0
validateDeterminant(keyMatrix, matrixSize);
int[][] messageVector = new int[matrixSize][1];
@@ -62,7 +63,7 @@ public class HillCipher {
System.out.println("Ciphertext: " + CipherText);
}
//Following function decrypts a message
// Following function decrypts a message
static void decrypt(String message) {
message = message.toUpperCase();
// Get key matrix
@@ -75,10 +76,10 @@ public class HillCipher {
keyMatrix[i][j] = userInput.nextInt();
}
}
//check if det = 0
// check if det = 0
validateDeterminant(keyMatrix, n);
//solving for the required plaintext message
// solving for the required plaintext message
int[][] messageVector = new int[n][1];
String PlainText = "";
int[][] plainMatrix = new int[n][1];
@@ -157,9 +158,7 @@ public class HillCipher {
static void validateDeterminant(int[][] keyMatrix, int n) {
if (determinant(keyMatrix, n) % 26 == 0) {
System.out.println(
"Invalid key, as determinant = 0. Program Terminated"
);
System.out.println("Invalid key, as determinant = 0. Program Terminated");
}
}