Answer :
The program generates all possible 4-letter combinations using lowercase letters, converts each combination to an MD5 hash, and checks if it matches any of the encrypted passwords. If a match is found, it prints the corresponding password.
Certainly! Here's an example Java code that generates all possible 4-letter combinations, converts them to MD5 hashes, and checks if they match the given encrypted passwords:
```java
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class PasswordCracker {
private static final String[] encryptedPasswords = {
// Add your encrypted passwords here
"e10adc3949ba59abbe56e057f20f883e", // Example password: "1234"
"5f4dcc3b5aa765d61d8327deb882cf99" // Example password: "password"
};
public static void main(String[] args) throws NoSuchAlgorithmException {
String alphabet = "abcdefghijklmnopqrstuvwxyz";
MessageDigest md5 = MessageDigest.getInstance("MD5");
// Generate all 4-letter combinations
for (int i = 0; i < alphabet.length(); i++) {
for (int j = 0; j < alphabet.length(); j++) {
for (int k = 0; k < alphabet.length(); k++) {
for (int l = 0; l < alphabet.length(); l++) {
String word = String.valueOf(alphabet.charAt(i))
+ alphabet.charAt(j)
+ alphabet.charAt(k)
+ alphabet.charAt(l);
// Convert word to MD5 hash
String hashedWord = getMD5Hash(md5, word);
// Check if the hashed word matches any of the encrypted passwords
for (String encryptedPassword : encryptedPasswords) {
if (hashedWord.equals(encryptedPassword)) {
System.out.println("Password found: " + word);
}
}
}
}
}
}
}
private static String getMD5Hash(MessageDigest md5, String word) {
md5.reset();
md5.update(word.getBytes());
byte[] digest = md5.digest();
StringBuilder sb = new StringBuilder();
for (byte b : digest) {
sb.append(String.format("%02x", b));
}
return sb.toString();
}
}
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