NTqwYeb7

1import java.util.Scanner;
2
3public class CaesarCipher {
4
5	static Scanner scan = new Scanner(System.in);
6	
7	public static void main (String args[]) {
8	
9		
10		System.out.print("Please enter the message you would like to encrypt: ");
11		String originalMessage = scan.nextLine();
12	
13		System.out.print("Please enter your secret key: ");
14		int secretKey = scan.nextInt();
15		
16		encryptMessage(originalMessage, secretKey);
17		
18		scan.nextLine();
19		
20		System.out.print("\nPlease enter the message you would like to decrypt: ");
21		String userEncryptedMessage = scan.nextLine();
22		
23		System.out.print("Please enter your secret key: ");
24		secretKey = scan.nextInt();
25		
26		decryptMessage(userEncryptedMessage, secretKey);
27		
28		scan.nextLine();
29		
30		System.out.print("\nPlease enter the message you would like to identify: ");
31		String encryptedMessage = scan.nextLine();
32		
33		System.out.print("\nPlease enter the letter you would like to identify: ");
34		char letter = scan.next().charAt(0);
35		
36		System.out.print("Please enter your identifier number (the number of times the given letter appeared in the unencrypted message): ");
37		int numberOfTimes = scan.nextInt();
38		
39		identifyKeys(encryptedMessage, letter, numberOfTimes);
40		
41	}
42	
43	public static String encryptMessage (String originalMessage, int secretKey) {
44		String encryptedMessage = "";
45
46		for (int i = 0; i < originalMessage.length(); i++) {
47			if (originalMessage.charAt(i) > 64 && originalMessage.charAt(i) < 91) {
48				char ch = (char)((int)(originalMessage.charAt(i) + (secretKey - 65)) % 26 + 65);
49				encryptedMessage += ch;	
50			}
51			else {
52			encryptedMessage += originalMessage.charAt(i);
53			}
54		}
55		//Prints user encrypted message
56		System.out.println(encryptedMessage);
57		
58		return encryptedMessage;
59	}
60
61	public static String decryptMessage (String userEncryptedMessage, int secretKey) {
62		String decryptedMessage = "";
63		
64		for (int i = 0; i < userEncryptedMessage.length(); i++) {
65			if (userEncryptedMessage.charAt(i) > 64 && userEncryptedMessage.charAt(i) < 91) {
66				char ch = (char)((int)(userEncryptedMessage.charAt(i) + (secretKey - 65)) % 26 + 65);
67				decryptedMessage += ch;	
68			}
69			else {
70			decryptedMessage += userEncryptedMessage.charAt(i);
71			}
72		}
73		//Prints user encrypted message
74		System.out.println(decryptedMessage);
75		return decryptedMessage;
76	}
77
78	public static void identifyKeys (String encryptedMessage, char letter, int numberOfTimes) {
79		int frequency = 0;
80		String decryptedMessage = "";
81		
82		System.out.println(encryptedMessage);
83		
84		//for (int i = 1; i < 26; i++) {
85			for (int j = 0; j < encryptedMessage.length(); j++) {
86				if (encryptedMessage.charAt(j) > 64 && encryptedMessage.charAt(j) < 91) {
87					char ch = (char)((int)(encryptedMessage.charAt(j) + (0 - 65)) % 26 + 65);
88					decryptedMessage += ch;	
89				}
90				else {
91				decryptedMessage += encryptedMessage.charAt(j);
92				}
93				
94			}
95			decryptedMessage = "";
96			System.out.println(decryptedMessage);
97			
98	//	}
99	}
100}