욕먹을 사이퍼 코드

sscipher

import java.util.Scanner;

public class Cipher {
	private static char key[] = {
			  0x21, 0x40, 0x23, 0x24, 0x25, 0x5e, 0x26, 0x2a, 0x28, 0x29, 0x5f, 0x2d,
			  0x2b, 0x3d, 0x7c, 0x5c, 0x60, 0x7e, 0x7d, 0x7b, 0x5b, 0x5d, 0x27, 0x22,
			  0x3b, 0x3a, 0x3e, 0x3c, 0x3f, 0x2f, 0x71, 0x77, 0x65, 0x72, 0x74, 0x79,
			  0x0a
			};
	
	public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		
		int i;
		
		System.out.println("Input 1 to encrypt or 2 to decrypt");
		
		int mode = scanner.nextInt();
		
		scanner.nextLine();
		
		String plaintext, ciphertext;
		
		switch (mode)
		{
		case 1:
			System.out.println("Input plaintext");
			plaintext = scanner.nextLine();
			ciphertext = "";
		
			for(i=0; i<plaintext.length(); i++)
			{
				ciphertext += key[plaintext.charAt(i) - 'a'];
			}
		
			System.out.println(ciphertext);
			break;
		case 2:
			System.out.println("Input ciphertext");
			ciphertext = scanner.nextLine();
			plaintext = "";
			
			for(i=0; i<ciphertext.length(); i++)
			{
				plaintext += decipher(ciphertext.charAt(i));
			}
			
			System.out.println(plaintext);
		}
		
		scanner.close();
	}
	
	public static char decipher(char cipher)
	{
		int i;
		
		for(i=0; i<key.length; i++)
		{
			if(key[i] == cipher)
			{
				return (char)(i+'a');
			}
		}
		
		return 0x00;
	}
}