Created
September 14, 2016 21:50
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One Time Pad
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| import java.io.File; | |
| import java.io.FileNotFoundException; | |
| import java.util.Base64; | |
| import java.util.Random; | |
| import java.util.Scanner; | |
| public class OTP { | |
| public static void main(String[] args) throws FileNotFoundException { | |
| File flag = new File("flag.txt"); | |
| Scanner sc = new Scanner(flag); | |
| String plaintext = sc.nextLine(); | |
| sc.close(); | |
| OTP(plaintext); | |
| } | |
| /* | |
| one time pads are secure!! | |
| no way you'll be able to crack this | |
| */ | |
| static void OTP(String plaintext) { | |
| Random r = new Random(); | |
| //test to make sure our OTP is random! | |
| //I heard that to make sure your OTP is secure your RNG must be random | |
| int[] rand = new int[256]; | |
| for (int i = 0; i < 256; i++) { | |
| int x = r.nextInt(); | |
| System.out.println(x); // DEBUG | |
| rand[i] = x; | |
| } | |
| System.out.println("-------"); | |
| if (stdev(rand) > 1e9) { | |
| String encrypted = ""; | |
| for (int i = 0; i < plaintext.length(); i++) { | |
| encrypted += (char) (Math.abs((plaintext.charAt(i) ^ r.nextInt()) % 128)); | |
| } | |
| System.out.println(Base64.getEncoder().encodeToString(encrypted.getBytes())); | |
| } | |
| } | |
| static double stdev(int[] list) { | |
| double mean = 0.0; | |
| for (int x : list) { | |
| mean += x; | |
| } | |
| mean = mean / list.length; | |
| double sum = 0.0; | |
| for (int x : list) { | |
| sum += Math.pow(x - mean, 2); | |
| } | |
| return Math.sqrt(sum / list.length); | |
| } | |
| } |
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| ------- | |
| HhckDAQwUXo/fl9FJRV4bloPZSdgGX0JGGwCHkNSTGM= |
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