patrickfav

In Jekyll set a variable for the mail, e.g. in the _config.yml

email: [email protected]

then use it in your page

Reach me under:	{{ site.email | mailObfuscate }}

which will generate the following HTML

patrickfav

package at.favre.lib.armadillo;

import org.junit.Test;

import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.Arrays;

patrickfav

#!/bin/sh

# This is part of my blog about AES: https://medium.com/p/7616beaaade9
# Inspired by https://blog.filippo.io/the-ecb-penguin/

# Convert your image to .ppm with Gimp or Photoshop
#
# Usage: ./ecb_img <image file as ppm> <password>

# extract header and body

patrickfav

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class Tester {

    public static String[] pws = {"ZeDRJ:_tu:", "ZeDRJ:_tu1", "ZeDRJ:_tu2", "ZeDRJ:_tu3", "ZeDRJ:_tu4", "ZeD1", "ZeDRJu1", "ZeDRJ:_tu19881", "98asfhj", "adasd", "()=H)d"};
    public static Random r = new Random();
    public static List<BCrypt.Verifyer> verifyers = new ArrayList<>();
    public static boolean introduceMemoryLeak = false;

patrickfav

byte[] key = Bytes.random(16).array();
long id = ...

IdMask<Long> idMask = IdMasks.forLongIds(Config.builder(key).build());

String maskedId = idMask.mask(id);
//example: NPSBolhMyabUBdTyanrbqT8
long originalId = idMask.unmask(maskedId);

patrickfav

## Random Data

Original size: 			1024 byte
Compressed size (raw): 	1047 byte

      Name	       enc	 diff	   %	  enc-comp	 diff
------------------------------------------------------------------
    base85	      1280	  256	  23%	      1076	   29	   2%
    base64	      1366	  342	  31%	      1073	   26	   2%
    base36	      1585	  561	  51%	      1082	   35	   3%

patrickfav

import at.favre.lib.bytes.Bytes;
import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

import java.util.concurrent.TimeUnit;

@SuppressWarnings("CheckStyle")
@State(Scope.Thread)
@Fork(1)
@Warmup(iterations = 2, time = 4)

patrickfav

## Binary

    ┌─────────────────┬──────────────────────────────────────────────────────────────────┐
    │ Efficiency      │ 12.5 % (1 bit/char), 1 bit segments                              │
    │ 32/64/128 bit   │ 1-32/1-64/1-128 chars                                            │
    │ Padding         │ false                                                            │
    │ Const. Out. Len.│ false                                                            │
    │ Suited for      │ number encoding, debugging                                       │
    │ Alphabet        │ 01                                                               │
    │ Known Usages    │ none                                                             │

patrickfav

Proposed Lengths for ID Encryption Schema

32-bit Integer

Integer	Value	MAC	Version	Randomization	Sum	Base64/Base32
deterministic	4 byte	12 byte	1 byte	-	17 byte (136 bit)	22/27
randomized	4 byte	12 byte	1 byte	10 byte	27 byte (216 bit)	36/43

patrickfav

package at.favre.lib.bytes.otherPackage;

import org.junit.Test;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.GCMParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;