(Un)linkable Pseudonyms
This library contains the functionality of unlinkable pseudonyms based on RSA.
How to use
Base64.Encoder b64Enc = Base64.getEncoder();
String input = "testIdentifier";
// Converter
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
keyPairGen.initialize(1024);
KeyPair prfPair = keyPairGen.generateKeyPair();
PRFSecretExponent xa = new PRFSecretExponent(256, (RSAPrivateCrtKey) prfPair.getPrivate());
byte[] pseuA = Pseudonym.generate(input.getBytes(), xa, (RSAPublicKey) prfPair.getPublic());
PRFSecretExponent xb = new PRFSecretExponent(256, (RSAPrivateCrtKey) prfPair.getPrivate());
byte[] pseuB = Pseudonym.generate(input.getBytes(), xb, (RSAPublicKey) prfPair.getPublic());
// Server A
System.out.println(b64Enc.encodeToString(pseuA));
// Server B
System.out.println(b64Enc.encodeToString(pseuB));
// Converter
byte[] pseuAinB = Pseudonym.convert(pseuA, xa, xb, (RSAPrivateCrtKey) prfPair.getPrivate());
// Server B
System.out.println(b64Enc.encodeToString(pseuAinB));