Package edu.fiu.adwise.homomorphic_encryption.socialistmillionaire

Class bob_joye

java.lang.Object

edu.fiu.adwise.homomorphic_encryption.socialistmillionaire.socialist_millionaires

edu.fiu.adwise.homomorphic_encryption.socialistmillionaire.bob

edu.fiu.adwise.homomorphic_encryption.socialistmillionaire.bob_joye

All Implemented Interfaces:

CipherConstants, bob_interface

public class bob_joye
extends bob

Represents Bob's implementation of the Joye and Salehi protocol for secure comparison. This class extends the base `bob` class and provides methods for secure computation using homomorphic encryption schemes such as DGK and Paillier. See the paper "Private yet Efficient Decision Tree Evaluation" paper link

Field Summary

Fields inherited from interface edu.fiu.adwise.homomorphic_encryption.misc.CipherConstants

BILLION, CERTAINTY, EIGHT, FIELD_SIZE, FIVE, FOUR, KEY_SIZE, NEG_ONE, THREE, TWO

Constructor Summary

Constructors

Constructor	Description
bob_joye(KeyPair a, KeyPair b)	Constructs a `bob_joye` instance with two key pairs.
bob_joye(KeyPair a, KeyPair b, KeyPair c)	Constructs a `bob_joye` instance with three key pairs.

Method Summary

Modifier and Type	Method	Description
boolean	Protocol2()	See the paper "Private yet Efficient Decision Tree Evaluation" paper link Read Section 3.2 of the paper/Figure 2 for Bob Executes Protocol 2 for secure comparison of encrypted values.

Methods inherited from class edu.fiu.adwise.homomorphic_encryption.socialistmillionaire.bob

compute_delta_b, division, encrypt_bits, encrypted_equals, multiplication, Protocol1, sendPublicKeys, set_socket, sort

Methods inherited from class edu.fiu.adwise.homomorphic_encryption.socialistmillionaire.socialist_millionaires

get_bytes_sent, getDGKPublicKey, getElGamalPublicKey, getPaillierPublicKey, isDGK, readBoolean, readInt, readObject, setDGKMode, setDGKPublicKey, setElGamalPublicKey, setPaillierPublicKey, writeBoolean, writeInt, writeObject

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

bob_joye

public bob_joye(KeyPair a,
 KeyPair b,
 KeyPair c)
         throws IllegalArgumentException

Constructs a `bob_joye` instance with three key pairs.

Parameters:

a - the first key pair (Paillier or DGK).

b - the second key pair (DGK or Paillier).

c - the third key pair (optional, e.g., ElGamal).

Throws:

IllegalArgumentException - if the provided key pairs are invalid or mismatched.

bob_joye

public bob_joye(KeyPair a,
 KeyPair b)
         throws IllegalArgumentException

Constructs a `bob_joye` instance with two key pairs.

Parameters:

a - the first key pair (Paillier or DGK).

b - the second key pair (DGK or Paillier).

Throws:

IllegalArgumentException - if the provided key pairs are invalid or mismatched.

Method Details

Protocol2

public boolean Protocol2()
                  throws IOException,
ClassNotFoundException,
HomomorphicException

See the paper "Private yet Efficient Decision Tree Evaluation" paper link Read Section 3.2 of the paper/Figure 2 for Bob Executes Protocol 2 for secure comparison of encrypted values. This protocol involves multiple steps, including decryption, modular arithmetic, and secure communication with Alice to determine the comparison result. I should note, Protocol1 bob does NOT change from the original DGK or Veugen protocol for Bob, hence no need to reimplement the methods here.

Specified by:

Protocol2 in interface bob_interface

Overrides:

Protocol2 in class bob

Returns:

true if the comparison result indicates x >= y, false otherwise.

Throws:

IOException - if an I/O error occurs during communication.

ClassNotFoundException - if a class cannot be found during deserialization.

HomomorphicException - if an error occurs during homomorphic operations.