Package edu.fiu.adwise.homomorphic_encryption.socialistmillionaire

Class bob_veugen

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_veugen

All Implemented Interfaces:

CipherConstants, bob_interface

Direct Known Subclasses:

bob_elgamal

public class bob_veugen
extends bob

See the papers "Improving the DGK comparison protocol" and Correction to ”Improving the DGK comparison protocol” by Thjis Veugen, You can find these in the papers directory! Represents Bob's implementation of the Veugen 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.

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_veugen(KeyPair a, KeyPair b)	Constructs a `bob_veugen` instance with two key pairs.
bob_veugen(KeyPair a, KeyPair b, KeyPair c)	Constructs a `bob_veugen` instance with three key pairs.

Method Summary

Modifier and Type	Method	Description
boolean	Protocol2()	See the paper Correction to "Improving the DGK comparison protocol", this implements Protocol 3.

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_veugen

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

Constructs a `bob_veugen` 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_veugen

public bob_veugen(KeyPair a,
 KeyPair b)
           throws IllegalArgumentException

Constructs a `bob_veugen` 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 Correction to "Improving the DGK comparison protocol", this implements Protocol 3. This is an improved version of Protocol 1, initially created by DGK, see original bob class This protocol involves multiple steps, including decryption, modular arithmetic, and secure communication with Alice to determine the comparison result.

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.

IllegalArgumentException - if the protocol constraints are violated.