ElGamal

Requirements

Java Zulu 11

Maven 3

Build

mvn clean javafx:jlink

Run

./bin/elgamaljava

Key Generation

First, input key set or generate one for further execution

Figure 1: Options to input arbitary key set or let the program to generate one

Figure 2: Key set output of program key generation

Message Encryption

Second, for message encryption, input message in UTF-8 string. Program will output cipher in base64 format which encodes the cipher pair (C, r). Users ,therefore, can subsequently press on Encrypt button to view (C, r) pair in decimal format.

Figure 3: An arbitary message in UTF-8 string

Figure 4: Cipher pair (C, r) in base64 format

Figure 5: Cipher pair (C, r) in decimal format

Message Decryption

Third, for message decryption, input either cipher (C, r) pair in decimal format or in base64 format. Press Decrypt button to start decrypt the cipher with the private key p and x on the Key Generation section.

Figure 5: Decrypt cipher pair (C, r) in base64 format

Figure 6: Decrypt cipher pair (C, r) in decimal format

Figure 7: Successfully decrypt cipher pair with provided private key p and x