KEY DISTRIBUTION HYBRID SCHEME DESIGN FOR ELGAMAL USING KEYSTREAM AS KEY GENERATION MECHANISM

Abstrak

Key distribution security is one of the main issues in modern cryptographic systems, especially in digital data transmission over public networks, asymmetric cryptography such as ElGamal has the advantage of distributing keys securely without the need for secret channels, but is less efficient if used directly for encryption of large data. On the other hand, symmetric cryptography is more efficient but relies heavily on the security of the initial key exchange. Based on research related to hybrid cryptography, combining asymmetric and symmetric algorithms is considered capable of overcoming the weaknesses of each approach. Therefore, this research designs a hybrid key distribution scheme by utilizing ElGamal as a seed delivery mechanism and keystream as a dynamic symmetric key derivation method. According to the references that discuss . The use of keystream, this approach is able to increase the level of key memorability as well as strengthen the resistance to cryptanalysis attacks.

The design and test results show that the proposed scheme is able to generate entropy close to the ideal value as well as maintain data integrity in a lossless manner. This design shows that the integration of ElGamal and keystream is an effective solution to strengthen the security of key distribution and data encryption process.