Limited Algorithm Selection

Oct 13, 2025 by wbrum.org 55 views

File Encryption Optimization with a Hybrid Cryptosystem Scheme for File Security

Introduction

In today's digital era, data security has become a top priority for individuals and organizations alike. With the increasing amount of sensitive information being shared online, the need for robust file encryption methods has never been more pressing. Cryptography, the study of mathematical techniques related to information security, has evolved significantly over the years, with various algorithms and methods being developed to ensure the confidentiality, integrity, and authenticity of data. In this article, we will explore the concept of file encryption optimization using a hybrid cryptosystem scheme, which combines the strengths of symmetrical and asymmetrical cryptographic algorithms to provide enhanced security for sensitive data.

Cryptography: A Brief Overview

Cryptography is a vast field that encompasses various techniques and methods for securing data. At its core, cryptography involves the use of mathematical algorithms to transform plaintext data into unreadable ciphertext, making it difficult for unauthorized parties to access or modify the data. The two primary types of cryptographic algorithms are symmetrical key cryptography and asymmetrical key cryptography.

Symmetrical Key Cryptography

Symmetrical key cryptography involves the use of a single key for both encryption and decryption. This type of algorithm is fast and efficient but has a significant drawback: the key must be kept secret to prevent unauthorized access to the encrypted data. Symmetrical key algorithms, such as the Variably Modified Permutation Composition (VMPC) algorithm, are widely used in various applications, including file encryption.

Asymmetrical Key Cryptography

Asymmetrical key cryptography, on the other hand, uses a pair of keys: a public key for encryption and a private key for decryption. This type of algorithm is more secure than symmetrical key cryptography but is slower and more computationally intensive. Asymmetrical key algorithms, such as the Elgamal algorithm, are commonly used for digital signatures and secure communication.

Hybrid Cryptosystem Scheme

The hybrid cryptosystem scheme combines the strengths of symmetrical and asymmetrical key cryptography to provide enhanced security for sensitive data. By using a symmetrical key algorithm, such as VMPC, for encryption and an asymmetrical key algorithm, such as Elgamal, for decryption, the hybrid cryptosystem scheme offers a robust and efficient solution for file encryption optimization.

VMPC Algorithm

The VMPC algorithm is a symmetrical stream cipher algorithm that produces 8-bit streams of 256 random elements. The initial status of the permutation is calculated in the VMPC key scheduling process, making it a fast and efficient algorithm for encryption. However, the VMPC algorithm has a significant drawback: it is vulnerable to certain types of attacks, such as Brute Force and differential attacks.

Elgamal Algorithm

The Elgamal algorithm is a public key cryptographic algorithm created by Taher Elgamal in 1984. Although initially used for digital signatures, this algorithm was also modified to be used in encryption and decryption. The safety of this algorithm lies in the difficulty of calculating discrete logarithms in prime numbers of large modulos, making it a secure choice for sensitive data.

Genetic Algorithm Optimization

In this study, the key produced randomly was optimized using Genetic Algorithm. Genetic Algorithm produces a unique key every time the algorithm is run, making it an innovative step in the development of current cryptographic technology. By combining the key with ciphertext at the first level to produce ciphertext at the second level, and so on until the third level, the Genetic Algorithm optimization increases the value of the Avalanche effect, making it more difficult for attackers to carry out attacks without knowing the key used.

Test Results

The test results show that the more characters are encrypted and decrypted, the time needed is also longer. In testing the Avalanche effect, the average value for unoptimized keys is 51.25%, while the optimized key is 53.42%. This shows that key optimization using Genetic Algorithm has succeeded in increasing the value of the Avalanche effect and affects the changes in beets in ciphertext.

Additional Analysis and Explanation

The use of hybrid cryptosystem in file encryption optimization provides several advantages, especially in terms of security. By combining symmetrical and asymmetrical cryptographic algorithms, hybrid cryptosystem can provide better protection for sensitive data. In this context, the advantages of VMPC and Elgamal can complement each other, with VMPC providing higher encryption speeds, while Elgamal provides stronger security through the use of public keys.

Optimization using Genetic Algorithm is also an innovative step that is very relevant in the development of current cryptographic technology. By producing a unique key every time the encryption process is carried out, the opportunity for attacks becomes smaller. In addition, the increase in the value of the Avalanche effect achieved shows that small changes in the key will significantly affect the ciphertext results, which is an important aspect in increasing data security.

Conclusion

In conclusion, the hybrid cryptosystem scheme offers a robust and efficient solution for file encryption optimization. By combining the strengths of symmetrical and asymmetrical key cryptography, this scheme provides enhanced security for sensitive data. The use of Genetic Algorithm optimization increases the value of the Avalanche effect, making it more difficult for attackers to carry out attacks without knowing the key used. This study shows a great potential in the application of the Hybrid Cryptosystem scheme to protect sensitive information, and it is an important step in the development of current cryptographic technology.

Recommendations

Based on the results of this study, the following recommendations are made:

Further Research: Further research is needed to explore the potential of the hybrid cryptosystem scheme in various applications, including secure communication and data storage.
Optimization Techniques: Optimization techniques, such as Genetic Algorithm, should be explored to further improve the security of the hybrid cryptosystem scheme.
Implementation: The hybrid cryptosystem scheme should be implemented in various applications to evaluate its effectiveness in real-world scenarios.

Limitations

This study has several limitations, including:

Small-Scale Testing: The study was conducted on a small scale, and further testing is needed to evaluate the effectiveness of the hybrid cryptosystem scheme in larger-scale applications.
Limited Algorithm Selection: The study only explored the use of VMPC and Elgamal algorithms, and further research is needed to evaluate the effectiveness of other algorithms in the hybrid cryptosystem scheme.
Lack of Real-World Scenarios: The study did not evaluate the effectiveness of the hybrid cryptosystem scheme in real-world scenarios, and further research is needed to explore its potential in various applications.
Frequently Asked Questions (FAQs) about File Encryption Optimization with a Hybrid Cryptosystem Scheme

Q: What is file encryption optimization?

A: File encryption optimization is the process of improving the security of file encryption methods by using a hybrid cryptosystem scheme that combines the strengths of symmetrical and asymmetrical key cryptography.

Q: What is a hybrid cryptosystem scheme?

A: A hybrid cryptosystem scheme is a cryptographic method that combines the strengths of symmetrical and asymmetrical key cryptography to provide enhanced security for sensitive data.

Q: What are the advantages of using a hybrid cryptosystem scheme?

A: The advantages of using a hybrid cryptosystem scheme include:

Improved security: By combining the strengths of symmetrical and asymmetrical key cryptography, hybrid cryptosystem schemes provide enhanced security for sensitive data.
Increased efficiency: Hybrid cryptosystem schemes can provide faster encryption and decryption speeds compared to traditional cryptographic methods.
Better protection: Hybrid cryptosystem schemes can provide better protection against various types of attacks, including Brute Force and differential attacks.

Q: What is the VMPC algorithm?

A: The VMPC algorithm is a symmetrical stream cipher algorithm that produces 8-bit streams of 256 random elements. The initial status of the permutation is calculated in the VMPC key scheduling process, making it a fast and efficient algorithm for encryption.

Q: What is the Elgamal algorithm?

A: The Elgamal algorithm is a public key cryptographic algorithm created by Taher Elgamal in 1984. Although initially used for digital signatures, this algorithm was also modified to be used in encryption and decryption. The safety of this algorithm lies in the difficulty of calculating discrete logarithms in prime numbers of large modulos, making it a secure choice for sensitive data.

Q: What is Genetic Algorithm optimization?

A: Genetic Algorithm optimization is a technique used to optimize the key produced randomly using Genetic Algorithm. Genetic Algorithm produces a unique key every time the algorithm is run, making it an innovative step in the development of current cryptographic technology.

Q: What are the benefits of using Genetic Algorithm optimization?

A: The benefits of using Genetic Algorithm optimization include:

Increased security: Genetic Algorithm optimization increases the value of the Avalanche effect, making it more difficult for attackers to carry out attacks without knowing the key used.
Improved efficiency: Genetic Algorithm optimization can provide faster encryption and decryption speeds compared to traditional cryptographic methods.
Better protection: Genetic Algorithm optimization can provide better protection against various types of attacks, including Brute Force and differential attacks.

Q: What are the limitations of the hybrid cryptosystem scheme?

A: The limitations of the hybrid cryptosystem scheme include:

Small-scale testing: The study was conducted on a small scale, and further testing is needed to evaluate the effectiveness of the hybrid cryptosystem scheme in larger-scale applications.
Limited algorithm selection: The study only explored the use of VMPC and Elgamal algorithms, and further research is needed to evaluate the effectiveness of other algorithms in the hybrid cryptosystem scheme.
Lack of real-world scenarios: The study did not evaluate the effectiveness of the hybrid cryptosystem scheme in real-world scenarios, and further research is needed to explore its potential in various applications.

Q: What are the future directions for research on file encryption optimization with a hybrid cryptosystem scheme?

A: The future directions for research on file encryption optimization with a hybrid cryptosystem scheme include:

Further research: Further research is needed to explore the potential of the hybrid cryptosystem scheme in various applications, including secure communication and data storage.
Optimization techniques: Optimization techniques, such as Genetic Algorithm, should be explored to further improve the security of the hybrid cryptosystem scheme.
Implementation: The hybrid cryptosystem scheme should be implemented in various applications to evaluate its effectiveness in real-world scenarios.