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Tangerang City has the highest number of applications in Indonesia, with a total of 222 public service and government management applications supported by an ISO 27001:2013-certified data center. This data center is managed by the ICT Infrastructure and Cryptography Division of the Tangerang City Communication and Informatics Office. However, the process of managing data center assets and infrastructure still relies on OnlyOffice Nextcloud. This approach creates challenges in reading and processing data into meaningful information, data inconsistency, and the inability to track data changes effectively. Moreover, policymakers face difficulties in identifying devices that have reached their end of life (EOL) or are over five years old. This method limits strategic data analysis needed to support decision-making. Therefore, a digital system is required to manage data in a structured and consistent manner, track data changes, and provide relevant information for policymakers. Such a system is expected to enhance operational efficiency and support high-quality digital transformation.

Messages require high security in the exchange process because the message is confidential and may only be read by the intended recipient. Information security problems in messages are often encountered, such as active eavesdropping, passive eavesdropping, fraud and data manipulation by unauthorized parties. To overcome this problem, cryptography can be used. This research uses cryptographic techniques with the Vigenere Cipher method to encrypt messages. The aim of this research is to encrypt messages to produce codes that will be sent to the recipient. The encryption process is carried out using the Vigenere Cipher method in the Python programming language. The researcher implemented a program to encrypt the message. The research results show that messages can be protected more strongly and securely. So, if the message is hijacked or intercepted by irresponsible parties, it will be difficult for them to find out the contents of the message. In this way, the confidentiality and authenticity of the message is maintained until it reaches the recipient.

The development of quantum computing presents new challenges to the security of data stored and processed by today's computer systems. Quantum computers have the ability to perform calculations at very high speeds, which could threaten the security of currently used encryption algorithms. Therefore, steps are needed to design and implement an operating system that is able to protect data from quantum computing threats. Ubuntu Linux version 22.04, as one of the leading open source Linux distributions, offers high-level security features. To face the era of quantum computing, it is necessary to carry out special development and implementation of this operating system. This research aims to improve the security of the Ubuntu Linux operating system version 22.04 so that it can withstand quantum computing attacks by designing and implementing a quantum-resistant cryptography protocol and testing the security and performance of the resulting system. This research method uses a qualitative approach and research and development (R&D) with literature studies. The research results show that the integration between Liboqs and OpenSSL on Linux Ubuntu 22.04 successfully implements a cryptographic algorithm that is resistant to quantum computing. Although there is a slight performance increase due to the additional overhead of the quantum algorithm, the security of the system in protecting data from quantum computing attacks is proven to be well maintained.    

In the current digital era, data security is a top priority for individuals, organizations, and businesses. Data is considered a valuable asset that needs to be protected from various security threats, especially in operating systems where data is stored (data at rest) and transmitted (data in motion) through networks. This research aims to enhance data security by implementing modern cryptographic methods. The cryptographic methods used include RC4, AES, and WPA3. Penetration testing is conducted to evaluate the effectiveness and efficiency of each cryptographic method. The research results show that the implementation of modern cryptography provides an additional layer of security against security threats to data in motion and data at rest within the operating system.

The Industrial Internet of Things (IIoT) has revolutionized industrial processes, offering automation and data-driven decision-making. However, this interconnectedness brings new security challenges, especially in crucial infrastructure sectors. Traditional security measures are inadequate, leading to the exploration of innovative solutions. Blockchain technology has emerged as a promising solution due to its decentralized and immutable nature. This paper proposes a Hybrid Blockchain-Based Authentication Mechanism for IIoT, combining Delegated Proof of Stake (DPoS) and Elliptic Curve Cryptography (ECC). The hybrid architecture utilizes public and private blockchains to ensure scalability, efficiency, and security. Lightweight consensus algorithms, DPoS, are incorporated to optimize performance, while ECC provides efficient cryptographic techniques suitable for IIoT environments. An interoperable framework facilitates seamless integration with existing infrastructure, ensuring regulatory compliance and compatibility. Decentralized identity management further enhances security and privacy. Results and analysis demonstrate the effectiveness of the proposed solution, positioning hybrid blockchain architecture as the most suitable approach for enhancing security in IIoT environments.

This research is normative legal research that uses a normative judicial approach. The research results show that: (1) There are differences of opinion between judges, e-commers and notaries. regarding the strength of proof of a signature on an electronic document in proving civil procedural law in Indonesia. Judges and e-commers are of the opinion that electronic documents that have been signed with an electronic signature have the same evidentiary power as authentic deeds made by authorized officials, after the issuance of Law Number 11 of 2008 concerning Electronic Information and Transactions. Meanwhile, the notary is of the opinion that an electronic document signed with an electronic signature only has the power of proof under the hand, because it does not meet the requirements as an authentic deed, that is, it does not appear before an authorized official; and (2) Settlement of disputes resulting from non-fulfillment of the agreement can be resolved using a court or an institution outside the court, but e-comers generally use institutions outside the court because it is considered easier and faster to resolve and the costs are cheaper.The use of an electronic signature on an electronic document can guarantee the security of an electronic information message, which uses a public network, because electronic signatures are created based on asymmetric cryptography technology. From this research, there are differences of opinion regarding the evidentiary power of electronic documents signed with electronic signatures that are used as evidence in trials. The use of an electronic signature on an electronic document can guarantee the security of an electronic information message, which uses a public network, because electronic signatures are created based on asymmetric cryptography technology. From this research, there are differences of opinion regarding the evidentiary power of electronic documents signed with electronic signatures that are used as evidence in trials. Furthermore, electronic signatures need to be certified so that they have evidentiary power such as authentic deeds and there is no need to carry out digital forensic tests in the evidentiary process at trial.    

Data security is an important aspect of information systems, especially in the widely used windows operating system environment. Modern encryption technology offers a variety of ways to increase data protection from security threats. This method utilizes literature insights and comparative analysis of various cryptographic techniques applied to the Windows operating system. Data sources were obtained from academic journals, books and technical documents from Microsoft and cyber security institutions. This article describes various modern cryptographic techniques that can be applied to the Windows operating system, including symmetric and asymmetric algorithms and end-to-end encryption. Protocol implementation security. This research also examines the effectiveness of cryptographic techniques in overcoming cyber security threats and provides the best recommendations for improving data security. It also provides a comparative analysis of various cryptographic techniques implemented in Windows operating systems. This study shows that evaluating encryption techniques can help overcome cyber threats and provide optimal solutions to improve data security. Data sources were obtained from academic journals, books, and technical documents from Microsoft and cyber security.

In the rapidly advancing digital era, information security has become a crucial aspect in maintaining the confidentiality, integrity, and authenticity of data. This article discusses the relationship between information system auditing and the use of modern cryptographic combinations in securing text messages. Information system auditing serves as an evaluation mechanism to ensure that security policies, procedures, and standards are correctly and consistently applied. On the other hand, modern cryptography provides advanced encryption technology that protects text messages from unauthorized access and manipulation. By combining these two approaches, we can create a robust framework for securing text messages, ensuring that data remains safe and protected during transmission and storage. Research results indicate that integrating information system auditing with modern cryptographic techniques significantly enhances the security and reliability of information systems.      

Cloud-based systems are increasingly vulnerable to a range of cybersecurity threats, driving the need for advanced encryption methods. This paper investigates the potential of quantum cryptography in securing cloud environments, focusing on the use of quantum key distribution (QKD) protocols. By leveraging the principles of quantum mechanics, the study demonstrates significant improvements in data security, offering enhanced protection against eavesdropping and paving the way for more resilient cloud security frameworks.

The rapid advancement of quantum computing has significantly impacted data security, as classical cryptographic algorithms such as RSA and ECC are increasingly vulnerable to quantum attacks. This study aims to evaluate the performance of classical and post-quantum cryptographic algorithms in a quantum simulation environment, focusing on stability, efficiency, and computational time. The research method employed experimental simulations using Qiskit, where cryptographic algorithms were modeled into quantum circuits and tested across varying qubit sizes of 128, 256, 512, and 1024. The simulation results indicate that classical algorithms face substantial limitations, with exponentially increasing computational time and drastically reduced stability beyond 512 qubits. In contrast, post-quantum algorithms demonstrated superior performance, maintaining high stability up to 1024 qubits, achieving greater quantum efficiency, and showing resilience against quantum attacks such as Shor’s and Grover’s algorithms. These findings highlight the urgent need to transition toward post-quantum cryptography as a more adaptive and reliable approach to safeguarding data in the quantum era. Although post-quantum algorithms still face certain challenges, such as larger key sizes and slightly higher computational costs at smaller scales, their overall benefits are far more significant in ensuring sustainable information security. Therefore, adopting post-quantum cryptography represents a strategic step that must be prioritized to address the evolving risks posed by quantum computing technologies.