Персона: Запечников, Сергей Владимирович
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Институт интеллектуальных кибернетических систем
Цель ИИКС и стратегия развития - это подготовка кадров, способных противостоять современным угрозам и вызовам, обладающих знаниями и компетенциями в области кибернетики, информационной и финансовой безопасности для решения задач разработки базового программного обеспечения, повышения защищенности критически важных информационных систем и противодействия отмыванию денег, полученных преступным путем, и финансированию терроризма.
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- ПубликацияТолько метаданныеOrder-preserving Encryption as a Tool for Privacy-Preserving Machine Learning(2020) Lisin, N.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2020 IEEE.An order-preserving encryption is an encryption scheme based on strictly increasing functions. It allows mapping a set of plaintext into a set of ciphertexts with the order relation specified on a set of plaintexts. Thus, data comparisons and search for the minimum or maximum elements become possible without decrypting data. This type of encryption is mainly used to protect cloud databases in the case when it is necessary to make queries to them. However, it is almost not used in privacy-preserving data mining and machine learning. Nevertheless, it is possible to use this type of encryption in privacy-preserving machine learning, but only for certain algorithms. In this paper, we consider some existing order-preserving encryption schemes and suggest some cases of machine learning, where they can be applied to obtain correctly working privacy-preserving machine learning algorithms. An explanation is also given how and why it is possible to apply order-preserving encryption to these algorithms.
- ПубликацияТолько метаданныеPost-Quantum Security of Messaging Protocols: Analysis of Double Ratcheting Algorithm(2020) Bobrysheva, J.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2020 IEEE.Development in the area of quantum technologies led to the appearance of first quantum computers. The threat of using a quantum computer for cryptanalysis requires wide implementing post-quantum security in computing algorithms and communication protocols. We evaluate the computational power of some existing quantum computers to illustrate the relevance of research in post-quantum security. One of the best ways to test post-quantum protocols is to embed them into some non-critical but widely-used sphere. Secure messaging is an excellent example of such an application. In the paper, we analyze the post-quantum security of well-known messaging specification Signal, which is considered to have high-security properties. The core of Signal specification is the Double Ratchet protocol. We notice and explain why it is not a post-quantum secure scheme. After that, we suggest some possible ways to improve the security features of Signal specification.
- ПубликацияТолько метаданныеMethods and Algorithms for Detecting Compromise of Secret Keys(2020) Kuzmicheva, S.; Kiryakina, M.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2020, Springer Nature Switzerland AG.It is not uncommon for a single user to use multiple devices to access applications, such as messengers. The legitimacy of using client devices and access rights should be monitored to ensure the necessary level of information security. In the paper authors analyze and discuss some approaches to detect unauthorized usage of cryptographic keys. The first approach is known as trace-independent inconsistency, the second approach is an observation of contradiction, the third approach called an observation of acausality. All three approaches are based on the additional dedicated audit service to the application under protection. The main result of our investigation is the technique for applying these principles to the secure communication and messaging protocols. In the paper authors suggest a cryptographically protocol for detecting compromise of secret keys based on blockchain technology.
- ПубликацияТолько метаданныеMethods and Approaches for Privacy-Preserving Machine Learning(2020) Lisin, N.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2020, Springer Nature Switzerland AG.One of the main problems of machine learning is the need for a large amount of memory and a long learning time. To solve this problem, many companies prefer to store their data and training models on remote servers. However, not all data and models can be stored in the plaintext without any protection. In many areas (for example, banking or medical), the privacy of data and models is very important. To ensure confidentiality, a privacy-preserving machine learning application is a good solution. This article discusses two main approaches to privacy-preserving machine learning (cryptographic and perturbation), describes methods for ensuring privacy, which they include, and provides examples of using of some methods in practice.
- ПубликацияТолько метаданныеA Technique of Protocol Construction for Detecting Compromises of Secret Keys(2020) Kiryakina, M.; Kuzmicheva, S.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2020 IEEE.Currently a single user often utilizes multiple devices to get access to applications, for example, messengers. A way to provide the necessary level of information security is monitoring the legitimacy of using client devices according to a set of access rights. In this paper, we suggest a cryptographic protocol for detecting compromises of secret keys based on blockchain technology. In contrast with currently available solutions, the blockchain-based protocol allows controlling usage of all long-term cryptographic keys, as well as every key in a chain of short-term keys. Besides that, an additional audit service can be used for monitoring secure messaging protocols. Moreover, the protocol includes an authentication service for users. All these techniques make the idea of blockchain-based protocol promising.
- ПубликацияТолько метаданныеThe Relevance of Using Post-quantum Cryptography on the Isogenies of Elliptic Curves for Mobile Application Protection(2020) Bobrysheva, J.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2020, Springer Nature Switzerland AG.The article is a brief overview of the relevance of using cryptographic protocols on isogenies of elliptic curves in mobile applications. The article briefly describes the current situation in the field of cryptography that has arisen in connection with the development of a new generation of computer technology, namely, quantum computers. The article describes the stages of standardization of post-quantum cryptography in accordance with the NIST competition. The article contains a comparison of post-quantum algorithms in terms of cryptographic stability and speed, defines of advantages and disadvantages of protocols on isogenies of elliptic curves, and results of studies on the implementation of the protocols on isogenies of elliptic curves on mobile platforms. The main goal of the article is to consider the possibility of using protocols on the isogeny of elliptic curves for practical purposes to protect confidential information in mobile systems and applications.
- ПубликацияТолько метаданныеProtocols for Secure Management of Multidimensional Data Arrays(2019) Gorlatykh, A.; Zapechnikov, S.; Запечников, Сергей ВладимировичPopular technologies such as data mining and online analytical processing are widely known as technologies heavy-based on the usage of multidimensional data structures. However, at the same time, development of the security countermeasures leaves much to be desired. Currently, there is no complex multidimensional data processing system capable to ensure proper security levels exist. In the paper, we propose security protocols which formed the basis of our solution aimed to provide security for multidimensional data storage and processing. We describe basic protocols for data read and write operations adopted for the features of multidimensional data structures and security assumptions.
- ПубликацияТолько метаданныеTechniques for Private Transactions in Corporate Blockchain Networks(2021) Konkin, A.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2021 IEEE.Blockchain platforms are generally applied to automate operations using a trusted environment with broadcast messaging and distributed data storing. At the same time corporates still have business requirements to also send confidential peer-to-peer messages or private transactions. Mainly these requirements derive from the law obligations (bank secrecy, GDPR, etc.) and the necessity to protect competitive market advantages. Blockchain platforms for public networks ignore requirements for private transactions due to user anonymity and the absence of personal data in blockchain networks. Enterprise blockchain platforms for corporate networks mostly address confidential issues by transferring private data through trusted third parties (TTP) or intermediaries, and off-chain peer-to-peer messaging. However, these approaches miss core blockchain advantages of a trusted environment-immutability and integrity of private data. This article introduces a new technique and its implementation of private transactions in a blockchain that is based on both off-chain peer-to-peer messaging with confidential data and broadcast transactions that contain hashes of private data to verify immutability and integrity. The article provides technical details of the method, also performance issues are discussed.
- ПубликацияТолько метаданныеPost-quantum Group Key Agreement Scheme(2021) Bobrysheva, J.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.Progress in quantum technologies forces the development of new cryptographic primitives that are resistant to attacks of an adversary with a quantum computer. A large number of key establishment schemes have been proposed for two participants, but the area of group post-quantum key establishment schemes has not been studied a lot. Not so long ago, an isogeny-based key agreement scheme was proposed for three participants, based on a gradual increase in the degree of the key. We propose another principle for establishing a key for a group of participants using a tree-structure. The proposed key establishment scheme for four participants uses isogeny of elliptic curves as a mathematical tool.
- ПубликацияТолько метаданныеPost-quantum Secure Group Messaging(2021) Bobrysheva, J.; Zapechnikov, S.; Запечников, Сергей Владимирович© 2021 IEEE.Due to development in quantum computing, we need to create and implement new cryptographic protocols, which are resistant to attacks using a quantum computer, in all practical cases. Last years humans became using messengers to transfer far more important information than earlier, so it is necessary to create new post-quantum secure messaging protocols for peer-to-peer and group communications. In this article, we describe needed security properties, existing ways for the creation of group chats, and our suggestions. We described ways and needed primitives for the creation of a group key establishment scheme based on isogenies of elliptic curves. We describe such protocol as an extended Double Ratchet protocol.