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Yayın Ensuring information security and non-stop functioning of an e-wallet / Bir e-cüzdan’ın bilgi güvenliğinin ve kesintisiz çalişmasının garantilenmesi(Maltepe Üniversitesi, 2019) Mukambetov, ZhankarachThis paper explores the security of electronic payment systems. The study is relevant due to the constant increase in the number of crimes in the field of electronic payments, which is confirmed by official statistics. Users of electronic payment systems need to have an idea about the security of these systems, and therefore, about the security of their funds stored in them. In the course of this work, various electronic payment systems were examined methods ensuring the security of systems were analyzed, and the advantages and disadvantages of their protection methods were identified. Electronic payment system (EPS) is a technology that is a combination of methods, agreements and sub-technologies and allows for payments between counter parties over data transmission networks. EPS is part of e-commerce. Currently the main threat to e-commerce are crimes in the field of information technology, or cybercrime. EPS are divided into mobile services (EPS applications for mobile devices) and non-mobile (browser EPS, desktop EPS applications). By type of payment, EPS is divided into card payment systems and electronic money operators. Payment gateways are a symbiosis of card payment systems and digital cash operators. Such systems allow making almost all possible transactions within one system. Most of the EPS can be considered as gateways, but usually each EPS specifies the main type of electronic payments. During the work the following were accomplished: • Main business processes implemented at the facility were identified; • important assets were identified that relate specifically to these business processes; • vulnerabilities of the described assets were identified. In the course of the work, an analysis was made of the methods protecting mobile and non-mobile EPS services, such as SSL and SET, combined SSL and SET, CVV2- and CVK2-code, Address Verification Service, one-step and two-step authentication, electronic user certificates, E-num, electronic tokens, IP binding, biometric data, etc. Analysis of the protection of mobile services EPS showed that most of the protection methods identified weaknesses and vulnerabilities that make the theft of user’s money possible. However, legislative and technical measures to restrict payments prevent the theft of large sums of money through mobile services.