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Encryption has become an integral part of modern life. It is without a doubt of great importance for the realization of some of the basic human rights in the buttons technical environment, for the daily use of numerous on line services, as well as for the functioning of the Internet in general On the other hand, the authorities in charge of detecting and proving crime are increasing facing obstacles when accessing encrypted content. Namely, encryption represents a kind of challenge in the implementation of both general and special evidentiary actions This paper is dedicated to understanding the technical aspects of this challenge. The author explains the basic principles on which encryption techno logy is based. pointing out the difference between symmetric and asymmetric encryption, between encryption of stored data and data encryption in transit, and between server-based and user-based encryption, and its implication for investigation of crime. [ABSTRACT FROM AUTHOR]

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Cryptography is as current as ever. The need to protect data and resources from unauthorised access and use has never ceased. This resulted in creating stronger protection and breaching most of those thought to be unbreachable. This paper analyses core problems and their implementation in breaching the translational cipher by using the programme language C. [ABSTRACT FROM AUTHOR]

Security of wireless computer networks was initially secured with the WEP security protocol, which relies on the RC4 encryption algorithm and the CRC algorithm to check the integrity. The basic problems of the WEP are a short initialization vector, unsafe data integrity checking, using a common key, the lack of mechanisms for management and exchange of keys, the lack of protection from the endless insertion of the same package into the network, the lack of authentication of access points and the like. The consequences of these failures are easy attacks against the WEP network, namely their complete insecurity. Therefore, the work began on the IEEE 802.11i protocol, which should radically improve the security of wireless networks. Since the development of a protocol lasted, the WPA standard was released to offset the security gap caused by the WEP. The WPA also relies on RC4 and CRC algorithms, but brings temporary keys and the MIC algorithm for data integrity. The 802.1X authentication was introduced and common keys are no longer needed, since it is possible to use an authentication server. The length of the initialization vector was increased and the vector is obtained based on the packet serial number, in order to prevent the insertion of the same packet into the network. The weakness of the WPA security mechanism is the use of a common key. WPA2 (802.11i) later appeared. Unlike the WPA mechanism that worked on old devices with the replacement of software, WPA2 requires new network devices that can perform AES encryption. AES replaces the RC4 algorithm and delivers much greater security. Data integrity is protected by encryption. Despite progress, there are still weaknesses in wireless networks. Attacks for denial of service are possible as well as spoofing package headers attacks. For now, it is not advisable to use wireless networks in environments where unreliability and unavailability are not tolerated. [ABSTRACT FROM AUTHOR]

Along with the development of confidentiality of data and resources, there is a need to develop systems that would provide confidentiality. Currently, the most used systems are classical cryptographic systems and encryption public key systems. However, none of these systems provides a solution for the famous "catch 22" of cryptography. Owing to the intensive development of quantum mechanics, in the last 30 years emerged an entirely new kind of cryptography-quantum cryptography. Its greatest contribution is a possibility to discover an intercepted communication channel from a third party. The question is: is this really true? The question arises: 'If the quantum cryptography is so good, why is not widely used?' The aim of this paper is, on the one hand, to define the basic mechanisms of quantum cryptography IP, and, on the other hand, to point to the shortcomings, as they related to the opportunities of today's devices and flaws in protocols. [ABSTRACT FROM AUTHOR]