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Computer Identification Using Time Information
Jirásek, Jakub ; Grégr, Matěj (referee) ; Polčák, Libor (advisor)
This work deals with the identification of a remote computer by monitoring TCP timestamps of the tracked device. It is possible to determine computer's clock skew from these timestamps as the clock skew is unique for every device. We are able to differentiate devices even though they have changed location, network address or connection type. Passive data capturing ensures that the identification process is invisible to the fingerprinted computer. It is necessary that the network communication of fingerprinted computer is visible to the observing device. We are able to utilise only TCP traffic with timestamps enabled.
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Computer Identification Using JavaScript Timestamps
Jireš, Michal ; Večeřa, Vojtěch (referee) ; Polčák, Libor (advisor)
This thesis deals with remote computer identification based on its internal clock skew. This clock skew will be determined using JavaScript timestamps. The goal of this thesis is to create web page, that will use clock skew to identify computer. This web page will also be used to test time distortion capabilities of browser extension JavaScript Restrictor. Web page will try to identify computer using different security presents thus testing their efficiency.
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Computer Identity Based on Its Internal Clock Skew
Franková, Barbora ; Matoušek, Petr (referee) ; Polčák, Libor (advisor)
Thesis deals with remote computer identification based on its internal clock skew. It describes various methods to collect and evaluate time-related data extracted from TCP, ICMP and Javascript. Software package that implements some of those methods is attached as well. During the work, many experiments were carried out to find out possible effects of certain factors. Tests were aimed on software (operation systems, web browsers and time synchronization) as well as hardware (temperature, power source, distance and network connection type) of the remote systems. Interesting results were discovered in areas of IPv4/IPv6 address pairing and NTP time synchronization.
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Computer Identification Using JavaScript Timestamps
Jireš, Michal ; Večeřa, Vojtěch (referee) ; Polčák, Libor (advisor)
This thesis deals with remote computer identification based on its internal clock skew. This clock skew will be determined using JavaScript timestamps. The goal of this thesis is to create web page, that will use clock skew to identify computer. This web page will also be used to test time distortion capabilities of browser extension JavaScript Restrictor. Web page will try to identify computer using different security presents thus testing their efficiency.
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Computer Identity Based on Its Internal Clock Skew
Franková, Barbora ; Matoušek, Petr (referee) ; Polčák, Libor (advisor)
Thesis deals with remote computer identification based on its internal clock skew. It describes various methods to collect and evaluate time-related data extracted from TCP, ICMP and Javascript. Software package that implements some of those methods is attached as well. During the work, many experiments were carried out to find out possible effects of certain factors. Tests were aimed on software (operation systems, web browsers and time synchronization) as well as hardware (temperature, power source, distance and network connection type) of the remote systems. Interesting results were discovered in areas of IPv4/IPv6 address pairing and NTP time synchronization.
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Computer Identification Using Time Information
Jirásek, Jakub ; Grégr, Matěj (referee) ; Polčák, Libor (advisor)
This work deals with the identification of a remote computer by monitoring TCP timestamps of the tracked device. It is possible to determine computer's clock skew from these timestamps as the clock skew is unique for every device. We are able to differentiate devices even though they have changed location, network address or connection type. Passive data capturing ensures that the identification process is invisible to the fingerprinted computer. It is necessary that the network communication of fingerprinted computer is visible to the observing device. We are able to utilise only TCP traffic with timestamps enabled.
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Somnipathy in children
MAŘÍKOVÁ, Linda
This dissertation deals with night insomnia in children. With the growing number of complaints of parents about insomnia in particular in infants and toddlers, this problem becomes very topical and frequently discussed not only among parents themselves but also among the medical workers involved in the child care. No unambiguous cause of why some children sleep well and other children do not has been yet proven. However, experts dealing with these problems present an opinion in the literature that the main cause lies in the incorrect approach of parents to creating sleep habits in their children. They supplement their opinion by a set of recommendations how to avoid or possibly solve the problems by applying the appropriate approach. Our dissertation thus aims at ascertaining how parents' approach affects creating of incorrect sleep habits in infants and toddlers. The other objective consisted in subsequent drawing up of the nursing diagnosis and nursing care plan by means of which the nurses could independently solve the problems related to insomnia in children. A qualitative research based on the contingent valuation method has been carried out. The methods of data collection included the structured interview performed with two small sets of mothers of children. The first set comprised mothers of children with no sleep problems and the second set was composed of mother of children suffering from sleep problems. The prepared questions related in particular to children's sleep habits. Both sets were compared and the data were also subject to the Fisher's exact test. Although it was not possible to prove that inappropriate approach of parents to creating sleep habits in children is the unambiguous cause of the children's sleep problems, we believe that such inappropriate approach is a related factor. This assumption is supported also by the result of the other part of the research, a non-structured interview. This interview from which casuistry was subsequently created was performed by one of the mothers whose child had suffered from sleep problems. The said mother was willing to try to implement the recommended measures and she subsequently described to us how her son's sleep problems attenuated significantly. On the basis of our hypothesis that creation of correct sleep habits might help children suffering from insomnia, despite the fact that no direct relation between the sleep habits of children and their sleep problems has been proven, as the output of this dissertation we have drawn up the above mentioned nursing diagnosis and nursing care plan which could help the nurses independently solve the children's sleep problems. We also believe that it would be appropriate to carry out research in the future dealing with direct evaluation of success or failure of the recommended measures in solving insomnia in infants and toddlers.
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