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Elektroniniu formatu saugomos informacijos apimtys ir svarba vis didėja. Pamažu į elektroninę erdvę perkeliama vis daugiau dokumentų ir viešųjų paslaugų. Anksčiau dokumentų ir duomenų originalumą bei teisingumą patvirtindavo dokumento originalas saugomas archyve, ant kurio visuomet turėjo būti atsakingų asmenų parašai. Siekiant užtikrinti elektroninių dokumentų autentiškumą sukurta elektroninio parašo technologija. Elektroninis parašas – efektyvus būdas užtikrinti dokumento autentiškumą, t.y. patikima ir pasitikėjimą kelianti technologija. Ką daryti tuo atveju, kai reikia didinti pasitikėjimą duomenimis, kurie gaunami iš dokumento ir išsaugomi kaip tam tikros sistemos duomenys? Daliai tokių duomenų būdinga savybė keistis, pvz. moters pavardė po santuokos, kiti duomenys atvirkščiai – turi likti nepasikeitę visą savo gyvavimo periodą, pvz. eksperimentų rezultatai, finansinės apskaitos duomenys. Pirmuoju atveju dažnai tikslinga žinoti kas, kada ir kaip keitė duomenys. Antruoju – tikslinga įsitikinti, kad duomenys tikrai nebuvo pakeisti. Šio darbo metu nagrinėjama būtent pastaroji problema, t.y., kaip padidinti pasitikėjimą duomenimis, kurie turi išlikti autentiški. Darbo metu analizuojama sukurta sistema, kuria siekiama užtikrinti duomenų, o ne dokumentų autentiškumą, panaudojant elektroninį parašą. Taip pat atliekamas eksperimentas palyginantis jau egzistuojančio sprendimo ir pasiūlytos sistemos charakteristikas. / The importance and volume of information stored in electronic form grows in days rather than years. More and more documents and public services are gradually being moved to electronic space. Some time before, document and data originality were endorsed by the original documents which were stored in archives. To ensure electronic documents originality the electronic signature technology was created. Electronic signature is an effective way to ensure the authenticity of the document, i.e. this is a reliable and raising confidence technology. What should we do in case of a need to increase confidence in the data, which are derived from the document and saved as a third party system data? One kind of the data have tendency to change, for example woman's surname after marriage. The other kind has opposite feature – it remains unchanged throughout the period of its existence, for example results of experiments, the accounting data. In the first case is often useful to know who, when and how changed the data. The second case is a bit different – it is crucial to make sure that the data did not change at all. This work is a research on the latter issue, i.e. how to increase confidence in the data, which must remain authentic. A system was developed during the research. It uses electronic signature to prove data authenticity rather than document. We also conducted an experiment comparing the existing and the proposed system performance.

The present research paper deals with the comparison of static and dynamic data structures: static array, dynamic array, pointers array - class TList (Delphi) and dynamic doubly linked list, created with the help of recursive record.To compare the above mentioned structures, sorting (Bubble) and convex hull creation algorithms (Graham, Endrew) are realized, with the time of their implementation analysed. The algorithm of sorting (Bubble) is realized by four ways: static array, dynamic array, pointers array (class TList) and a dynamic doubly linked list, created with the help of recursive record.The algorithms of convex hull creation (Graham, Endrew) is realized by three ways: static array, dynamic array and pointers array (TList).The research paper also describes the pointers array class TList (Delphi), its properties and methods. The sorting method Sort of this class is compared with the sorting method of a “Bubble”. Using class templates, a universal class MList (C++) was created for work with dynamic linear linked lists.