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It is possible for you to do whatever you choose

It is possible for you to do whatever you choose

Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. Never be bullied into silence. Never allow yourself to be made a victim. Accept no one's definition of your life; define yourself.

Don't go around saying the world owes you a living. The world owes you nothing. It was here first. If you don't like something, change it. If you can't change it, change your attitude. Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.

It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change. All changes, even the most longed for, have their melancholy; for what we leave behind us is a part of ourselves; we must die to one life before we can enter another.

Take up one idea. Make that one idea your life - think of it, dream of it, live on that idea. Let the brain, muscles, nerves, every part of your body, be full of that idea, and just leave every other idea alone. This is the way to success.

Last modified on środa, 07 styczeń 2015 12:11
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Jedną z technik rozwiązywania problemów identyfikacji użytkownika są tak zwane pliki „cookie” czyli ciasteczka. Są to pliki przechowujące relatywnie krótkie informacje tekstowe – do 255 znaków (co jest wystarczające do zapamiętania na przykład identyfikatora sesji przeglądania sklepu internetowego itp.).

Pliki „cookie” są zapisywane przez przeglądarkę internetową na komputerze użytkownika stron WWW. Polecenie zapisania odpowiedniego pliku cookie jest przesyłane wraz z odpowiedzią serwera. Może też być wywołane za pomocą, działającego na stronie WWW, skryptu JavaScript. Po zapisaniu „cookie”, przeglądarka za każdym razem, kiedy wysyła nowe żądanie do serwera WWW (np. kiedy po raz kolejny otwiera stronę), pliki cookie są odsyłane do tego serwera. Zawartość plików jest dostępna dla serwera. Dzięki temu aplikacje WWW mogą rozróżniać użytkowników a także przechowywać krótkie informacje po stronie przeglądarki internetowej.

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Do czego używane są pliki „cookie”?

Przeznaczenie cookie nie jest określone. Mechanizm „ciasteczek” ma pewne możliwości, ale cel jego wykorzystania określają programiści.

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Innym powodem używania plików cookie może być chęć tworzenia mechanizmów personalizacji. Niektóre z systemów mogą na przykład próbować wyświetlać treść danej witryny przygotowaną według przewidywanych zainteresowań użytkownika.

Pliki cookie są szeroko stosowane do tworzenia rozmaitych systemów zbierających statystyki. Ruch poszczególnych użytkowników może być śledzony i analizowany. W oparciu o powyższe oprócz personalizacji możliwa staje się próba tak zwanego „targetowania” reklamy, czyli wyświetlania treści reklamowych, które w założeniach mogą zainteresować danego użytkownika.

Niektórzy mogą obawiać się, że dane przechowywane w plikach cookie mogą w jakiś sposób zostać użyte na szkodę użytkownika. Wspomniane obawy są brane pod uwagę przez twórców programów komputerowych takich jak przeglądarki internetowe, ale jednocześnie konieczne jest zapewnienie funkcjonalności potrzebnej do działania aplikacji internetowych. Obiektem ochrony staje się prywatność ruchu generowanego przez poszczególnych użytkowników oraz dane przechowywane w plikach cookie.

Warto zapoznać się z możliwościami przeglądarek intranetowych związanymi z ochroną prywatności oraz ochroną danych danych zapisanych w plikach cookie.

Zabezpieczenia cookie

Pliki cookie zawierają tylko dane tekstowe nie mogą zawierać np. plików wykonywalnych. Dlatego nie mogą przechowywać na przykład wirusów komputerowych, czy programów typu malware.

Ich zawartość może jednak stać się obiektem ataku hakerskiego mającego na celu przejęcie sesji (ang. session hijacking) lub odczytanie danych poufnych. Niestety nie można wykluczyć istnienia dziur w zabezpieczeniach przeglądarek umożliwiających wspomniane działanie.

Podstawowym zabezpieczeniem ciasteczek jest ograniczenie ich przeznaczenia do określonej domeny internetowej, tak że pozostałe serwery internetowe nie mają dostępu do danych zapisanych w ciasteczkach. Innymi zabezpieczeniami są wspomniane atrybuty „Secure” i „HttpOnly”.