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Introduction In the 21st century, online security has become paramount! Most of us share on the internet a lot of information about themselves, like identity card number, date of birth, gender, phone number, home address and so on. Moreover, society like Google, Facebook and Amazon collect information on everything that concerns us, from purchasing behaviour to the time we spend on Instagram rather than on Facebook or LinkedIn: the so-called big data. It’s very important to keep in mind that sec...