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What are cryptocurrencies?

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Cryptocurrencies are the digital media of exchange which use cryptography and shared transaction ledgers to create a secure, anonymous, traceable and potentially stable monetary system. Cryptocurrencies take their name from their use of cryptography. Cryptography is the study of the methods of encrypting information, primarily with the intention of sending a message securely and privately but also for tasks such as data security and authentication. Crypto, the prefix in both words, comes from the Greek word kruptos, which means “secret.” Cryptocurrencies incorporate many of the technologies and theories developed by cryptographers in order to create a digital money exchange system that is resistant to both censorship and fraud. In the two decades prior to 2008, there had been several attempts at creating a decentralized currency that would rely on cryptographic protocols and distributed networks. It is only with the launching of Bitcoin, however, that the idea has really taken root an…

ISSUE: How To Hack PayU – And Buy 10x More For The Same Price

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Do you know PayU? It is a Paypal competitor on emerging markets. A few weeks ago I was talking with my friend, who was working on online payment integration with PayU REST API. He showed me that you can play around with payment details and PayU API won’t complain about amount not mathematically correct. It is possible, that client will increase products quantity without increasing the amount to pay. I invested some time to test all the cases and this article will show you how to hack PayU payments and to get more than you paid for. Disclaimer: I wrote this article to draw attention to a problem. Remember that I don’t approve using it for personal advantages and exploiting this bug can result in legal action. PayU – What Is It? To cut long story short, PayU is online payment provider. A few years back everyone buying online was providing his credit card details directly to store. It resulted with credit card credentials (sufficient to make payment) being all over the place in trusted (…