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Imagine a world where every one of the billions of lightbulbs in use today is a wireless hotspot delivering connectivity at speeds that can only be dreamed of with Wi-Fi. That's the goal of the man who invented such a technology, and this week Li-Fi took a step out of the domain of science fiction and into the realm of the real when it was shown to deliver speeds 100 times faster than current Wi-Fi technology in actual tests. An Estonian startup called Velmenni used a Li-Fi-enabled lightbulb to transmit data at speeds as fast as 1 gigabit per second (Gbps), which is about 100 times faster than current Wi-Fi technology, meaning a high-definition film could be downloaded within seconds. The real-world test is the first to be carried out, but laboratory tests have shown theoretical speeds of 224 Gbps. Who Invented Li-Fi? The term was coined by German physicist Harald Haas during a TED Talk when he outlined the idea of using lightbulbs as wireless routers. That addre

In cryptography, a collision attack on a cryptographic hash tries to find two inputs producing the same hash value, i.e. a hash collision. A Collision Attack is an attempt to find two input strings of a hash function that produces the same hash result. Because hash functions have infinite input length and a predefined output length, there is inevitably going to be the possibility of two different inputs that produce the same output hash. If two separate inputs produce the same hash output, it is called a collision. This collision can then be exploited by any application that compares two hashes together – such as password hashes, file integrity checks, etc. For example, let’s say we have a hypothetical hash function called “Hesh”. A collision attack would first start with a starting input value, and hash it. Hesh(hello) = 89232323 Now the attacker needs to find a collision – a different input that generates the same hash as the previous input. This would genera