With advancement in technology day by day, technology made our life very easier and smart. However, there are some issue and challenges are come with these new technologies. In this paper, we are going to discuss current challenges and latest emerging trends about Cyber-security under Network Security. Today, all the information of any office, bank, state, country and many more are stored on cloud infrastructure. But the internet hackers break the security of these cloud server which is the very danger crime. So, Network-security helps us to protect our data from Cyber-attacks. It is also known as Information Technology Security. This study first discusses importance of cyber security today like about different types of Cyber-crime and its effect. Second, we will discuss block chain, and hash function of Network security. Further, we will discuss some new idea for improvement in Network Security.
Key words: Cyber Security, Block chain, Hash, Cyber-attack, IT, Security.
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