This book entitled as ""Network Security"" to the students of Sixth Semester Diploma in Computer Science & Engineering. The book is written according to the New Syllabus of State Board of Technical Education (SBTE), Jharkhand. The book covers theory of internet, TCP/IP protocols, network vulnerabilities, threats and attacks, cryptography, Bitcoins and Blockchains, firewalls, VPNs and so on.
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