IJSRST162636 | Received: 18 Nov 2016 | Accepted: 25 Nov 2016 | November-December-2016 [(2)6: 223-226] © 2016 IJSRST | Volume 2 | Issue 6 | Print ISSN: 2395-6011 | Online ISSN: 2395-602X Themed Section: Science and Technology 223 A Study of Internet and Cyber Crime Henry Kristian Siburian Lecturer, STMIK Budidarma, Jl. Sisingamangaraja XII No.338, Siti Rejo I, Medan Kota, Kota Medan, Sumatera Utara ABSTRACT Development of network technology, especially Internet technology is now so large that almost any facilities for information requires an internet connection, the more available and easy communication allows the cyber-attacks against the objects connected to the Internet, to minimize cyber-attacks need to be overcome by providing defense in the form of network security, especially in the vital objects such as government agencies, hospitals and banks as well as many other objects also necessary secured, one of the way for protected network were using firewall. Keyword: Cyber Crime, Cyber Defense, Security, Internet Connection, Cyber Attack I. INTRODUCTION Advancement of information and communication technology has changed a lot the way we communicate has changed the face of the world and simultaneously shift the understanding of some power or sovereignty of a country, the strength of a country previously relied on military force but is now beginning to mastery of information technology and communication [1], this is due at the time almost all activities ranging from personal activities until the government cannot be separated from the utilization, empowerment, and implementation of information and communication technologies [1]. The importance of Internet security almost have attention the entire world, especially in the business sector, government, education due to very many transactions processed in seconds, in addition to the sector there are still some people use the internet either adults or children, access to information for children children [2], requires special attention because could have accessed the site is a site that is not in accordance with their age, the ease of the internet has a positive as well as negative effects for some users, and of course we need a form of security in order to minimize the negative effects [2] [3]. To view the security system of the Internet need to know how the system works Internet, among others, is the connection between the computer and the protocol used [4]. Internet is a highway that can be used by everyone (public). To reach the destination server, packets of information to go through multiple systems (routers, gateways, hosts, or other communication devices) that are likely to be out of control. Each point through which has the potential to be cracked, intercepted and forged [3] [4]. Many ways security can be proposed, so an internet connection is used for the better, one of the techniques that can be used is cryptography in exchanging information in the internet [3] and this technique has been used by many companies, especially banks and also national or international level. Modern cryptography involves computers in operation, so has the complexity of the complex. Things that need to be considered in modern cryptography include privacy issues, the data integrity, authentication and non- repudiation [3], in addition to the use of cryptography could also use a special software that can be used as forms of communication security such as Zone Alarm Firewall, BitDefender Firewall and many others. This article we will discuss the use of internet in the country of Indonesia and how the information security that has been applied in Indonesia as well as how the