Network Security Concepts Essay - 1761 Words

Network Security Concepts File security falls into two categories, encryption and access. Access to files can mean physical access to a computer with unsecured files or access via user permissions or privileges in the form of access control lists (ACLs) (Strengthen Your Users File Security, 2003). The files kept on a server with NTFS storage can be locked to prevent anyone who does not have the correct permissions from opening them. This is secure but can be bypassed with physical access to an open computer and should not be used for sensitive information. The other method of securing files is by encrypting the information in the files using an Encrypting File System (EFS), which employs public key encryption privileges (Strengthen†¦show more content†¦Secret and private keys are very similar and are often used interchangeably. The difference is that secret keys are used for both encryption and decryption, while a private key is part of the public/private key system and is used only for decryption (C ryptography, 2005). In both cases, the key may be known only to a single person or a limited group of people in order to keep the key secure. Public-Key Infrastructure (PKI) is a method of verifying users on a network, while a digital certificate is a reference from a neutral company that confirms the identity of an internet site (Shay, 2004, p. 321) and (Tomsho, G., Tittel, E. Johnson, D., 2004, P. 378). The digital certificate is issued by a Certificate Authority (CA) such as Verisign, and a registration authority (RA) that acts as a reference to identify an entity to a user of the website, and uses a directory that holds the certificate and can revoke a companys digital status. The PKI technology is at the core of the digital certificates used in almost all transactions on the internet. The PKI uses a cryptographic key pair, one of which is public and one which is private, to authenticate the owner of the certificate (PKI, 2002). In each of the layers of the OSI model, there are security risks that exist and are developing now, andShow MoreRelatedInternal Network Security1451 Words   |  6 Pagespeople in various places. Companies can get many advantages by using Internet network to support their business. Therefore, companies are trying as hard as they can, and give high effort in protecting their network from attack and make sure that they have the best network security. Most people think that the threat of security attack is only come from outside the company. In fact, the attack from inside the company network is more harmful with high frequency to be happened. 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