SURAJ VIRUS

 The CIA triad in Cryptography When talking about network security, the  CIA  triad is one of the most important model which is designed to guide policies for information security within an organization. CIA stands for : Confidentiality Integrity Availability These are the objectives which should be kept in mind while securing a network. Confidentiality : Confidentiality means that only the authorized individuals/systems can view sensitive or classified information. The data being sent over the network should not be accessed by unauthorized individuals. The attacker may try to capture the data using different tools available on the Internet and gain access to your information. A primary way to avoid this is to use encryption techniques to safeguard your data so that even if the attacker gains access to your data, he/she will not be able to decrypt it. Encryption standards include  AES (Advanced Encryption Standard) and  DES  (Data Encryption Standard). Anot...

 Introduction of Firewall in Computer Network A firewall is a network security device, either hardware or software-based, which monitors all incoming and outgoing traffic and based on a defined set of security rules it accepts, rejects or drops that specific traffic. Accept :  allow the traffic Reject :  block the traffic but reply with an “unreachable error” Drop :  block the traffic with no reply A firewall establishes a barrier between secured internal networks and outside untrusted network, such as the Internet. History and Need for Firewall Before Firewalls, network security was performed by Access Control Lists (ACLs) residing on routers. ACLs are rules that determine whether network access should be granted or denied to specific IP address. But ACLs cannot determine the nature of the packet it is blocking. Also, ACL alone does not have the capacity to keep threats out of the network. Hence, the Firewall was introduced. Connectivity to the Internet is no l...