What is Network Security ?
Well!!! Hello everyone! It’s ravitbughunter Back again I hope you all doing very well. todays we will learn Computer network security.
During initial days of internet, it is use of limited to military and universities for research and development purpose. Different approaches to computer network security management have different requirements depending on the size of the computer network. For example, a home office requires basic network security while large businesses require high maintenance to prevent the network from malicious attacks.
A network is considered secure only when it comprises three key components confidentiality, integrity, and availability. This combination, called the CIA triad, is a well known standard used while creating network security policies for any organization.
Network Administrator controls access to the data and software on the network. A network administrator assigns the user ID and password to the authorized person.
A network outage that results in a temporary unavailability or temporary curtailment of supply to a customer by the relevant network and excludes network interruptions that are less than one (1) minutes duration; Sample 1, Sample 2, Sample 3.
A network security breach refers to when an outsider finds a way to bypass your cyber security to get inside your network. Once inside your system, they can gain unauthorized access to data, applications, and devices. Think of a cyber security breach like a burglar eluding security systems to break into a bank.
A functionality and operability of interconnected electronic communications networks and the protection of these networks against faults caused by electromagnetic disturbance and/or operating load, Sample 1 and Sample 2 .
A Network authentication is the process of vetting users that request secure access to networks, systems, or devices. This process determines user identity and can be found from username and password credentials and other technologies like authentication apps or biometrics .
There are several authentication types. For purposes of user identity, users are typically identified with a user ID, and authentication occurs when the user provides credentials such as a password that matches their user ID .
Cryptography is technique to encrypt the plain text data which makes it is difficult to understand and interpret . there a several cryptographic algorithm available present day as described below :
- Secret Key Encryption
- Public Key Encryption
- Massage Digest
Secret Key Encryption :
In secret key encryption, since the same key is used to encrypt and decrypt, proper safeguarding and distribution of that key is of paramount importance. If the key is shared with unauthorized or unintended recipients at any time during the information’s life cycle, the protection of the information must be considered compromised. A compromised data protection, or encryption process that is considered to be compromised, cannot be relied on to support the confidentiality and integrity (the C and I elements of the CIA triangle) of the data being encrypted .
Public Key Encryption :
Public-key cryptography, or asymmetric cryptography, is an encryption scheme that uses two mathematically related, but not identical, keys – a public key and a private key. Unlike symmetric key algorithms that rely on one key to both encrypt and decrypt, each key performs a unique function. The public key is used to encrypt and the private key is used to decrypt.
It is computationally infeasible to compute the private key based on the public key. Because of this, public keys can be freely shared, allowing users an easy and convenient method for encrypting content and verifying digital signatures, and private keys can be kept secret, ensuring only the owners of the private keys can decrypt content and create digital signatures.
Massage Digest :
A message digest is a numeric representation of a message computed by a cryptographic hash algorithm or a function. Regardless of the size of the message, the message digest produces a numeric representation of a fixed size when hashed. It is used to ensure and verify that a message is genuine.
This means that if Bob sends a message or file to you online, you can verify that it has not been tampered with or modified. So when Bob sends the message, he also sends along the message digest he computed. When you receive the message, you then hash it and compare the two message digests.
For example, the message “I love MUO” produces a specific hash. If the message is modified just a little by adding an exclamation mark, making it “I love MUO!”, the message digest will also be changed. This way, you can verify whether your message has been altered before getting to you .
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