# symmetric key cryptography in computer networks

Encryption types can be easily divided into these two categories: symmetric encryption, or single-key encryption, and asymmetric encryption, or public-key encryption. Approved for use since the 1970s, symmetric key encryption algorithms are just one way to keep confidential data secure. Asymmetric Key Encryption: Asymmetric Key Encryption is based on public and private key encryption technique. Cryptography: Cryptography is derived from the Greek word, which means “Hidden Secrets.”In other words, it is an art in which we can protect our data and information. CSE497b Introduction to Computer and Network Security - Spring 2007 - Professor Jaeger Page Shared key cryptography • Traditional use of cryptography • Symmetric keys, where A single key (k) is used is used for E and D D( k, E( k, p ) ) = p • All (intended) receivers have access to key • Note: Management of keys determines who has Computer-based Symmetric Key Cryptographic Algorithms: Algorithm Types and Modes, An overview of Symmetric Key Cryptography, DES, International Data Encryption ... Cryptography and Network Security – by Atul Kahate – TMH. In Symmetric-key encryption the message is encrypted by using a key and the same key is used to decrypt the message which makes it easy to use but less secure. Symmetric cryptography uses symmetric-key algorithms for the encryption and decryption of data. Through cryptography, we convert our data into Unreadable Secret Codes, called Cipher Text and can read this data only, which will have the secret key to decrypt it. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. In symmetric encryption, there is only one key, and all parties involved use the same key to encrypt and decrypt information. 2. Symmetric Key vs. Public Key Encryption The same key should be installed on both PCs that receive and transmit the encrypted data in order to realize symmetric key encryption. It ensures that malicious persons do not misuse the keys. Secret keys are exchanged over the Internet or a large network. Multiple choice questions on Cryptography and Network Security topic Cryptography Basics. Data Communications and Networking- by Behourz A Forouzan Public-key cryptography, in contrast, allows two parties to send and receive encrypted messages without any prior sharing of keys. Symmetric versus Asymmetric. Asymmetric encryption uses two keys to encrypt a plain text. An algorithm is a specific formula with a limited number of steps that contains instructions for solving a problem, and a symmetric-key algorithm is a specific formula that often uses the same cryptographic key for both encryption and decryption.To better understand how this … A directory of Objective Type Questions covering all the Computer Science subjects. Asymmetric encryption is also known as public key cryptography, which is a relatively new method, compared to symmetric encryption. In symmetric-key cryptography, the sender and the recipient must know (and keep secret from everyone else) a shared encryption key that is used to encrypt and decrypt the messages to be sent. It also requires a safe method to transfer the key from one party to another. Public-key encryption and symmetric-key encryption are two of the most fundamental cryptographic systems out there and they’re also the driving force behind the Transport Layer Security (TLS) protocol. 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