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. Symmetric versus Asymmetric. Public-key cryptography, in contrast, allows two parties to send and receive encrypted messages without any prior sharing of keys. Secret keys are exchanged over the Internet or a large network. 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. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. Approved for use since the 1970s, symmetric key encryption algorithms are just one way to keep confidential data secure. 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. Asymmetric Key Encryption: Asymmetric Key Encryption is based on public and private key encryption technique. Multiple choice questions on Cryptography and Network Security topic Cryptography Basics. It ensures that malicious persons do not misuse the keys. Symmetric cryptography uses symmetric-key algorithms for the encryption and decryption of data. In symmetric encryption, there is only one key, and all parties involved use the same key to encrypt and decrypt information. Symmetric Encryption. A directory of Objective Type Questions covering all the Computer Science subjects. Asymmetric encryption uses two keys to encrypt a plain text. 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. 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. Encryption types can be easily divided into these two categories: symmetric encryption, or single-key encryption, and asymmetric encryption, or public-key encryption. 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. TLS is an evolution of Secure Sockets Layer, or SSL, and it defines how applications communicate privately over a computer network (the most famous network being – yup, you … 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 … 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. It also requires a safe method to transfer the key from one party to another. 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