# What is Symmetric Encryption? - Definition from Techopedia

## What is Symmetric-Key Cryptography? Webopedia Definition

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#### Description of Symmetric and Asymmetric Encryption

Symmetric encryption systems share the same encryption keys between both ends of network communication. Until the invention of asymmetric key cryptography. Encryption is a key concept in cryptography. This lesson will cover symmetric encryption, a well-known standard for data encryption. A secret key, which can be a number, a word, or just a string of random letters, is applied to the text of a message to change the content in a particular way. Stream ciphers encrypt the digits (typically bytes), or letters (in substitution ciphers) of a message one at a time. Etech has implemented AES symmetric-key algorithm and is the same key used for both encrypting and decrypting the data. Symmetric algorithms use the same key for encryption and decryption (or the decryption key is easily derived from the encryption key), while asymmetric algorithms use a different key for encryption and decryption, and the decryption key cannot be derived from the encryption key. Public key cryptography is used to create public/private key pairs, and public key infrastructure is used to perform key exchange and agreement. Cryptography converts data into a format that is unreadable for an unauthorized user, allowing it to be transmitted without unauthorized entities decoding it back into a …. Introduction This article explains how symmetric and asymmetric encryption work. Definition: Cryptography is associated with the process of converting ordinary plain text into unintelligible text and vice-versa. It is the process in which one can encode a message to a format that can’t be read by an eavesdropper. Symmetric cryptosystems are also sometimes referred to as secret key cryptosystems. Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Cryptography involves creating written or generated codes that allow information to be kept secret. A type of encryption where the same key is used to encrypt and decrypt the message. Next lecture: Stream and Block Encryption Lecture 44: 7 Symmetric vs.

Only the use of a secret key can convert the cipher. In an asymmetric system, each user has a public/private key pair. Contrast this with public-key cryptology, which utilizes two keys - a public key to encrypt messages and a private key to decrypt them. Cryptography is an encryption system in which the sender and receiver of a message share a single, common key that is used to encrypt and decrypt the message. Secure data transmission coding schemes (such as the Data Encryption Standard) which use only one digital key in both encoding and decoding a message. The keys are simply large numbers that have been paired together but are. To create the plaintext from ciphertext, Bob uses the decryption algorithm and the same key. A. Public key cryptography is the use of an asymmetric algorithm, while public key infrastructure is the use of a symmetric algorithm B. The study of symmetric cryptosystems is referred to as symmetric cryptography. Asymmetric encryption was introduced to complement the inherent problem of the need to share the key in symmetrical encryption model, eliminating the need to share the key by using a …. Because of its speed, symmetric encryption is typically used when a message sender needs to encrypt large amounts of data. A symmetric key cipher (also called a secret-key cipher, or a one-key cipher, or a private-key cipher, or a shared-key cipher) Shared_secretis one that uses the same (necessarily secret) key to encrypt messages as it does to decrypt messages. Symmetric encryption is the process of using the same key (two keys which are identical) for both encrypting and decrypting data. Example: To create the ciphertext from the plaintext John uses an encryption algorithm and a key. Cryptography is a method of protecting information and communications through the use of codes so that only those for whom the information is intended can read and process it. Symmetric-key Cryptography Symmetric-key cryptography refers to encryption methods in which both the sender and receiver share the same key (or, less commonly, in which their keys are different, but related in an easily computable way). English Language Learners Definition of cryptography: the process of writing or reading secret messages or codes See the full definition for cryptography in the English Language Learners Dictionary. Keys in the two approaches have very diﬀerent characteristics and are not directly comparable.

An encryption system in which the sender and receiver of a message share a single, common key that is used to encrypt and decrypt the message. Symmetric encryption is a form of computerized cryptography using a singular encryption key to guise an electronic message. Its data conversion uses a mathematical algorithm along with a secret key, which results in the inability to make sense out of a message. This differs from asymmetric (or public-key) encryption, which uses one key to encrypt a message and another to decrypt the message. It is a method of storing and transmitting data in a particular form so that only those for whom it is intended can read and process it. Symmetric definition, characterized by or exhibiting symmetry; well-proportioned, as a body or whole; regular in form or arrangement of corresponding parts. See more. Asymmetric cryptography, also known as public key cryptography, uses public and private keys to encrypt and decrypt data. The Axiomtek's NA362 features the Intel[R] QuickAssist Technology (Intel[R] QAT) for accelerated data processing including symmetric encryption and authentication, asymmetric encryption, digital signatures, RSA, DH, ECC and lossless data compression," said Jack Chen, a product manager of the Network Appliances Division at Axiomtek. Symmetric-key encryption can use either stream ciphers or block ciphers. It is a shared-key methodology, meaning the key used to encrypt the data is the same key used to decrypt it. Symmetric encryption is an old technique while asymmetric encryption is relatively new. It also describes how to build a secure mail system using these two types of encryption. 2. Symmetric Encryption Let's assume that Alice wants to talk to Bob. In contrast to symmetric cryptosystems, public key cryptography is a form of cryptography which generally allows users to communicate securely without having prior access to a shared secret key. Using symmetric encryption, security requires that each pair of users share a secret key. Title: Foundations of Computer Security - …. The Algorithm use is also known as a secret key algorithm or sometimes called a symmetric. Some use the terms cryptography and cryptology interchangeably in English, while others (including US military practice generally) use cryptography to refer specifically to the use and practice of cryptographic techniques and cryptology to refer to the combined study of cryptography …. Iterative methods for symmetric outer product tensor decomposition. Cryptography definition, the science or study of the techniques of secret writing, especially code and cipher systems, methods, and the like. See more. Symmetric encryption is a technique which allows the use of only one key for performing both the encryption and the decryption of …. Symmetric-Key Cryptography: Symmetric-key cryptography uses a single key for both encryption and decryption. Encryption and decryption algorithm are inverse of each other. Definition of cryptography: Discipline or techniques employed in protecting integrity or secrecy of electronic messages by converting them into unreadable (cipher text) form. Be sure that you understand how to differentiate the symmetric cryptography from the asymmetric cryptography when we talk about private keys. For example, the term private key always refers to the private key in the asymmetric key pair, from the asymmetric cryptography system. Asymmetric encryption systems use different encryption keys -- such as public and private -- on each communication endpoint. An encryption algorithm that requires the same secret key to be used for both encryption and decryption. A few well-known examples of symmetric key encryption methods are − Digital Encryption Standard (DES), Triple-DES (3DES), IDEA, and BLOWFISH. This will mean two or more parties will have access to the same key, which for some is a big drawback, even though the mathematical algorithm to protect the data is pretty much impossible to crack.

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