CCNA-Security-210-260-Cryptography Concepts

Cryptography concepts 1.3.a Describe key exchange 1.3.b Describe hash algorithm 1.3.c Compare and contrast symmetric and asymmetric encryption Cryptography Concepts: Network traffic is protected when traversing the public Internet through cryptographic methods. Cryptography is derived from the Greek word “Kryptos,” which means hidden or secret. Cryptography is the study and practice of hiding information. Cryptography is the art and science of making data impossible to read. Cryptographic algorithms start with plaintext and scramble it so it becomes an unreadable ciphertext. Symmetric and Asymmetric Encryption: There are two types of encryption keys symmetrical and asymmetric. Symmetric encryption uses a single key that needs to be shared among the people who need to receive the message while asymmetrical encryption uses a pair of public key and a private key to encrypt and decrypt messages when communicating. Symmetric encryption is an old technique while asymmetric encryption is relatively new. Asymmetric encryption takes relatively more time than the symmetric encryption.