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Traditionally, ciphers have used information contained in secret decoding keys to code and decode messages. The process of coding plaintext to create ciphertext is called encryption and the process of decoding ciphertext to produce the plaintext is called decryption. Modern systems of electronic cryptography use. There cloud time video converter key 4 cipher two types of encryption: symmetric key encryption and public asymmetric key encryption. Symmetric key and public key encryption are used, often in conjunction, to provide a variety of security functions for network and information security. Encryption algorithms that use the same key for encrypting and for decrypting information are called symmetric-key algorithms. The symmetric key is also called a secret key because it is kept as a shared secret between the sender and receiver of information. Otherwise, the confidentiality of the encrypted information is compromised. Symmetric key encryption is much faster than public key encryption, often by to 1, times. Because public key encryption places a much heavier computational load on computer processors than symmetric key encryption, symmetric key technology is generally used to provide secrecy for the bulk encryption and decryption of information. Symmetric keys are commonly used by security protocols as. For example, the Transport Layer Security TLS and Internet Protocol security IPSec protocols use symmetric session keys with standard encryption algorithms to encrypt and decrypt confidential communications between parties. Different session keys are used for each confidential communication session and session keys are sometimes renewed at specified intervals. Symmetric keys also are commonly cloud time video converter key 4 cipher by technologies that provide bulk encryption of persistent data, such as e-mail messages and document files. Cryptography-based security technologies use a variety of symmetric key encryption algorithms to provide confidentiality. For more information about the specific encryption algorithms that are used by security technologies, see the applicable documentation for each technology.



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Why some cryptographic keys are much smaller than others