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Communicating parties must have the same key in order to achieve secure communication Ciphertext is not to be confused with codetext, because the latter is a result of a code, not a cipher. Types of encryption encryption methods can be categorized based on how keys are used and shared
In symmetric encryption, the same key is used for both encryption and decryption. Decryption, the inverse of encryption, is the process of turning ciphertext into readable plaintext Decryption is the reverse, in other words, moving from the unintelligible ciphertext back to plaintext
A cipher (or cypher) is a pair of algorithms that carry out the encryption and the reversing decryption
The detailed operation of a cipher is controlled both by the algorithm and, in each instance, by a key. Pgp, ssh, and the ssl/tls family. The keys may be identical, or there may be a simple transformation to go between the two keys [1] the keys, in practice, represent a shared.
A key in cryptography is a piece of information, usually a string of numbers or letters that are stored in a file, which, when processed through a cryptographic algorithm, can encode or decode cryptographic data Based on the used method, the key can be different sizes and varieties, but in all cases, the strength of the encryption relies on the security of the key being maintained An alternative, less common term is encipherment To encipher or encode is to convert information into cipher or code.
Although its short key length of 56 bits makes it too insecure for modern applications, it has been highly influential in the advancement of cryptography
Developed in the early 1970s at ibm and based on an earlier design by horst feistel, the algorithm was submitted. A large number of block ciphers use the scheme, including the us data encryption standard, the soviet/russian gost and the more recent blowfish and twofish ciphers In a feistel cipher, encryption and decryption are very similar operations, and both consist of iteratively running a function called a round function a fixed number of times.
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