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What is Encryption? - Purpose of encryption & Types of encryption

What is Encryption? - Purpose of encryption & Types of encryption What is Encryption? - Purpose of encryption & Types of encryption

What is Encryption? - Purpose of encryption & Types of encryption

What is Encryption

What is Encryption? 

In cryptography, encryption is the process of encoding messages or information in such a way that only authorized parties can read it. Encryption does not of itself prevent interception but denies the message content to the interceptor. 

In an encryption scheme, the intended communication information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating ciphertext that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. 

It is in principle possible to decrypt the message without possessing the key, but, for a well-designed encryption scheme, large computational resources and skill are required. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients, but not to unauthorized interceptors.

Purpose of encryption

The purpose of encryption is to ensure that only somebody who is authorized to access data (e.g. a text message or a file), will be able to read it, using the decryption key. Somebody who is not authorized can be excluded, because he or she does not have the required key, without which it is impossible to read the encrypted information.

Types of encryption:-

  1. Symmetric key encryption:- In symmetric-key schemes, the encryption and decryption keys are the same. Communicating parties must have the same key before they can achieve secure communication.
  2. Public key encryption:- In public-key encryption schemes, the encryption key is published for anyone to use and encrypt messages. However, only the receiving party has access to the decryption key that enables messages to be read. Public-key encryption was first described in a secret document in 1973; before then all encryption schemes were symmetric-key (also called private-key). A publicly available public key encryption application called Pretty Good Privacy (PGP) was written in 1991 by Phil Zimmermann, and distributed free of charge with source code; it was purchased by Symantec in 2010 and is regularly updated.



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NEtechy: What is Encryption? - Purpose of encryption & Types of encryption
What is Encryption? - Purpose of encryption & Types of encryption
What is Encryption? - Purpose of encryption & Types of encryption What is Encryption? - Purpose of encryption & Types of encryption
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