Answer :
A key is used in encryption to create ciphertext output from a plaintext input. A symmetric decryption technique uses the same key to recover the plaintext output from a ciphertext input.
The use of cryptography in computer security is very beneficial. It does not, however, address every issue with computer security. Its meaning is also distinct from that of the word blockchain. It is crucial to remember that because it is so challenging to guarantee security in cryptography, one shouldn't try to design it unless they have the necessary academic background. We shall approach a handful of cryptography's primitives as a closed system and concentrate on how they are used.
A key is used in encryption to transform plaintext input into ciphertext output. When recovering the plaintext output from a ciphertext input, a symmetric decryption method uses the same key.
The handshake protocols for SSL/TLS, which are how browsers encryption interactions with web servers, and file encryption, which protects disk information, are two examples of real-world uses of cryptography that we might keep in mind.
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