Normally used for security purpose. For Applications, softwares, websites.
Cryptography is the one step in ensuring confidentiality of your sensitive information.
Symmetric-key algorithms are a class of algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext and decryption of ciphertext. The keys may be identical or there may be a simple transformation to go between the two keys. The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link.
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