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In cryptography the message is encrypted by the sender and decrypted by the reciver. so, it ensures message security.
public key cryptography private key cryptography
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There are two types of cryptography algorithms:
1) Public key cryptography
2) Secret key cryptography
There are 2 types of cryptography such as:
1- Symmetric-key or Secret key Cryptography 2- Asymmetric-key or Public key Cryptography