Answer Posted / guest
The science and art of manipulating messages in order to
make them secure is called cryptography......
types are
symmetric key cryptography and asymmetric key cryptography
1)symmetric key cryptography
same key is used for encryption and decryption
eg :DES IDEA AES
2)Asymmetric key:
public key is used for both encryption and decryption
eg:RSA Difere Hellman
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