Everything you wanted to know about Public Key Infrastructure, but were too insecure to ask.
Encryption makes data unintelligible.
Decryption restores the data to its pre-encrypted form, making it intelligible again. Cryptography Cryptography is the science and practice of encrypting and decrypting. In secret key encryption, the same key is used to encrypt and decrypt. Inherent in secret key encryption is the problem of secure key distribution . For example, if you want to send me an encrypted message, you have to securely send me the secret key first.