Their paper described a two-key crypto system in which two parties could engage in a secure communication over a non-secure communications channel without having to share a secret key.
PKC depends upon the existence of so-called one-way functions, or mathematical functions that are easy to compute whereas their inverse function is relatively difficult to compute.
Challenge-Handshake Authentication Protocol (CHAP) 5.15. Secure E-mail and S/MIME Secret key cryptography methods employ a single key for both encryption and decryption.
Generic PKC employs two keys that are mathematically related although knowledge of one key does not allow someone to easily determine the other key.
One key is used to encrypt the plaintext and the other key is used to decrypt the ciphertext.
Stream ciphers come in several flavors but two are worth mentioning here (Figure 2).
Stream ciphers operate on a single bit (byte or computer word) at a time and implement some form of feedback mechanism so that the key is constantly changing.
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