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One key is used to encrypt the plaintext and the other key is used to decrypt the ciphertext.
The important point here is that it does not matter which key is applied first, but that both keys are required for the process to work (Figure 1B).
Let me give you two simple examples: While the examples above are trivial, they do represent two of the functional pairs that are used with PKC; namely, the ease of multiplication and exponentiation versus the relative difficulty of factoring and calculating logarithms, respectively.The mathematical "trick" in PKC is to find a trap door in the one-way function so that the inverse calculation becomes easy given knowledge of some item of information.Generic PKC employs two keys that are mathematically related although knowledge of one key does not allow someone to easily determine the other key. As shown in Figure 1A, the sender uses the key to encrypt the plaintext and sends the ciphertext to the receiver.
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.Item Price: .00 At present Amazon gift card is the only method of payment we are accepting.