1.What are the essential ingredients of a symmetric cipher?
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ANSI/ISA-88.00.03–2003 批量控制 第3部分:一般和现场配方模型和表示方法 - 完整英文电子版(80页)
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The essential ingredients of a symmetric cipher are:
1. Key: A secret key that is used to encrypt and decrypt the message.
2. Algorithm: A mathematical formula or process that is used to encrypt and decrypt the message.
3. Plaintext: The original message that is to be encrypted.
4. Ciphertext: The encrypted message that is produced by applying the algorithm to the plaintext using the key.
5. Encryption process: The process of converting the plaintext into ciphertext using the key and algorithm.
6. Decryption process: The process of converting the ciphertext back into plaintext using the key and algorithm.
7. Security: The ability of the cipher to prevent unauthorized access to the plaintext by ensuring that the key is kept secret and that the algorithm is strong enough to resist attacks.
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