Han Ming receives the following encrypted message: "Bkzovmqflk tfii efab qeb lofdfkxi qbuq." If the message was encrypted using a simple substitution cipher, what is the decrypted message?

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First, I’ll restate the question and the answer choices to set the scene for the analysis.
Question: Han Ming receives the following encrypted message: "Bkzovmqflk tfii efab qeb lofdfkxi qbuq." If the message was encrypted using a simple substitution cipher, what is the decrypted message?
Answer options:
- a. "Confidential data will remain the same input."
- b. "Digital signatures provide secure authentication."
- c. "Encryption will hide the original text."
- d. "Decryption requires knowledge of the key used."

Now, let’s evaluate each option one by one and explain why it is or isn’t a good description of what a simple substitution cipher does.
Option a: "Confidential data will remain the same input." This statement asserts that encryption does not alter the content of the message. In fact, encryption transforms plaintext into ciphertext so that the original information is not directly readable. Therefore this option contradicts the fundamental purpose of encryption and is incorrect.
Option b: "Digital signatures provide secure authentication." This option is about digital signatures, which are a separate cryptographic concept used to verify the origin and integrity of a message, not about the basic function of encryption or the process of decryption with substitution ciphers. It does not describe what a simple substitution cipher does to the text, so it is incorrect.
Option c: "Encryption will hide the original text." This statement captures the essential purpose of encryption: to convert readable plaintext into an obscured form that hides its content from unauthorized readers. In the context of a simple substitution cipher, encryption indeed hides the original text, which makes this option a correct general description of the cipher’s effect.
Option d: "Decryption requires knowledge of the key used." While this is true for many cipher systems, it is not a direct statement about what the encrypted message represents or what the decrypted message will be. It speaks to the process (requiring the key) rather than describing the outcome or property of the encrypted text itself. Depending on the phrasing, it can be considered true, but it doesn’t answer what the decrypted message is and is less central to the effect of encryption. In the strict sense of describing the decrypted content, this is not the best match and is thus less appropriate here.

In summary, option a wrongly claims no change to content, option b shifts focus to digital signatures not pure encryption, option c correctly states the core effect of encryption to conceal the original text, and option d describes a condition for decryption rather than the nature of the decrypted message itself. The reasoning aligns with choosing the option that best characterizes what encryption does to the plaintext.

Introduction to Security and Forensic Technologies (CT046-3-1-ISFT-25-RESIT)

Han Ming receives the following encrypted message: "Bkzovmqflk tfii efab qeb lofdfkxi qbuq." If the message was encrypted using a simple substitution cipher, what is the decrypted message?

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