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?

Question

BlackTom AI · Accepted Answer

Applying a Caesar shift of +3 (each ciphertext letter shifted forward three positions in the alphabet) immediately decodes the message.

1) Relevant knowledge points and concepts
- A simple substitution cipher can be a Caesar cipher, where every letter is shifted by a fixed amount.
- Short common words (like "the") often reveal the shift when their ciphertext forms a three-letter pattern.

2) Step-by-step reasoning
- Notice the three-letter ciphertext "qeb" — a very common plaintext is "the". To get "the" from "qeb", shift each letter forward by 3: q→t, e→h, b→e. That indicates the cipher uses a +3 shift (ciphertext → plaintext = +3).
- Apply the same +3 shift to every word in the sentence.

3) Calculations and intermediate steps (ciphertext → plaintext, +3 shift)
- Bkzovmqflk: B→E, k→n, z→c, o→r, v→y, m→p, q→t, f→i, l→o, k→n → "Encryption"
- tfii: t→w, f→i, i→l, i→l → "will"
- efab: e→h, f→i, a→d, b→e → "hide"
- qeb: q→t, e→h, b→e → "the"
- lofdfkxi: l→o, o→r, f→i, d→g, f→i, k→n, x→a, i→l → "original"
- qbuq: q→t, b→e, u→x, q→t → "text"

4) Why the correct answer is correct
- Every ciphertext word maps cleanly to an English word under the same +3 shift, producing the grammatical and meaningful sentence "Encryption will hide the original text." This matches option c exactly.

5) Why the other options are incorrect
- a: "Confidential data will remain the same input." — does not match the decoded words.
- b: "Decryption requires knowledge of the key used." — true as a statement but does not match the decoded sentence.
- d: "Digital signatures provide secure authentication." — unrelated vocabulary and structure.

6) Conclusion
- The decrypted message is "Encryption will hide the original text." — option c.

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?单项选择题

类似问题

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A code system for sending messages in which A=1, B=2, and 27 represents a space, is an example of

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