A company wants employees to securely send confidential reports to management over the internet. The company decides to use asymmetric encryption.

Which TWO statements about asymmetric encryption are correct?

Question

A company wants employees to securely send confidential reports to management over the internet. The company decides to use asymmetric encryption.

Which TWO statements about asymmetric encryption are correct?

BlackTom AI · Accepted Answer

Asymmetric encryption uses a pair of keys: a public key and a private key.

1. Relevant knowledge points and concepts
- Asymmetric (public-key) cryptography: each user has a key pair—one public, one private. Algorithms include RSA and ECC.
- Confidentiality: anyone can encrypt data with the recipient’s public key; only the recipient’s private key can decrypt.
- Key secrecy and distribution: the public key is intended to be widely distributed; the private key must be kept secret and protected.
- Authentication vs confidentiality: asymmetric encryption provides mechanisms (e.g., digital signatures) to authenticate senders, but simply encrypting with a public key does not on its own remove the need for authentication or key validation (certificates, CA).

2. Step-by-step reasoning process
- Management generates a key pair: PublicKey_M and PrivateKey_M.
- Management publishes PublicKey_M to employees (can be shared openly).
- Employee encrypts a confidential report using PublicKey_M.
- Encrypted report sent over the internet; only PrivateKey_M can decrypt it.
- If PrivateKey_M is exposed, confidentiality is lost; hence PrivateKey_M must remain secret.

3. Intermediate steps / illustrative flow
- Generate keys → Distribute public key → Employee: CipherText = Encrypt(PlainText, PublicKey_M) → Management: PlainText = Decrypt(CipherText, PrivateKey_M).

4. Why the correct answers are correct
- "The public key can be shared openly": True, because public keys are meant to be distributed so senders can encrypt messages.
- "The private key must remain secret": True, because only the private key holder can decrypt messages; if leaked, security is compromised.

5. Why the other options are incorrect
- "The same key is used for both encryption and decryption": Incorrect; that describes symmetric encryption, not asymmetric.
- "Asymmetric encryption removes the need for authentication": Incorrect; encryption alone doesn’t authenticate the sender or validate keys—authentication mechanisms (certificates, signatures) are still required.

6. Conclusion
Both correct statements are: "The public key can be shared openly" and "The private key must remain secret" — matching the provided answer.

A company wants employees to securely send confidential reports to management over the internet. The company decides to use asymmetric encryption. Which TWO statements about asymmetric encryption are correct?多项选择题

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