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      Question

      In the context of asymmetric encryption, which of the

      following is a key feature of public-private key pairs?
      A Both keys can encrypt and decrypt data interchangeably. Correct Answer Incorrect Answer
      B Only the private key is used for encryption Correct Answer Incorrect Answer
      C The public key can decrypt data encrypted by the private key Correct Answer Incorrect Answer
      D The private key is shared between sender and receiver Correct Answer Incorrect Answer
      E Public-private key pairs are primarily used for hashing. Correct Answer Incorrect Answer

      Solution

      Asymmetric encryption uses a pair of keys: a public key, shared openly, and a private key, kept confidential. In this system:

      • Data encrypted using the private key can be decrypted by the corresponding public key , which is essential for digital signatures. For instance, signing a document with a private key allows recipients to verify its authenticity using the public key.
      • Conversely, data encrypted with the public key can only be decrypted with the private key , ensuring secure transmission of sensitive information.
      This separation of keys ensures confidentiality, integrity, and authentication. It is widely used in protocols like SSL/TLS and applications such as secure email and blockchain. Why Other Options Are Incorrect:
      • Option A: While the keys are mathematically related, they are not interchangeable for encryption and decryption.
      • Option B: The private key is not solely for encryption; it is often used for decryption or signing.
      • Option D: The private key must remain confidential and is never shared between parties.
      • Option E: Public-private key pairs are not directly used for hashing, which is a different cryptographic operation.

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