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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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