Which of the following is used to provide both data integrity and confidentiality using an asymmetric key exchange?

AES (Advanced Encryption Standard) is a symmetric block cipher that provides confidentiality but uses a shared secret key, not an asymmetric key pair, and does not produce digital signatures for integrity.

DSA is an asymmetric algorithm that uses a private key to sign data and a corresponding public key to verify the signature, ensuring that data has not been tampered with (integrity). In a PKI-based system, asymmetric key exchange using DSA or related algorithms also facilitates secure key establishment, enabling confidentiality for the overall communication session.

SHA-1 is a cryptographic hash function that produces a fixed-length digest to verify data integrity, but it neither uses asymmetric keys nor provides confidentiality.

MD5 is a hash function that generates a 128-bit digest for basic integrity checking; it does not use asymmetric keys and provides no confidentiality, and it is also considered cryptographically broken.