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 encryption algorithm that provides confidentiality, but it uses a single shared secret key and does not involve asymmetric key exchange or directly provide integrity without additional mechanisms.

The Digital Signature Algorithm (DSA) is an asymmetric cryptographic algorithm used to generate digital signatures. Digital signatures provide strong assurance of data integrity (ensuring the message has not been altered) and sender authenticity (proving the sender's identity), and are fundamental in establishing trust in asymmetric key exchanges that lead to confidential communication channels.

SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function used to provide data integrity by detecting changes in data, but it does not provide confidentiality or involve asymmetric key exchange.

MD5 (Message Digest 5) is a cryptographic hash function primarily used for data integrity, but it does not provide confidentiality, involves no asymmetric key exchange, and is considered cryptographically insecure for many applications due to collision vulnerabilities.