Which two digital signature algorithms are commonly used in cipher suites?

The correct choice identifies RSA and DSA as the two commonly used digital signature algorithms in cipher suites.

RSA (Rivest-Shamir-Adleman) is one of the first public-key cryptosystems and is widely used for secure data transmission. It allows for both encryption and signing, making it a foundational technology in various cryptographic protocols, including SSL/TLS used for secure web traffic. RSA provides a robust mechanism for ensuring authenticity and integrity through signatures.

DSA (Digital Signature Algorithm) is another public-key algorithm specifically designed for digital signatures. It is used predominantly in conjunction with the Digital Signature Standard (DSS) and is recognized for its efficiency and strong security profile in generating and verifying signatures.

Understanding the relationship between these algorithms and their functions within cipher suites is essential for grasping how digital signatures help ensure secure communications in cryptographic protocols. While other options do mention algorithms related to security, they either focus on hashing functions (like SHA) or encryption methods (like AES) that do not serve as digital signature algorithms. Familiarity with these distinctions is crucial in recognizing the roles that each algorithm plays in secure communications.