What are common uses for asymmetric encryption?

What are common uses for asymmetric encryption?

• A. Digital Signatures, Blockchain, PKI
• B. Authentication, Authorization, Accounting
• C. Data Integrity, Data Recovery
• D. Public Key Infrastructure only

Answer: (A)

The main idea here is how asymmetric encryption enables activities that rely on a public key and a private key to prove identity, ensure authenticity, and manage trust. With asymmetric cryptography, you can sign data with a private key so others can verify the signature using the corresponding public key. This underpins digital signatures, which provide authenticity and non-repudiation. That same principle is foundational to PKI, where certificates bind a public key to a verified identity and establish trust across systems. Blockchain also relies on these techniques: participants sign transactions with their private keys, and others verify those signatures with public keys, ensuring that only the rightful owner can authorize a transfer and that the history of transactions remains verifiable. So the best answer lists digital signatures, blockchain, and PKI because they are direct, well-known uses of asymmetric encryption. The other options describe broader IT concepts (authentication, authorization, accounting) or combine functions in ways that aren’t specific primary uses of asymmetric encryption (data integrity can be achieved via signatures, but data recovery isn’t a cryptographic use; PKI alone is a subset of what asymmetric cryptography enables).

The main idea here is how asymmetric encryption enables activities that rely on a public key and a private key to prove identity, ensure authenticity, and manage trust. With asymmetric cryptography, you can sign data with a private key so others can verify the signature using the corresponding public key. This underpins digital signatures, which provide authenticity and non-repudiation. That same principle is foundational to PKI, where certificates bind a public key to a verified identity and establish trust across systems.

Blockchain also relies on these techniques: participants sign transactions with their private keys, and others verify those signatures with public keys, ensuring that only the rightful owner can authorize a transfer and that the history of transactions remains verifiable.

So the best answer lists digital signatures, blockchain, and PKI because they are direct, well-known uses of asymmetric encryption. The other options describe broader IT concepts (authentication, authorization, accounting) or combine functions in ways that aren’t specific primary uses of asymmetric encryption (data integrity can be achieved via signatures, but data recovery isn’t a cryptographic use; PKI alone is a subset of what asymmetric cryptography enables).