Which cryptographic algorithm is widely used in PKI encryption?

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To begin, let’s identify what PKI encryption typically relies on. PKI (Public Key Infrastructure) primarily uses public-key cryptography to enable secure key exchange, digital signatures, and certificate-based authentication.
Option a: a. RSA (Rivest-Shamir-Adleman). This is the classic public-key algorithm widely used in PKI for encryption and digital signatures. Its role in PKI stems from its ability to securely enable key exchange and authentication when paired with certificates in systems like X.509.
Option b: b. SHA-256 (Secure Hash Algorithm 256-bit). This is a cryptographic hash function, not an encryption algorithm. Hashes are used for data integrity checks and digital signatures, but they do not perform encryption or provide confidentiality by themselves.
Option c: c. AES (Advanced Encryption Standard). AES is a symmetric-key encryption algorithm, meaning the same key is used to encrypt and decrypt. PKI, however, relies on asymmetric (public-private key) mechanisms for key distribution and authentication, so AES is not the primary PKI encryption algorithm.
Option d: d. SHA-512 (Secure Hash Algorithm 512-bit). Like SHA-256, this is a hash function, not an encryption algorithm. While stronger hashing can be part of a digital signature process, it does not perform encryption in PKI contexts.
In summary, option a is correct because RSA is the widely used public-key algorithm in PKI, whereas the other options refer to hash functions or symmetric encryption, which do not fulfill the primary PKI role of public-key encryption and key management.

Introduction to Security and Forensic Technologies (CT046-3-1-ISFT-25-RESIT)

Which cryptographic algorithm is widely used in PKI encryption?

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