312-50V9 · Question #159
Which of the following levels of algorithms does Public Key Infrastructure (PKI) use?
The correct answer is A. RSA 1024 bit strength. PKI relies on RSA asymmetric encryption, and RSA 1024-bit was historically the standard minimum key strength used in PKI implementations.
Question
Which of the following levels of algorithms does Public Key Infrastructure (PKI) use?
Options
- ARSA 1024 bit strength
- BAES 1024 bit strength
- CRSA 512 bit strength
- DAES 512 bit strength
How the community answered
(33 responses)- A88% (29)
- B6% (2)
- C3% (1)
- D3% (1)
Why each option
PKI relies on RSA asymmetric encryption, and RSA 1024-bit was historically the standard minimum key strength used in PKI implementations.
PKI uses RSA, an asymmetric algorithm, for key pair generation and digital signatures. RSA 1024-bit was the widely accepted baseline key length for PKI certificate-based authentication. AES is a symmetric cipher and is not used for PKI key pairs, making RSA the only applicable algorithm among the choices.
AES is a symmetric encryption algorithm, not an asymmetric algorithm, so it is not used in PKI for public/private key pair generation.
RSA 512-bit is considered cryptographically weak and deprecated - it can be factored with modern computing resources and is not a valid PKI key strength.
AES is a symmetric block cipher and does not support the public/private key pair model that PKI requires.
Concept tested: PKI asymmetric encryption algorithm and key strength
Source: https://learn.microsoft.com/en-us/windows/win32/seccertenroll/about-public-key-infrastructure
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