# Quiz 49 Which of the following are problems associated with Public Key Infrastructure (PKI)? (Choose all that apply) **Add answers and select the correct ones** * [x] A compromised Certificate Authority can infiltrate all network participants * [x] Sensitive information stored in a single location creates a big incentive for attacks * [ ] PKI does not use encryption for communication * [ ] PKI cannot authenticate digital identities **Note to Learners** You may have noticed there are a couple of major security problems with PKI systems: 1. If an attacker gains control of the Certificate Authority, they then gain the ability to infiltrate all network participants' systems... 2. Storing all sensitive information in a single location creates a big incentive to attack or try to infiltrate said location... To learn more about it, you can follow the course [Double Hashing and BSV's Security](https://bsvblockchain.360learning.com/course/play/68bead673b7af35da91fc446) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/bitcoin-primitives-hash-functions/quiz-bitcoin-hash-functions/quiz-49.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.