# Rejected Key Schemes ## 3-of-5 & 4-of-5 Key Scheme In the previous section addressing the design decisions for the 2/5 scheme, human error was listed as a reasoning for the 2/5 design. Suppose that a 3/5 or above scheme was used, and cryptographic parts were lost, the risk of losing funds would increase significantly as well. ## 1-of-5 Key Scheme The 1/5 scheme simply does not work because if one of the cryptographic parts were to be compromised, funds would be lost. --- # 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://docs.cypherock.com/design-decisions/using-shamir-secret-sharing-vs.-multi-sig/rejected-key-schemes.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.