# Internal Service Provider Attack This is a common source of loss for custodial services. Internal employees often have access to databases and servers hosting the company's keys. The Shapeshift exchange was the victim of [one such attack](https://web.archive.org/web/20160421170714/https://www.coindesk.com/digital-currency-exchange-shapeshift-says-lost-230k-3-separate-hacks). Other exchanges have been attacked, not by employees, but by attackers that gain access to employee [credentials](https://web.archive.org/web/20150706043206/http://www.coindesk.com/unconfirmed-report-5-million-bitstamp-bitcoin-exchange/) or laptops. Employees are also in the best position to push out malicious software to their unwitting customers. **Mitigation:** * Not your keys, not your coins. Use sovereign products that give you key control. * Redundancy: your key management system should not depend on trusting a single manufacturer or software. For example, if using hardware wallets, the wallet firmware can provide checks and balances on the provider of your key management software. --- # 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.casa.io/wealth-security-protocol/threat-overview/internal-service-provider-attack.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.