The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2025
Filed:
Aug. 19, 2023
Microsoft Technology Licensing, Llc., Redmond, WA (US);
Colin Bruce Clement, Seattle, WA (US);
Shengyu Fu, Redmond, WA (US);
Neelakantan Sundaresan, Bellevue, WA (US);
Dongjiang You, Kirkland, WA (US);
Microsoft Technology Licensing, LLC., Redmond, WA (US);
Abstract
A technique to prevent a prompt injection attack utilizes a security agent to sign a large language model prompt with a secret that is isolated from the user application or device that generates a user prompt. The secret is tailored for a specific user identifier and session identifier. The large language model is instructed to repeat the secret in each response. The security agent retrieves the response from the large language model and checks for the secret. When the secret is not part of the response, an error message is forwarded to the user application instead of the response.