A software developer wants to implement an application security technique that will provide assurance of the application's integrity. Which of the following techniques will achieve this goal?

Secure cookies are used to enhance the security of web applications by ensuring that cookies are transmitted over secure connections and are protected from unauthorized access. However, they do not directly provide assurance of the integrity of the application's code or its functionality, which is the primary goal of the question.

Input validation is a technique that ensures only properly formatted data is accepted by an application, thereby preventing malicious inputs. While it enhances the security of the application by mitigating risks like injection attacks, it does not provide assurance regarding the integrity of the application's code itself.

Static analysis involves examining the source code for potential vulnerabilities or coding errors without executing the program. While it helps identify security flaws, it does not offer a guarantee that the application has not been tampered with after the analysis, nor does it confirm the integrity of the application as a whole.