Securing Systems

For purposes of establishing your Gradebook in this course, we only collect your GitHub username in Assignment 0, so if for any reason you are doing these assignments out of order (which is not advised!), know that you won’t have a gradebook until Assignment 0 is submitted and returned to you.

On 5 January 2026, the course’s Gradebook performed its annual “reset”. Your past progress is not automatically lost, however, so do not instinctively resubmit this assignment if you have already earned a passing grade on it. Please read cs50.harvard.edu/cybersecurity/faqs/#i-completed-an-assignment-or-this-course-in-a-prior-year-why-does-my-gradebook-no-longer-show-my-prior-progress for more information.

If your course is incomplete at the time of the gradebook reset, not to worry. Simply continue where you left off, and your older scores will (subject to the above FAQ) import once any newly-submitted work is graded in 2026!