A practical, worked-example course on the minimum mathematics an engineer needs to understand why cryptographic primitives are hard to break: modular arithmetic, the greatest common divisor, primes and Euler's totient, groups and discrete logarithms, and finite fields. Every piece of arithmetic is computed and verified on small numbers you can check yourself, building up one running RSA example end to end rather than asking you to take any claim on faith.
Nothing. Every course, exam, and certificate on the catalog is free — including retakes. All you need is a free Safeguard account.
None. The flagship course, Safeguard Certified Practitioner, is a beginner-level course — basic familiarity with how software is built helps, but every exam question is answerable from the lessons themselves.
You can retake it after a 24-hour cooldown, as many times as you need. Retakes are free, and each attempt draws a fresh random set of questions.
The Safeguard Certified Practitioner credential is valid for 24 months from issue. The expiry date is printed on the certificate and shown live on its public verification page. Renewing means passing the current exam again.
