A practitioner-level course on how symmetric ciphers actually protect data once a key exists: block cipher structure, the Advanced Encryption Standard, and the modes of operation, Electronic Code Book, Cipher Block Chaining, Counter mode and Galois Counter Mode, that turn a fixed-size cipher into a working encryption system. You will finish able to name what each mode guarantees, what it does not, and the exact configuration mistake, especially nonce and initialisation vector reuse, that breaks it in production.
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.
