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Encoding, cryptography and tokens
Read a token, recognize how data is protected and test whether the application actually trusts it. Progress from URL and Base64 encoding to hashes, password protection, webhook signatures, encryption modes and JWT verification. Connect each mechanism to the problem it is meant to solve.
PLN 349planned price including tax
In your browser · No installation · Tutor and narration
Open your browser. Start learning.
Do not spend your first evening configuring an environment. The application, tools and task context are in one place. You do not need Docker, a VPN, a virtual machine or paid software.
A virtual tutor walks you through the example and highlights important parts of the application, code or tool. Connect the instruction to what is happening on screen.
Narration explains the mechanism, decision and result. Pause the guidance, return to an earlier step and work through it at your own pace.
Take over in the exercise: change data, run a test or make a decision. Compare the result and improve your solution using the explanation.
One environment, without switching between a video and a local installation. Tools fit the topic: from HTTP requests and code to a terminal, calculator or document. Practice in simulators and prepared cases, without attacking other people's systems.
What will you be able to do?
Do not judge token security by whether it looks random. Check the property the mechanism provides and how the recipient uses it.
Encoding, hashing and encryption sound like similar protections.
Classify example values and explain whether reading them is normal or indicates an issue.
You can read a JWT but do not know what must be verified.
Connect a token change to the recipient's response. Identify the missing control instead of reporting readability alone.
You assume a signed webhook is secure without asking further questions.
Compare valid, modified and replayed messages. Distinguish signature verification from timestamp and event-identifier checks.
Use this knowledge to assess tokens, webhooks and cryptographic use in applications, without designing your own algorithms.
Connect each skill to a concrete work product. Return to explanations while you practice.
A syllabus backed by materials
See what makes up the syllabus: lessons, explanations, examples and exercises. The figures below describe different types of materials.
The figures describe the English-language source materials. The waiting list is for the planned Polish edition. These counts do not mean its translation is complete. Demonstration steps, examples and tasks are different units, not hours of video or counts of unique vulnerabilities.
Entry point
Available in Polish and English — you can switch language at any time. Command names, code snippets and standard identifiers remain in their original form.
How you learn
The tutor walks through an example and explains each decision. In the exercise, return to the context, check the result and improve your answer.
Goal, constraints and inputs. Know what you are testing and why.
Watch a demonstration with tutor commentary, step by step.
Work with data, a tool or a scenario. Compare the result with your expectation.
Justify your decision and understand its limitations. Return to anything that needs improvement.
Exercises use simulators and selected mechanisms that run in the browser. They do not require attacking other people's systems.
Planned syllabus
Each area develops a specific skill. Learn not only the topic but also the action and outcome that learning leads to.
Each topic includes a skill and a concrete exercise outcome.
I want to join the listIdentify a value's alphabet, separators, length and usage context. Form a hypothesis about the format and test it with an appropriate transformation. Learn to describe cases where appearance alone cannot identify an algorithm.
Workshop with prepared data
Practice URL, Base64 and Base64URL encoding and Unicode character representations. Trace decoding and normalization order across application layers. See how different interpretations of the same value affect a filter and data recipient.
Tutor-guided exercise
Choose a mechanism for confidentiality, integrity, authenticity or message freshness. Compare hashing, HMAC, signing and encryption in concrete uses. Explain why compression and encoding cannot replace these protections.
Case analysis
Analyze a token's header, payload, signature or encryption. Check issuer, audience, validity, type, claim scope and key selection. Connect token verification to separate authorization for the requested operation.
Tutor-guided exercise
Determine which message bytes are signed and how the recipient checks authenticity. Compare a valid message with modified content, an invalid signature and a replayed event. Prepare requirements for timestamps, event identifiers and replay protection.
Tutor-guided exercise
Recognize hash formats and the role of salts and computational cost in password protection. Compare a fast general-purpose hash with a password-storage mechanism. Distinguish visible properties from information requiring code or configuration.
Case analysis
Learn the role of keys, initialization vectors, nonces and integrity checks. Analyze misuse of encryption modes and repeated values in supplied examples. Identify the required security property instead of judging a solution only by its algorithm name.
Case analysis
Identify the purpose of key material and the relationship between public and private keys. Trace verification-key selection and distribution. Connect certificate and trust information to a specific integration.
Case analysis
Review code that accepts a token or signed message and identify an omitted check. Connect the observed response to its cause, such as trusting unverified claims. Propose a change in the data recipient, not just a cosmetic format change.
Case analysis
Prepare valid, modified, expired and replayed messages. Check rejection of invalid values and preservation of legitimate integration. Summarize the security property, observations and recommendation.
Workshop with prepared data
In practice
Each case has context, a concrete action and an outcome. The goal is not to memorize a command but to understand why the result changed.
Recognize the representation, read claims and check recipient requirements. Compare responses to content changes and the conditions for valid verification and resource access.
Work productA token analysis sheet with signature, claim and authorization tests.
Identify the signed content, then compare a valid message with modified and replayed versions. Explain the role of time, event identifiers and recipient-side checks.
Work productWebhook verification cases and an integration recommendation.
Certificate of completion
When you complete the course, the certificate is issued automatically and emailed to you. It shows your name, the date of issue and a unique code, and its second page lists the course scope.
Code verification: cyberszkola.pl/verify
Upcoming standalone course
Planned course price
Polish edition · Launch date not yet announced
Notify me at launchJoining is free. Before sales open, you will receive the date, full scope and purchase terms. We are not taking payments today. This is a separate interest list, not a place reservation or purchase.
For companies and teams
Compatible with LMS platforms including:
and other platforms that support e-learning standards.
Price for companies
Delivery into your company's own LMS from 50 licences.
Ask for a quoteWrite to [email protected]: the number of people, the courses you want and your LMS, if you use one.
Project author
Creator of Cyberwiedza, cyberszkola and AI SecLabs. In these courses, I connect explanations of mechanisms with practice, observation and decisions you need to justify.
Running a command is not enough. What matters is what its output confirms, what it does not confirm and what the next step should be.
More about the authorBefore joining
No. The course focuses on understanding how mechanisms are used and misused. Analyze formats, code and application responses instead of deriving cryptographic algorithms.
Not by itself. Exercises also check the signature, claims and permissions. Learn to explain whether you are seeing a normal data representation or a missing control.
No. This is an upcoming course announcement and an interest list. Joining is not a purchase, a place reservation or a commitment to pay.
The launch date, price and access terms will be announced before sales open. The interest list is how we send that information.
The course is available in Polish and in English — you can switch language at any time, and lessons, exercise explanations and narration exist in both. Commands, code and tool names keep their original syntax, as used in everyday work.
No. All course exercises run in your browser on a computer with internet access. Training applications, terminals, editors and workshops are part of the platform. You do not install Docker, a virtual machine or a VPN, and you do not need paid external tools.
No. You work in an interactive environment. A virtual tutor highlights important elements, and narration explains the action and its result. Pause the lesson, return to earlier steps and run your own experiments. This guidance is built into the course, not individual consultation with a person.
No. You use training applications, simulators and prepared data. Learn the mechanism and its limitations in a safe environment. External resources are supplementary, not required to complete the exercises.
Yes, a certificate of completion. When you complete the course, you receive a certificate in English with a unique code that anyone can check at cyberszkola.pl/verify. It confirms completion of the course and is issued by the author; it is not an industry certification. We do not promise employment.
No. These are independently authored courses using public references and original cases. They do not replace licensed standards, accreditation or qualifications required in regulated industries.
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Planned price: PLN 349 including tax