Cryptography in Practice: How Developers Can Stop Fearing AES, RSA, and TLS 1.3

## Cryptography in Practice: How Developers Can Stop Fearing AES, RSA, and TLS 1.3 Every day we use encryption: sending messages in messengers, entering passwords on websites, signing documents with electronic signatures. But when it comes to implementing cryptography in our own code, many developers get lost. Why? Because university courses are often overloaded with theory, and in practice you have to deal with vulnerabilities that arise from incorrect algorithm selection or misconfiguration. The course **"Cryptography in Practice"** on the asibiont.com platform is designed precisely to fill this gap. This is not another lecture on the mathematical foundations of encryption, but a practical immersion into tools that are actually used in production: from symmetric ciphers AES and ChaCha20 to asymmetric schemes RSA and ECC, including modern Ed25519 and AEAD. And most importantly, you will learn how to configure PKI and TLS 1.3 so that your applications are protected "out of the box." ## What Will You Learn in the Course? The course covers all key areas that a modern developer needs to work with cryptography. Here are the main blocks: - **Symmetric Encryption:** AES in various modes (GCM, CBC, CTR) and ChaCha20 — algorithms that underpin data protection at rest (disks, databases) and in transit (TLS, SSH). - **Asymmetric Encryption and Signatures:** RSA, ECC (elliptic curve based) and Ed25519 — a modern standard for digital signatures used in blockchain, Git (commit signing) and SSH keys. - **Hashing and Authenticated Encryption (AEAD):** SHA-2, SHA-3 and AEAD modes (AES-GCM, ChaCha20-Poly1305), which guarantee not only confidentiality but also data integrity. Without AEAD, your encryption can be broken by padding oracle attacks or bit manipulation. - **PKI (Public Key Infrastructure):** creating and managing X.509 certificates, trust chains, CRL and OCSP. This is the foundation for HTTPS and TLS. - **TLS 1.3:** configuring and auditing the protocol used by 97% of websites today (SSL Labs data, 2025). You will learn why TLS 1.3 is faster and more secure than its predecessors, and how to avoid common implementation mistakes. - **Post-Quantum Threats:** NIST approved the first post-quantum algorithms (CRYSTALS-Kyber, CRYSTALS-Dilithium) in August 2024. In the course, you will understand which current schemes are vulnerable to quantum computer attacks and how to prepare now. ## Who Is This Course For? The course is aimed at developers (backend, fullstack, DevOps) and information security professionals who already have basic knowledge of how networks and protocols work. If you write code that processes payment data, logins, or medical information, this course is for you. It will also be useful for engineers implementing Zero Trust architectures or working with blockchain applications where cryptography is the foundation of security. You don't need to be a mathematician: all algorithms are explained at a level sufficient for their correct application. But you should understand what bytes, bits, and TCP/IP are. ## How Does Learning Work on asibiont.com? The asibiont.com platform uses AI generation of personalized lessons. This means each student receives a program adapted to their current level and goals. The neural network analyzes your answers, learning pace, and topic complexity to offer exactly the materials you need at the moment. Learning takes place in a text format — this allows you to delve deeper into details, revisit complex points, and study at your own pace. The AI tutor explains complex concepts (e.g., the difference between ECDHE and ECDSA, or how the TLS handshake works) in simple language, using analogies and practical examples. You can ask the neural network questions during the learning process — it will guide you on where to find the answer or provide additional clarification. This approach is especially effective for technical topics where accuracy matters. The text format allows you to see source code, configurations, and commands in their pure form, without needing to rewatch videos. And 24/7 access allows you to learn at any time — whether early morning or late evening. ## Why Is AI Learning Modern and Effective? Traditional online courses often suffer from "one size fits all": the program is fixed, and if you already know half of it, you still have to go through it from the beginning. AI learning on asibiont.com solves this problem: - **Personalization:** the neural network determines your level with an entry test and dynamically adjusts the program. If you are well-versed in symmetric encryption but don't know PKI, the course will focus on weak points. - **Explaining Complex Topics:** AI can break down ECC math into simple analogies (e.g., comparing an elliptic curve to a billiard ball). This lowers the entry barrier. - **Practical Assignments:** instead of abstract tasks, you get realistic scenarios: configure TLS 1.3 on Nginx, encrypt a file with openssl, sign a document using Ed25519. All tasks are automatically checked, and AI provides feedback. According to McKinsey research (2023), personalized learning increases material retention efficiency by 30-40% compared to traditional methods. And it makes sense: when the program is tailored to you, you don't waste time on things you already know and don't get stuck on unclear topics. ## Practical Examples from the Course Here are a few real tasks you will learn to solve after completing the course: 1. **Setting up HTTPS with TLS 1.3 on a web server:** you will learn how to generate a self-signed certificate (for a test environment) and configure the correct cipher suite (e.g., TLS_AES_256_GCM_SHA384). You will also be able to check the configuration with SSL Labs and fix common mistakes like using outdated ciphers. 2. **Encrypting data in a database:** you will master how to securely store passwords (via bcrypt or Argon2), and encrypt columns with sensitive data (e.g., credit card numbers) using AES-256-GCM. 3. **Creating a PKI for internal infrastructure:** you will set up your own certificate authority (CA), issue certificates for microservices, and configure mutual authentication (mTLS). This is the foundation for Zero Trust networks. 4. **Digital signing of containers and artifacts:** you will learn to sign Docker images with cosign (using Ed25519) and verify their integrity before deployment. ## Conclusion Cryptography ceases to be magic when you understand how algorithms work and how to apply them correctly. The course **"Cryptography in Practice"** on asibiont.com gives exactly these skills: from AES and ChaCha20 to configuring PKI and TLS 1.3, taking into account post-quantum threats. You won't just learn theory — you will be able to implement secure protocols in your applications as early as tomorrow. If you are tired of vulnerabilities and want to write code that you are not ashamed to show to a security auditor, start learning on asibiont.com. Go to the course page [Cryptography in Practice](https://asibiont.com/en/course/cryptography) and take the first step toward real protection of your projects.

Cryptography in Practice: How Developers Can Stop Fearing AES, RSA, and TLS 1.3

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