Security in software development: How to protect...

> Key Takeaway: Security in software development starts with the Security-by-Design principle and includes input validation, secure authentication (OAuth 2.0, MFA), encrypted data transmission and storage, regular dependency updates, and automated security tests in the CI/CD pipeline.

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In a world where cyber attacks are becoming increasingly sophisticated and data protection regulations such as the GDPR impose strict requirements, security in [software development](/services/software development) is no longer an option but a necessity.

In this article you will learn how professional software development security integrates from the beginning and what measures your applications protect.

The threat situation

Short: According to current studies, over 2,200 cyber attacks are reported daily.

According to current studies, over 2,200 cyber attacks are reported daily. The average cost of a data leak is over EUR 4 million. Prevention is significantly cheaper than damage elimination.

Security by Design: Security from the beginning

Short: Security by Design means that security aspects are not added subsequently, but are taken into account from the beginning of the development process.

Security by Design means that security aspects are not added subsequently, but are taken into account from the beginning of the development process. This approach is significantly more effective and cheaper than the subsequent patching of vulnerabilities.

Principle Description

Least privilege Each component receives only the minimum necessary authorizations

**Defense in Depth * * Several security levels protect against various types of attack

Fail Secure In the event of a fault, a safe state is changed

**Input validation * * All inputs are validated and cleaned

**Secure defaults * * Standard configurations are safe, not open

The OWASP Top 10: The most common security risks

Short: Open Web Application Security Project (OWASP) regularly publishes a list of the most critical security risks for web applications.

Open Web Application Security Project (OWASP) regularly publishes a list of the most critical security risks for web applications. Each developer should know these:

1. Injection (SQL, NoSQL, OS) Attackers insert harmful code via input fields. Protection: Prepared statements, parameterization, input validation.

Two. Broken Authentication Vulnerabilities in authentication allow unauthorized access. Protection: Multi-factor authentication, secure session management.

3. Sensitive data exposure Inadequate protection of sensitive data. Protection: encryption in transit and at rest, secure key management.

4. XML External Entities (XXE) Attacks via XML-Parser. Protection: Deactivation of external entities, use of safe parser.

5. Broken Access Control Inappropriate access control. Protection: role-based access control, server-side validation.

Safety measures in practice

Encryption

• TLS/HTTPS: All data transfers encrypted

• Data encryption: Sensitive data encrypted in the database

• Password-Hashing: Secure algorithms such as bcrypt or argon2

Authentication and Authorization

• OAuth 2.0 / OpenID Connect: Modern authentication standards

• JWT (JSON Web Tokens): Secure token-based authentication

• Multi-factor authentication: Additional security level

Code security

• Static Application Security Testing (SAST): Automatic Code Analysis

• **Dynamic Application Security T

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Transparency: Where no primary source is named in the text, figures are illustrative; compare Bitkom and Destatis. Project-related statements: Groenewold IT, 2026.

References and further reading

Short: The following independent references complement the topics in this article:

The following independent references complement the topics in this article:

• Bitkom – German digital industry association
• German Federal Office for Information Security (BSI)
• European Commission – Digital strategy
• MDN Web Docs (Mozilla)
• W3C – World Wide Web Consortium

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