Encryption

Encryption, Encryption, Data encryption, Data encryption, Security by encryption
Encryption converts readable data into unreadable code so that only authorized parties can access it. Crucial for customer data and online payments.

What is encryption?

Encryption is a security technique that converts readable data into unreadable code using a mathematical algorithm and a digital key. Only parties with the correct decryption key can see the original information again. This technique protects sensitive data such as customer data, passwords and payment information from unauthorized access, both during transmission over the Internet and when stored on servers. For SMBs, encryption is essential when processing personal data according to the AVG and handling online transactions securely.

How encryption works technically

In encryption, an algorithm performs a series of mathematical operations on the original data. This process uses a key, a unique set of bits that determines how the data is transformed. There are two main types: symmetric encryption in which the same key encrypts and decrypts, and asymmetric encryption with a public key for encryption and a private key for decryption. Modern encryption standards such as AES-256 use keys of 256 bits, yielding billions of possible combinations. This makes brute-force attacks virtually impossible. The strength depends on three factors: the length of the key, the quality of the algorithm and how securely you manage the keys.

From military technology to everyday Internet use

Encryption originally originated in military contexts, where secret messages needed to be protected from enemy interception. With the rise of the Internet in the 1990s, encryption became accessible for commercial use. The introduction of SSL certificates made it possible to secure Web traffic. Today, encryption is standard in virtually all online communications. Every website with HTTPS, every WhatsApp message and every online payment uses encryption. For SMEs, this is no longer a nice-to-have but a legal requirement under the AVG when processing personal data. Customers also expect their data to be handled securely, which makes encryption a competitive factor.

What encryption brings to your business

Als MKB-ondernemer bescherm je met versleuteling de gegevens van je klanten tegen datalekken en cyberaanvallen. Dit verlaagt het risico op boetes van de Autoriteit Persoonsgegevens en voorkomt reputatieschade. Bij een webshop zorgt versleuteling ervoor dat betalingsgegevens veilig worden verwerkt, wat essentieel is voor klantvertrouwen. Ook interne communicatie via e-mail of projectmanagement-tools blijft vertrouwelijk. In de praktijk zien we bij MKB-klanten dat een goede technische basis met versleuteling de eerste stap is naar AVG-compliance. Het voorkomt dat gevoelige offertes, contracten of klantdossiers in verkeerde handen vallen. Voor bedrijven die met authenticatie en inloggegevens werken, is versleuteling van wachtwoorden in databases onmisbaar.

Applications of encryption

Versleuteling komt in de dagelijkse bedrijfsvoering op meerdere plekken voor, vaak zonder dat je het direct merkt. De techniek beschermt data zowel tijdens transport over netwerken als bij opslag op servers en apparaten. Hieronder vier concrete situaties waarin versleuteling voor MKB-bedrijven directe waarde heeft.

Secure website communication via HTTPS

Elk modern websitebezoek gebruikt TLS-versleuteling, herkenbaar aan het slotje in de adresbalk en de HTTPS-prefix. Dit versleutelt alle data die tussen de browser van je bezoeker en jouw webserver reist. Zonder HTTPS kunnen derden op het netwerk meelezen, bijvoorbeeld bij gebruik van openbare wifi. Voor een webshop met 500 producten en een gemiddelde orderwaarde van 75 euro betekent dit dat klantgegevens, inloggegevens en betalingsinformatie beschermd zijn tijdens het bestelproces. Google geeft HTTPS-sites ook een lichte ranking-boost, wat dit tot een SEO-factor maakt. Binnen een professioneel webdesign-traject is een geldig SSL-certificaat standaard onderdeel van de oplevering.

Encrypted email communication with customers and suppliers

Email encryption prevents sensitive messages from being intercepted during transmission. This is relevant when sending quotes, contracts or personnel files. There are two levels: transport encryption between mail servers (TLS) and end-to-end encryption where only sender and receiver can read the content. For a consulting firm with 12 employees that regularly shares confidential client information, encrypted e-mail provides an additional layer of security. Note that standard e-mail is not end-to-end encrypted, meaning your mail provider can technically read along. Highly sensitive communications require solutions such as S/MIME or PGP, or use a secure portal instead of e-mail.

Protection of stored customer data in databases

Versleuteling van data-at-rest beschermt informatie die op harde schijven, servers of in de cloud staat opgeslagen. Als een server wordt gestolen of een back-up in verkeerde handen valt, blijven de gegevens onleesbaar zonder de decoderingssleutel. Dit is cruciaal voor AVG-compliance, vooral bij het opslaan van bijzondere persoonsgegevens zoals gezondheidsdata of financiële informatie. Een webshop die klantnamen, adressen en aankoopgeschiedenis opslaat, moet deze data versleutelen om het risico op datalekken te beperken. In de praktijk zie je dat goede hosting-providers database-versleuteling standaard aanbieden, maar het blijft jouw verantwoordelijkheid om dit te controleren en te activeren.

Secure backups and disaster recovery

Backups often contain a full copy of your corporate data. If these are stored unencrypted on an external hard drive or cloud storage, you create a security risk. Encrypted backups ensure that even in the event of theft or unauthorized access, the data remains unusable. For a B2B service provider with five years of client projects on file, this is essential. Pay attention to key management: if you lose the decryption key, you won't be able to access the backup yourself either. Therefore, keep keys in a secure, separate location. A common mistake is storing the key in the same cloud environment as the encrypted backup, which negates the protection.

When encryption is the right choice and when it is not

Encryption always makes sense when processing personal data, financial data or confidential business information. It is required by law under the AVG for high-risk data processing. Encryption is less urgent for fully public content such as blog articles or product descriptions, although HTTPS is the standard there too. One scenario where encryption doesn't help: if an attacker gains access to a logged-in session or steals the keys themselves. Encryption protects data, but does not replace good access control, strong passwords or two-factor authentication. Think of it as one layer in a broader security strategy, not a stand-alone solution.

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Frequently Asked Questions

No, encryption and passwords are two different layers of security. A password controls access to a system or file, while encryption renders the content itself unreadable. You can have an encrypted file without a password, and a password-protected file without encryption. In practice, they work together: a password protects access, encryption protects the data itself. If someone steals your password, that person can log in but still not see readable data with good encryption. For optimal security, combine both: strong passwords for access control and encryption for data protection. Many systems also encrypt passwords themselves in the database via hashing, a one-way encryption technique.

Symmetric encryption uses a single key for both encryption and decryption and is fast and efficient for large data volumes. This fits well for file or database storage where you manage both sides yourself. Asymmetric encryption uses a key pair: a public key to encrypt and a private key to decrypt. This is ideal for communications between parties that do not fully trust each other, such as e-mail or online payments. In practice, you often see a combination: asymmetric encryption to securely exchange a symmetric key, after which the actual data is symmetrically encrypted. For SMBs, you often don't have to choose this yourself, the software determines it, but it helps to understand the difference when evaluating security solutions.

The biggest pitfall is poor key management. If you lose the decryption key, your data is permanently inaccessible, even to yourself. Therefore, keep keys safe and separate from the encrypted data. A second risk is false security: encryption does not protect against attackers who already have access to a logged-in session or steal the keys themselves via phishing. Outdated encryption algorithms such as DES or MD5 no longer provide adequate protection. Performance degradation can also be a factor: encryption requires computing power, which can be noticeable with very large data volumes or real-time applications. Finally, we often see companies enable encryption but forget to check whether backups, log files or temporary files are also encrypted, which still creates a security breach.

The best first step depends on where you are now with security and AVG compliance. Do you process customer data or payments, but don't know if you have encryption set up properly? Then schedule a free 30-minute security scan with Monkey Vision. We'll walk through your website, hosting and data storage live. You'll immediately get three concrete areas for improvement that you can pick up this week, plus an honest assessment of your risk and compliance status. No sales pitch, just practical advice tailored to your situation. Find out more about our technical development and security services.

About the author

Monkey Vision

Monkey Vision is a full-service digital agency in Remote, specializing in web design, SEO and AI automation for SMEs. The knowledge base is compiled by our team of online strategists and continuously updated based on current insights.

Publication date: 26-04-2026
Last update: 26-04-2026