What Is Cryptography in Cyber Security: Types, Examples & More

Cryptography in cyber security is one of the most important technologies used to protect sensitive data from unauthorized access. From HTTPS encryption on websites to database encryption in enterprise systems, modern organizations rely heavily on cryptographic methods to safeguard information.

But what exactly is cryptography in cyber security — and how does it work?

At its core, cryptography is the process of converting readable data (plaintext) into an unreadable format (ciphertext) using encryption algorithms and cryptographic keys. Only authorized users with the correct key can decrypt and access the information.

In this guide, we’ll explain:

• The types of cryptography

• Symmetric vs asymmetric cryptography

• How encryption and decryption work

• Real-world examples of cryptography

• The benefits of cryptography in network security

What Is Cryptography in Cyber Security?

Cryptography in cyber security refers to the practice of protecting information by transforming it into a secure format that prevents unauthorized access. It is used to protect data both at rest (stored data) and in transit (data being transmitted across networks).

In computer and network security environments, cryptography ensures:

• Confidentiality of sensitive information

• Integrity of data during transmission

• Authentication of users and systems

• Non-repudiation of digital communications

Without cryptography, modern digital communication — including online banking, email systems, and e-commerce — would not be secure.

Types of Cryptography

There are two primary types of cryptography used in cyber security environments.

Symmetric Cryptography

Symmetric cryptography, also known as secret key cryptography, uses a single shared key for both encryption and decryption.

This means the same key that encrypts the data is also used to decrypt it.

Because it uses only one key, symmetric encryption is:

• Faster

• More efficient for large volumes of data

• Commonly used for local storage encryption

Examples of symmetric encryption algorithms include AES (Advanced Encryption Standard).

Asymmetric Cryptography

Asymmetric cryptography, also known as public key cryptography, uses two separate keys:

• A public key (shared openly)

• A private key (kept secret)

The public key encrypts data, while the private key decrypts it.

Asymmetric cryptography is commonly used in:

• Secure email communication

• Digital signatures

• HTTPS encryption

• Secure key exchanges over public networks

A well-known example of asymmetric encryption is RSA.

Symmetric vs Asymmetric Cryptography

The main difference between symmetric and asymmetric cryptography lies in how keys are used.

In many security systems, both methods are combined to maximize performance and security.

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Encryption and Decryption Explained

Understanding encryption and decryption is essential to understanding cryptography in cyber security.

Encryption

Encryption is the process of converting readable data (plaintext) into an unreadable format (ciphertext) using a mathematical algorithm and a cryptographic key.

For example:

Plaintext → Encryption Algorithm + Key → Ciphertext

Encrypted data appears scrambled and cannot be understood without the correct decryption key.

Encryption is used to protect:

• Emails

• Databases

• Financial records

• Customer information

• Cloud storage

Decryption

Decryption is the reverse process. It converts ciphertext back into readable plaintext using the correct cryptographic key.

Ciphertext → Decryption Algorithm + Key → Plaintext

If an unauthorized user attempts to access encrypted data without the proper key, the data remains unreadable.

Encryption and decryption together form the foundation of modern network security systems.

Examples of Cryptography in Cyber Security

Cryptography has wide-ranging applications across modern IT environments. Below are common real-world examples of cryptography in network security.

HTTPS Encryption

Secure websites use HTTPS encryption to protect communication between users and servers.

When you see “https://” in a website URL, it means data transmitted between your browser and the website is encrypted using SSL/TLS protocols.

HTTPS encryption helps prevent:

• Man-in-the-middle attacks

• DNS spoofing

• Data interception

• Credential theft

For organizations handling customer payments or login credentials, HTTPS encryption is mandatory.

Database Encryption

Database encryption protects sensitive data stored in databases, including:

• Customer records

• Employee PII

• Financial information

• Intellectual property

Transparent Data Encryption (TDE) is commonly used in SQL-based systems to encrypt stored data automatically.

Database encryption ensures that even if attackers gain access to the database files, the data remains unreadable.

Email Encryption

Email encryption secures sensitive communications by ensuring that only intended recipients can read messages.

End-to-end encryption uses public and private keys to protect:

• Attachments

• Internal communications

• Financial data

• Legal documents

This significantly reduces phishing risks and data leaks.

BYOD Device Encryption

Organizations with Bring Your Own Device (BYOD) policies must encrypt employee devices to protect sensitive data.

Device encryption ensures that if a phone or laptop is lost or stolen, stored corporate data remains inaccessible to attackers.

Benefits of Cryptography in Cyber Security

Implementing cryptography offers multiple security advantages.

Confidentiality

Encryption ensures that sensitive information remains confidential, even if intercepted by attackers.

Data Integrity

Cryptographic hashing and encryption prevent unauthorized data modification during transmission.

Authentication

Cryptography verifies user identities through digital signatures and certificates, reducing phishing and impersonation risks.

Non-Repudiation

Cryptographic signatures provide proof that a message was sent and received, reducing legal disputes.

Regulatory Compliance

Many compliance frameworks require encryption controls, including:

• HIPAA

• PCI DSS

• NIST frameworks

• ISO standards

Implementing strong encryption supports regulatory alignment and audit readiness.

How RSI Security Helps You Implement Cryptography

Cryptography in cyber security is not a one-size-fits-all solution. Organizations must align encryption methods with their infrastructure, risk profile, and compliance obligations.

RSI Security helps organizations implement and manage cryptographic controls, including:

• Local and remote disk encryption

• Endpoint encryption management

• Database encryption implementation

• HTTPS configuration and validation

• Cryptography tool patch management

• Penetration testing of encryption controls

• Monitoring encrypted file storage integrity

As an experienced managed security services provider (MSSP), RSI Security ensures your encryption tools integrate seamlessly into your broader cybersecurity framework.

To strengthen your cryptographic controls and protect sensitive data, Contact RSI Security today.

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