Information Security: What It Is, Pillars, Risks, and Good Practices

Understand what information security is, its pillars, main risks, relationship with LGPD, and good practices for protecting data, systems, and operations.

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Information security is one of the central topics of modern digital life.

Companies, professionals, and individuals increasingly depend on data, systems, networks, cloud services, connected devices, cameras, access control, corporate applications, and digital platforms.

The greater this dependence, the greater the need to protect information against unauthorized access, loss, alteration, exposure, or unavailability.

That is why understanding information security is not only a concern for IT professionals. It is a necessity for any organization that depends on data to operate, serve customers, make decisions, and maintain trust.

In this article, we explain the pillars of information security, its main risks, its relationship with LGPD and data protection, security culture, information-security policy, and good practices for connected environments.

What is information security?

Information security is the set of practices, processes, policies, technologies, and controls used to protect information.

This information may exist in digital systems, physical documents, emails, databases, images, access logs, contracts, projects, reports, mobile devices, servers, cloud services, or corporate platforms.

The objective is to reduce risks related to unauthorized access, unauthorized modification, loss, data leakage, unavailability, and improper use of information.

In practice, information security is not limited to installing tools. It involves people, processes, governance, infrastructure, and organizational culture.

A company may have good systems and still remain vulnerable if access is poorly managed, data is shared without criteria, or there is no clear procedure for sensitive decisions.

The three pillars: confidentiality, integrity, and availability

Information security is commonly explained through three pillars: confidentiality, integrity, and availability.

Confidentiality means ensuring that information is accessed only by authorized people, systems, or processes.

Integrity means preserving information as correct, complete, and reliable, preventing improper changes or loss of accuracy.

Availability means ensuring that information is accessible when needed.

These three pillars help explain different types of risk.

A data breach compromises confidentiality. An improper change to a record compromises integrity. A failure that prevents access to a critical system compromises availability.

In real environments, these pillars are interconnected. An access problem may affect operations, trust, compliance, and business continuity.

Information security is not only digital security

Digital security is an important part of information security, but it is not the whole concept.

Digital security focuses mainly on protecting systems, networks, devices, applications, credentials, and online environments.

Information security is broader. It also covers documents, processes, people, physical files, contracts, images, records, internal policies, and organizational decisions.

Data may leak because of a technical failure, but it may also be exposed through improper printing, sending to the wrong recipient, informal conversation, improper disposal, excessive permissions, or lack of procedure.

For this reason, information security needs to be treated as management, not merely as technology.

Main risks to information and data

Information-security risks can appear in many forms.

Some are technical. Others are human, procedural, or organizational.

Common risks include:

• leakage of personal or corporate data;
• weak or reused passwords;
• phishing and social engineering;
• excessive permissions;
• lack of access control;
• backup failures;
• outdated devices;
• improper file sharing;
• absence of an information-security policy;
• improper use of cloud services;
• lack of organized incident response;
• poor integration between physical and digital security.

The central point is that information must be protected throughout its lifecycle: collection, use, storage, sharing, retention, and disposal.

LGPD and data protection: what is the relationship?

Brazil’s LGPD increased attention to the processing of personal data.

It does not replace information security, but it reinforces the need for controls, procedures, and accountability in the use of personal data.

Data such as name, CPF, phone number, email, address, image, biometrics, access records, and financial information need to be processed with purpose, necessity, security, and transparency.

This means data protection is not only a legal obligation. It is also a technical and organizational practice.

Companies need to know which data they collect, why they collect it, who accesses it, where it is stored, how long it is retained, and how it is protected.

In environments involving images, biometrics, and facial recognition, this care is even more important. For further reading, see Biometrics and Facial Recognition: risks, LGPD, and good practices.

Information-security policy: why is it necessary?

An information-security policy guides how an organization should protect its data, systems, access, devices, and processes.

It should turn security principles into understandable rules for daily operations.

A good policy may address topics such as:

• creation and removal of users;
• password use and two-factor authentication;
• permission control;
• use of corporate and personal devices;
• remote access;
• file sharing;
• email use;
• processing of personal data;
• incident response;
• supplier contracting;
• information storage and disposal.

But the policy cannot be merely a formal document.

It needs to be communicated, trained, reviewed, and applied. Otherwise, it becomes a file that exists but does not guide decisions.

Security culture: when rules become behavior

Security culture is what takes security out of the document and into everyday routine.

It appears when people know how to identify risks, know the correct channels, understand which information requires care, and feel authorized to verify before acting.

A mature security culture does not automatically blame the user. It creates conditions that make safe decisions easier.

This involves clear communication, training, leadership, simple processes, practical examples, and recurring reinforcement.

In companies, security culture reduces risks related to phishing, social engineering, data leakage, improper sharing, and informal approvals.

For further reading on this point in the corporate environment, see Social Engineering in the corporate environment.

Phishing, social engineering, and the human factor

Many incidents begin with a human decision: clicking a link, opening an attachment, sharing a code, granting access, or responding to a fake request.

That is why phishing and social engineering are important topics within information security.

Phishing tries to deceive users into providing data, credentials, or unsafe actions. Social engineering exploits trust, urgency, authority, and lack of verification.

These risks should not be treated merely as individual failures. They also reveal weaknesses in processes, training, and culture.

For a practical explanation of phishing, see Phishing: what it is, how to identify it, and why it still works.

Also see the content on social engineering, digital risks, phishing, and information security.

Access control: who can access what?

Access control is one of the most important elements of information security.

It defines who can access a given dataset, system, physical environment, or technical resource.

The basic principle is simple: each person should have only the access necessary to perform their role.

In practice, this requires:

• definition of access profiles;
• formal approval for sensitive permissions;
• periodic review of users;
• rapid removal of unnecessary access;
• control of third parties and suppliers;
• logging of critical access;
• integration between physical and digital access.

Access control also connects to electronic security. Badges, biometrics, entry control, cameras, and digital systems need to be designed in an integrated way.

To understand risks in this convergence, see how to prevent physical-security systems from becoming entry points for cyberattacks.

Information-security risk management

Risk management helps prioritize what should be protected first.

Not all information has the same level of sensitivity. Not every system has the same operational impact.

An organization needs to identify assets, critical data, essential systems, sensitive access, technical dependencies, and processes that cannot stop.

It should then assess threats, vulnerabilities, probability, impact, and existing controls.

Some questions help:

• which data is most sensitive?
• which systems are critical?
• who has access to important information?
• how is that access approved?
• is there a reliable backup?
• is there an incident plan?
• is physical security integrated with networks and cloud?

Risk management does not eliminate every problem, but it helps organizations make more rational and proportionate decisions.

Information security in cloud, networks, and connected systems

Information security also depends on the infrastructure that supports digital services.

Poorly organized networks, outdated devices, uncontrolled remote access, poorly configured cloud services, and undocumented connected systems can increase risk.

Cloud computing, for example, may provide advanced capabilities, but it requires configuration, access control, permission management, backup, and governance.

To understand the infrastructure behind these services, see Cloud computing in practice.

Networks also play an essential role. Instability, poor segmentation, bottlenecks, or lack of control can affect performance and security. For further reading, see Types of Computer Networks and Computer Network Performance.

Information-security governance

Information-security governance defines responsibilities, criteria, and monitoring mechanisms.

Without governance, important decisions become scattered: who approves access, who responds to incidents, who reviews permissions, who updates policies, who assesses suppliers, and who monitors risk.

Good governance organizes roles, processes, indicators, audits, reviews, and accountability.

References such as ISO 27001 help structure information-security management systems, but maturity depends on practical application within the organization’s context.

Governance is not bureaucracy when it helps reduce improvisation and makes decisions more verifiable.

Good practices for strengthening information security

Some good practices help strengthen information security in different types of organizations:

• map data, systems, and critical assets;
• define an information-security policy;
• create access-control criteria;
• use two-factor authentication;
• review permissions periodically;
• train teams against phishing and social engineering;
• maintain tested backups;
• document critical processes;
• define an incident-response plan;
• protect personal data in accordance with LGPD;
• assess suppliers and third parties;
• keep networks, systems, and devices updated;
• integrate physical and digital security;
• perform periodic audits and assessments.

Security improves when it stops being a one-off action and becomes part of the management cycle.

The role of engineering in safer environments

Information security does not depend only on software.

It also depends on infrastructure, power, networks, access control, cameras, servers, cloud systems, documentation, commissioning, and maintenance.

In connected environments, engineering helps turn controls into verifiable solutions.

This means designing correctly, integrating systems, testing deliveries, documenting configurations, reviewing access, assessing risks, and keeping infrastructure operating reliably.

When physical security, digital security, and operations work together, the organization reduces risk and improves its ability to respond to incidents.

Ultimately, information security is a combination of technology, processes, people, and engineering.