Integration with NÚCLEA systems is a requirement for financial institutions, fintechs, acquirers, and payment service providers that need to operate securely, in compliance with regulations, and with high availability. 

For this integration to be successful, it is necessary to comply with the technical standards of the National Financial System (SFN), implement encryption and digital signatures, protect cryptographic keys, and ensure performance for critical operations.

Digital transformation has accelerated the evolution of the Brazilian financial market and made integrations with regulated ecosystems increasingly strategic. In this context, NÚCLEA plays a key role by providing the infrastructure for various services that are essential to the functioning of the National Financial System.

However, integrating with NÚCLEA’s systems goes far beyond simply exchanging messages between applications. It is necessary to meet strict requirements for security, encryption, authentication, availability, governance, and regulatory compliance. Furthermore, any downtime or failure can compromise critical operations and result in financial consequences.

In this article, you’ll learn about the main challenges of integrating with the NÚCLEA system, the technical requirements that must be met, and how PRODIST helps institutions accelerate this process safely.

What is NÚCLEA, and why is it important to the financial market?

NÚCLEA is one of the key infrastructure providers of the National Financial System (SFN), responsible for operating essential services for financial institutions, payment companies, and other participants in the financial ecosystem.

Over the years, the company has expanded its operations and today offers solutions that support a variety of critical operations, including:

• Recording of assets and receivables;
• Financial settlement;
• Portability;
• Compensation systems;
• Payment infrastructure;
• Secure information sharing.

Its work helps to enhance security, efficiency, and interoperability among institutions participating in the Brazilian financial market.

For banks, fintech companies, credit unions, acquirers, and sub-acquirers, integrating with NÚCLEA’s systems means gaining access to a well-established infrastructure that complies with the Central Bank’s requirements.

Which companies need to integrate with NÚCLEA systems?

Whenever an organization needs to participate in processes regulated by the National Financial System, integration with NÚCLEA’s systems becomes part of the operation’s technological architecture.

As such, the integration with NÚCLEA serves a variety of financial market participants, such as:

• Banks;
• Fintechs;
• Credit unions;
• Payment institutions;
• Buyers;
• Sub-purchasers;
• Software companies that develop solutions for financial institutions.

What are the main requirements for integration with NÚCLEA?

Integration requires the simultaneous fulfillment of technical, operational, and regulatory requirements, namely:

Cryptographic Security

All communications conducted under the SFN protocol must ensure:

• Message encryption;
• Digital signature;
• Authentication between the parties;
• Data integrity;
• Confidentiality of Information.

These mechanisms ensure that only authorized participants can access the streamed content.

Cryptographic Key Management

In addition to encryption, it is essential to protect the entire lifecycle of the keys used in operations.

This involves:

• Safe generation;
• Secure storage;
• Access control;
• Periodic rotation;
• Audit;
• Integration with HSMs or Vaults.

Inadequate key management can compromise the overall security of the operation.

Compliance with Central Bank regulations

Institutions must also ensure that their environments comply with the regulatory requirements applicable to the National Financial System.

Depending on the transaction, this includes requirements related to BCB Resolutions Nos. 494, 495, 496, 497, and 498, as well as the technical standards required for secure communication among participants in the financial ecosystem.

System Certification

Before going live, the systems undergo approval processes to validate:

• Message structure;
• Digital signature;
• Cryptography;
• Communication among participants;
• Business Rules.

This process ensures that integrations take place in a secure and standardized manner.

The Main Challenges of Integrating with NÚCLEA Systems

Although technically feasible, integration often presents significant challenges.

Complexity of Protocols

The protocols used in the SFN have specific rules for message packaging, digital signatures, encryption, and validation.

This requires specialized technical knowledge.

Constant Evolution of Standards

The regulatory environment is dynamic.

Changes implemented by the Central Bank and by NÚCLEA itself require continuous updates to applications to maintain compliance.

High availability

Most operations take place in critical environments.

Outages can disrupt financial settlements, record-keeping, and other essential processes.

Therefore, solutions must offer high availability and contingency mechanisms.

Information Security

The messages contain highly sensitive data.

The protection of this information depends on the correct implementation of cryptographic mechanisms and the proper management of the credentials used by the applications.

Opportunities Created by the Integration with NÚCLEA

Despite its technical complexity, integration offers significant strategic benefits, including:

• Role in regulated ecosystems;
• Greater safety in operations;
• Reduction of operational risks;
• Standardization of communications;
• Operational scalability;
• Greater reliability in processes;
• Support for innovation in financial products.

For fintech companies and growing institutions, this integration also represents a key competitive advantage.

How PRODIST STS Simplifies Integration with NÚCLEA Systems

PRODIST developed PRODIST STS to serve organizations that need to quickly implement secure integrations with the BACEN and NÚCLEA systems.

The solution incorporates the security mechanisms required by the SFN protocol, reducing the complexity of integration projects.

Secure message encapsulation

The institution's application sends the data to PRODIST STS. The platform then automatically performs the following:

• Cryptography;
• Digital signature;
• Generating the security header;
• Packaging in accordance with the SFN protocol.

The packet is routed to its destination using the communication infrastructure defined by the institution.

Upon receipt, PRODIST STS performs the following:

• Opening the package;
• Decryption;
• Digital signature validation;
• Verification of the message's authenticity.

The entire process is automated and secure.

Centralized management of cryptographic keys

PRODIST STS also manages the keys used during the packaging and unpackaging of messages.

Among the available features are:

• Key generation;
• Secure custody;
• Centralized management;
• mTLS authentication;
• Role-Based Access Control (RBAC);
• Remote administration;
• Integration with certified HSMs, enterprise vaults, and cloud-based KMS.

This approach enhances security and reduces risks associated with the manual management of crypto assets.

PRODIST: Expertise in Integration for Critical Financial Environments

Founded in 1987, PRODIST specializes in developing encryption, digital signature, and security solutions for institutions operating in critical financial environments.

Its technology supports operations that require high availability, performance, and regulatory compliance.

Among its unique features are:

• 39 years of experience in the Brazilian market;
• Solutions that have been in use since the inception of the Brazilian Payment System (SPB);
• More than 40 financial institutions served;
• SLA of up to 99.96%;
• Specialized technical support;
• Customer service options that may include 24/7 support;
• Support from the architectural design phase through to production operations.

If your institution is looking for secure integration with NÚCLEA’s systems, working with an experienced partner reduces risks, speeds up implementation, and ensures that your operations are ready to keep pace with the evolving demands of the financial market!

FAQ – Integration with the NÚCLEA System