Nazmath Nazeer from SignQuantum announced that Ueno Bank, Paraguay’s largest financial institution, has deployed its first quantum‑resistant solution, SignQuantum, a software add‑on that applies post‑quantum digital signatures to electronically signed documents. Leveraging SignQuantum’s post‑quantum security and QANplatform’s quantum‑resistant blockchain for immutable time‑stamping, the system now safeguards the integrity and authenticity of documents for the bank’s 2.2 million customers across 70 branches and 1,100 ATMs. By integrating the technology without altering existing e‑signature workflows, Ueno Bank becomes the first bank worldwide to adopt quantum‑resistant cybersecurity, setting a precedent for the Latin American financial sector.
Ueno Bank Leads Quantum Resistant Banking in Paraguay
Ueno Bank, founded in 2021 and operating 70 branches and 1,100 ATMs, serves 2.2 million customers. On 11 September 2025 it announced that it would bring its entire customer base into a quantum‑resistant security environment, becoming the first bank worldwide to deploy the SignQuantum add‑on and the QANplatform quantum‑resistant blockchain. The announcement, made in Asunción, was carried out with the Paraguayan technology firm ITTI as the implementation partner.
SignQuantum, a post‑quantum digital‑signature add‑on from Quantum Software Solutions in Qatar, attaches to existing e‑signature workflows without requiring changes to the bank’s processes. By embedding a quantum‑resistant signature scheme into the metadata of each signed document, it ensures that any alteration would be detectable even if a quantum computer could reverse the cryptographic hash, allowing a fast‑lane transition to quantum‑safe signatures.
QANplatform is a hybrid blockchain that records document hashes using post‑quantum signatures, creating an immutable timestamp that resists tampering by future quantum machines. The platform supports smart contracts, accepts code in any programming language, and is a member of the Linux Foundation. It was among the first twenty organisations to join the Linux Foundation’s Post‑Quantum Cryptography Alliance, and its first deployment in an EU jurisdiction occurred in 2024.
ITTI, Paraguay’s leading technology integrator, holds exclusive Latin‑American distribution rights for SignQuantum and provides software deployment, ongoing security monitoring and compliance support. The company has hubs in Argentina, Brazil and Colombia, won a gold award for Digital Banking for Financial Innovators at Fintech Americas 2025 in Miami, and plans to open offices in Mexico, Chile and Peru by the end of 2025.
The threat that prompted the initiative is the potential for quantum computers to perform “time‑travel” attacks, whereby a malicious actor could backdate and modify the content and signature of a digitally signed document, undermining the trust model that underpins electronic banking. Ueno Bank’s adoption of SignQuantum and QANplatform therefore represents a proactive step to future‑proof its operations and protect customer data from this class of cyber‑risk.
In the words of Ueno Bank’s president, Juan Manuel Gustale, the bank’s move signals a new standard of cybersecurity for the region. SignQuantum’s CEO, Nazmath Nazeer, highlighted the significance of the first bank‑wide quantum‑resistant rollout. The deployment has attracted attention from Latin‑American regulators, who view it as a benchmark for the sector’s readiness to confront post‑quantum cryptography challenges.
By demonstrating that post‑quantum cryptography can be integrated into high‑volume banking environments without disrupting existing workflows, the deployment sets a precedent that could accelerate the adoption of quantum‑safe solutions across the global financial landscape.
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