Cash remains a cornerstone of financial systems worldwide, even as the use of digital payments increases. Yet the demands on physical currency have never been higher. Central banks face constant pressure to secure banknotes against sophisticated counterfeiting attempts while meeting growing expectations for sustainability and durability.

“As digital technologies evolve, so do the tools available to counterfeiters,” says Clemens Berger, Chairman of the Board of Managing Directors at Louisenthal. “Central banks must stay ahead of these threats while addressing environmental concerns across the entire cash lifecycle - a challenge that requires innovative approaches to currency design.”

Clemens Berger, Chairman of the Board of Managing Directors at Louisenthal

Rethinking modern banknote design

With access to technologies like high-resolution printing, advanced imaging, and digital tools, modern fraudsters can produce counterfeit banknotes that would have been unimaginable decades ago. For central banks, the consequences of allowing such notes into circulation are devastating on both an economic level and in terms of undermining public confidence in the financial system.  

Central banks have had to rethink modern banknote design to counter this threat, combining top-tier security with features that are easy to check at the point of sale. The public must be able to verify authenticity at a glance, even in poor light, while automated systems (ATMs, counting and processing machines) need to authenticate banknotes instantly and at scale. 

In the past, security was enhanced by layering additional materials, such as holographic foils and polymer patches, onto banknotes. Although effective against counterfeiting, this approach isn’t compatible with the pressures of our more eco-conscious society. Each new security layer adds material weight and energy consumption across the banknote’s lifecycle – from raw material sourcing to end-of-life disposal. The question is how to balance the needs of the environment while keeping banknotes secure and cost-efficient to produce? New technologies are proving that these goals need not be mutually exclusive: 

Technologies that redefine banknote security

Here are four innovations from Louisenthal setting new standards for how central banks can balance these needs: 

1. Micromirror technology: Up to 10 million microscopic mirrors/cm² embedded in security threads deliver more than 90% light reflection for high brightness and clarity, easy to check even in poor lighting. Combined with ColorShift™, it is extremely difficult to replicate convincingly.

2. Nanotechnology applications: Nanotech enables security features at even smaller scales. Used with micromirrors, it delivers precise dual coloring, dynamic visual effects which strengthens security while supporting strong design impact.

RollingStar® Venus Security Thread

3. Intelligent banknote processing: Machine-readable magnetic features in security threads, paired with advanced sensors, enable processing speeds of 40 banknotes/second with high counterfeit-detection accuracy. MultiCode™ can detect microscopic deviations in authentic magnetic patterns, reducing false rejections, extending banknote life, and improving cash-cycle efficiency. 

4. Green banknotes:Hybrid™ substrate technologies can cut carbon footprint by 29% and plastic content by 86% versus traditional polymer alternatives, while maintaining comparable durability. They can incorporate cotton combers (short textile fibers otherwise discarded), supporting circular-economy goals without compromising quality. 

Front and back of the green banknote

The Green Banknote™

These are just some of the technologies that show how central banks can achieve superior security while advancing sustainability goals. However, implementation requirements vary significantly between regions based on climate, infrastructure, and economic contexts.

Security solutions for every need

Although no universal solution exists for diverse global markets, Louisenthal's  Security+ approach enables central banks to access a suite of modular solutions that address their specific regional requirements and give them access to world-class expertise in security innovation. This approach removes all the complexity of designing secure and sustainable banknotes, enabling central banks to focus on what matters most: maintaining trust in their currency.

“Central banks don’t have to compromise on banknote design,” says Dr. Stefan Bichlmeier, Head of Product Management at Louisenthal. “Our Security+ approach serves regional needs while delivering the security, durability, and visual appeal that modern currencies require. We invite central banks to explore how these solutions strengthen their currency while advancing their broader institutional goals.”

Security+ allows central banks to select features that align with their country’s unique circumstances, delivering the flexibility to meet specific security requirements while advancing environmental goals and maintaining public trust.