For developers, the surge in cloud computing adoption has brought both new opportunities and challenges. On the one hand, developers are turning to cloud services for data storage, processing and accessibility due to their flexibility, convenience and cost-effectiveness. And because the cloud takes care of these infrastructure and operational concerns, it’s allowing developers to focus on coding, innovation and delivering value to end-users. It also allows companies to scale more easily when their market grows or when new hardware becomes available.

However, this paradigm shift has led to the accumulation of vast volumes of sensitive data on remote cloud servers—including personal, health, financial and proprietary business information. As the volume of sensitive data on the cloud continues to grow, it has naturally raised mounting security concerns, from data breaches and cyberattacks, to unauthorised access and the complexities in complying with specific industry regulations, such as GDPR or CCPA.

For some, having to rely on the cloud provider to maintain robust security practices and data protection has also led to hesitancy in sharing data, both within and between organizations. This not only limits the potential for data-driven collaboration, research, and innovation—essentially halting progress in fields like health care, science, and social sciences—but businesses of all types and sizes could miss opportunities for cost savings, scalability, and efficiency if they’re not willing to adopt innovative technologies. There are also cases when companies are forbidden to do something by law because of privacy, again causing roadblocks.

All of this has meant that up until now, maintaining data privacy while making the most of cloud computing has been somewhat of a balancing act for developers and companies. Companies want to fulfill their clients’ needs, while developers have to find technical solutions that provide the level of privacy required.

Traditional Encryption methods Vs. Fully Homomorphic Encryption (FHE)

Currently, there are several technologies and practices employed to protect data in the cloud, one of the most commonly used being traditional data encryption, which provides protection only during data transmission and storage.

However, when data is processed, it must be decrypted—at which point it can expose data to eavesdropping, rendering it susceptible to potential threats. The aim of FHE is to ensure that the computations can be carried out on cloud-based machines while the data itself remains encrypted. With FHE, the data is really encrypted end-to-end: not only is it encrypted during transport and storage, but also it is encrypted during computations. It is only when the data or results are sent back to the client side that they are decrypted.

This means that in the event of a data leak, the exposed information would be rendered meaningless without the decryption key, which stays securely in the hands of the owner. In other words, neither the cloud provider nor any potential spyware on the cloud machine would have the capability to decrypt the encrypted data.

This approach, which ensures sensitive data remains encrypted throughout its entire life cycle on the cloud, even during processing and analysis, significantly enhances data security and privacy.

Current Limitations and FHE’s Future Developments

While developers using traditional cloud services previously had to decide whether to use the cloud with some privacy concerns or forgo its benefits altogether, with FHE we are starting to see a possible shift in attention from users’ reliance on the cloud provider to a more user-controlled approach.

As FHE becomes more widespread, users gain the ability to make their computations over any cloud provider, even those they may not fully trust. This means the upfront costs of building new cloud platforms can be lowered by providing only FHE computation.

While the encryption of data ensures that computations are secure and no unauthorized access or breaches can occur, this new tech is not without its limitations. For the enhanced security FHE offers, there may come a trade-off of longer execution times. Presently, we are mainly reliant on CPUs for computations. However it’s worth noting that as the technology advances and hardware accelerators become available, the execution time is expected to improve in the future. In fact, we anticipate that by 2026, FHE implementations will see a considerable increase in speed, potentially by factors of 100x or 1,000x, expanding the applicability of FHE to a wider range of use cases.

Other benefits currently being worked on include usability. FHE had a reputation of being very complex and so used to be reserved for those with cryptography PhDs. By developing open source tools and extending the community’s knowledge around FHE, the aim is to democratize FHE so that anyone can use it, companies can experiment free of charge and check if it fulfills their needs.

Looking to the future, privacy will likely remain high on the agenda for almost everyone. Thankfully, with new encryption technologies rapidly developing in terms of speed and usability, developers look set to achieve this, ensuring their cloud-based applications and services are as secure as possible.