Disordered photonic structures are promising materials for the realization of physical unclonable functions (PUF), physical objects that can overcome the limitations of conventional digital security methods and that enable cryptographic protocols immune against attacks by future quantum computers. One PUF limitation, so far, has been that their physical configuration is either fixed or can only be permanently modified, and hence allowing only one token per device. We show that it is possible to overcome this limitation by creating a reconfigurable structure made by light-transformable polymers, in which the physical structure of the unclonable function itself can be reversibly reconfigured. We term this novel concept Hyper PUF or HPUF in that it allows a large number of physical unclonable functions to co-exist simultaneously within one and the same device. The physical transformation of the structure is done all-optically in a reversible and spatially controlled fashion. Our novel technology provides a massive enhancement in security generating more complex keys containing a larger amount of information. At the same time, it allows for new applications, for example serving multiple clients on a single encryption device and the practical implementation of quantum secure authentication of data.
翻译:光学障碍结构是实现物理上无法调整的功能(PUF)的有希望的材料,这些物理物体可以克服常规数字安全方法的限制,并能够使加密协议免受未来量子计算机的攻击。迄今为止,一个PUF的限制是,其物理配置不是固定的,就是只能永久地修改,因此每个设备只允许一个标志。我们表明,通过创建由光转换聚合物制造的可重新配置的结构,可以克服这一限制,在这个结构中,无法调整的功能本身的物理结构可以进行可逆转的重新配置。我们使用这个新颖的概念,就是说,它允许大量物理上无法调动的功能同时在同一装置内同时存在。结构的物理转换是完全以可逆和空间控制的方式进行的。我们的新技术在生成包含更多信息的更复杂的密钥方面提供了巨大的增强。与此同时,它允许新的应用,例如为单一加密装置上的多个客户提供服务,并实际执行数据衡算的安全认证。</s>