The strength of cryptographic techniques depend on the security of keys and on the strength of encryption algorithms. In symmetric key encryption, two communicating parties share a secret key that should not be known to others. Furthermore, frequent key changes are needed to avoid the attackers from learning the key. Most of the networks are now connected to the Internet and all the information, including exchange of keys, flow through it. Therefore, key distribution is one of the major challenges in communication and network security. This problem becomes more complex when the systems have certain constraints like limited computation power, low bandwidth etc. This paper presents an efficient key distribution scheme for critical infrastructure such as SCADA (Supervisory Control and Data Acquisition) running on constraint environment.

加密技术的强度取决于密钥的安全性和加密算法的强度。在对称密钥加密中，两个通信方共享一个他人不应该知道的秘密密钥。此外，需要频繁更改密钥，以避免攻击者学习密钥。现在，大多数网络都已连接到Internet，并且所有信息（包括密钥交换）都通过Internet流动。因此，密钥分发是通信和网络安全中的主要挑战之一。当系统具有某些限制（例如，有限的计算能力，低带宽等）时，此问题将变得更加复杂。本文提出了一种用于关键基础架构（例如，在约束环境中运行的SCADA（监控和数据采集））的有效密钥分发方案。