The discipline of cryptography offers the means to shield confidential data from outsiders. Due to the emergence of parallel and high performance computers, conventional encryp- tion, whose security frequently depends on unproven computa- tional assumptions, can be easily broken. Quantum cryptography (QKD), it is based on an essential quantum mechanical principle, guarantees complete safety. In this paper, a web-based simulation for determining the presence of eavesdroppers in a quantum channel utilizing the Ekert91 protocol is designed using the Quantum Information Toolkit (QIT).