One of the issues in teaching information security in particular cryptography is lack of tools to facilitate students' understanding of related topics. The study specifically discusses the development of a web based learning tool for teaching symmetric cryptography in Indonesian language. The module is called NgeXTEA which contains a guide to the process of encryption and decryption in stages using Extended Tiny Encryption Algorithm (XTEA). The development of NgeXTEA including its features is presented. Based on several evaluations with various combinations of characters, it is finally concluded that NgeXTEA module works well as expected.