dsh-vigenere

In security education and cryptography exercises, we often need a lightweight, offline symmetrical cipher tool that works out of the box. dsh-vigenere fills exactly that niche: it implements the classic Vigenere cipher in pure Node.js, completing the entire encryption and decryption cycle locally with zero network calls—convenient for air-gapped environments and eliminating the risk of sensitive data leaving the machine.

The plugin stays focused on one job. Once installed, it registers a set of Vigenere cipher tools inside a DeepSeek Harness session, so you can simply describe your encryption or decryption need in natural language and get the result. There is no sprawling dependency tree, no additional service process—install and go, with transparent logic that makes it easy to verify classic symmetric-algorithm behavior in teaching demos, script automation, or security audits.

It is best suited for self-taught security learners, cryptography course instructors, and developers who need quick, local text encryption experiments. If you are curious about how classical ciphers work under the hood, or you want to run a full symmetric encrypt-decrypt round-trip in a network-free sandbox, this plugin offers a clean, zero-dependency starting point.