我开发的基于频率的密文解密程序。

简介：
This program represents a self-developed cipher decryption system based on frequency analysis. The system utilizes three primary files: source.txt, which contains the original, unencrypted text obtained directly from the router; target.txt, holding the encoded text; and result.txt, representing the text intended for decoding. The core task involves establishing a character-to-character mapping table. Specifically, a defined correspondence was created, such as A being mapped to ‘s’, and B mapped to ‘Z’, and so on. This mapping table is then applied to transform the content of target.txt into an encoded form, while source.txt serves as the foundational reference corpus – the unaltered plain text against which the encoding process is measured. The objective is to identify this precise mapping table and subsequently decode the contents of result.txt, delivering the recovered text via email to gaga.zhn@gmail.com. Important considerations include: i) The character mapping adheres to a bijective principle (a one-to-one relationship), ensuring each character in the source text has a unique counterpart in the encoded text and vice versa; ii) Numerical digits and other non-alphabetic characters remain unchanged throughout the encoding and decoding procedures. Furthermore, for those who demonstrate exceptional proficiency, a bonus incentive is offered: individuals who successfully transmit both accurate decoded text alongside their own custom-designed program will be rewarded with a special gift. It’s crucial to note that this endeavor is conducted independently – it is not a collaborative group project.