| 摘要 |
A large user-editable data file ("BED" file) allows customizing of an encryption/decryption computer program and strengthens encryption by making the difference between the input character code at a particular target file position and the corresponding output character code very variable and dependant on, importantly, the input character itself and the user-controlled BED file, in addition to the key and particular target file position. A pseudo-random number, ultimately dependant on the key and target file position, selects a specific BED file page and also is added to the input character code, the sum becoming a positional index into that page, and the value at that index yielding the output character code. A graphical user interface allows editing of each BED file page and temporarily lists missing values and highlights illegal duplicates in color. Colored number value sub-sets allow the state of randomness of each page to be easily seen.
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