ROT13stä
ROT13stä is a variant of the ROT13 cipher designed for text in the Swedish alphabet, which includes the letters Å, Ä, and Ö in addition to the standard 26 Latin letters. In ROT13stä, each letter is moved 13 positions forward within a 29-letter alphabet, wrapping around at the end. Non-letter characters and punctuation are not altered, and the case of letters is preserved.
Alphabet and mapping are defined as follows: A, B, C, D, E, F, G, H, I, J,
Practical use of ROT13stä is mainly within puzzles, word games, or stylistic text obfuscation where Swedish
Example: the string "ABC" becomes "NOP" under ROT13stä. To revert, "NOP" should be transformed by a 16-step