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+\parindent0pt
+%······································································%
+\input {enigma}
+%%·····································································%
+%% The first machine will be used for encryption of our plain text.
+\defineenigma {encryption}
+\setupenigma {encryption} {
+ other_chars = yes,
+ day_key = B V III II 12 03 01 GI JV KZ WM PU QY AD CN ET FL,
+ rotor_setting = ben,
+}
+%%·····································································%
+%% This second machine below will be used to decrypt the string.
+\defineenigma{decryption}
+\setupenigma{decryption}{
+ other_chars = yes,
+ day_key = B V III II 12 03 01 GI JV KZ WM PU QY AD CN ET FL,
+ rotor_setting = ben,
+}
+%%·····································································%
+%% main
+%%·····································································%
+%% Ciphertext in the PDF. Rely on the addressee to decrypt the document
+%% externally.
+%%·····································································%
+%% encryption of plain text
+%%·····································································%
+\startencryption
+ Never underestimate the amount of money, time, and effort someone will expend to thwart a security system.
+\stopencryption
+
+%%·····································································%
+%% decryption of ciphertext
+%%·····································································%
+%% Input string generated with:
+%% mtxrun --script t-enigma \
+%% --setup="day_key=B V III II 12 03 01 GI JV KZ WM PU QY AD CN ET FL,\
+%% rotor_setting=ben,\
+%% other_chars=yes"\
+%% --text="Never underestimate the amount of money,\
+%% time, and effort someone will expend to\
+%% thwart a security system."
+\startdecryption
+ aqsnwyxgqarpuzrdktscbslaqmdhyonywxkwhcdgphvuqsspfjwhlszahygjbzmfpcpbniahvfcuradntepxsfchnn
+\stopdecryption
+%%·····································································%
+\bye