The MI9 Code for Captured and Detained Personnel
The MI9 Code originated in WW-II and a version of this code is still taught in SERE, allowing captured and detained personnel to transmit a hidden message in otherwise ordinary and mundane correspondence. First, you are going to need the letter writer’s secret number which in this example is 1. (This number is per-arranged, and listed in the EPA.) Then, you need to find the keyword in the encrypted letter which will give you the positions of the words that comprise the hidden message. Find the keyword Count the characters of the first two words of the letter and add the number of the letter writer. In the example embedded below, the first words are ‘I’m afraid’, hence 8 characters. We add 1 (the letter writer’s secret number), 8+1=9. The ninth word, in this case ‘keenly’, is our keyword! Find the codeword frequency Convert the keyword into numbers based on the letters’ position in the alphabet and eliminate numbers 1 to 3. In the example, K=11, E=5, E=5, N=14, L=12, Y=25, so KEENLY t...