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| -rw-r--r-- | README.md | 21 | ||||
| -rw-r--r-- | card-tiles.jpg | bin | 0 -> 172391 bytes |
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@@ -240,6 +240,27 @@ are ommitted). All of the special characters are mapped to the Hearts, though coming up with a mnemonic for the mapping of each special character to each Heart is left as an exercise for the reader. +For an example, view [this image](card-tiles.jpg). In this example, the marker +is on J♣ (at the top left), and we want to encrypt the plaintext character `e`. + +1. From the card mapping, `e` maps to 5♦ (letters `a` through `m` map to Diamonds), which is on the second row. +1. The marker card, J♣, has: + - an index of 24 (Clubs are suit 1, and the Jack is the 11th card in the suit): `i = 1 * 13 + 11 = 24` + - an x-offset of 3: `x = i % 7 = 24 % 7 = 3` + - a y-offset of 3: `y = i / 7 = 24 / 7 = 3` +1. Using the marker offsets, the ciphertext card is three rows down and three columns to the right of 5♦, which is 6♠. +1. From the card mapping, 6♠ maps to `6` (Spades map directly to digits), and has: + - an index of 45 (Spades are suit 3, and 6 is the 6th card in the suit): `i = 3 * 13 + 6 = 45` + - an x-offset of 3: `x = i % 7 = 45 % 7 = 3` + - a y-offset of 6: `y = i / 7 = 45 / 7 = 6` +1. We then complete the cipher as normal: + - Output `6` as the ciphertext + - Rotate the row containing the plaintext card, 5♦ + - Rotate the column containing the ciphertext card, 6♠ + - Move the marker according to the offsets of the ciphertext card, to the right 3 and down 6 + +The image includes the character, index, and offsets for the relevant cards. + For LC4, the following board could be used: ``` diff --git a/card-tiles.jpg b/card-tiles.jpg Binary files differnew file mode 100644 index 0000000..920a2fc --- /dev/null +++ b/card-tiles.jpg |
