SimpleCrypt: Pocket Tube Cipher

by enrohtkcalb, published

SimpleCrypt: Pocket Tube Cipher by enrohtkcalb Dec 25, 2017
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A very simple character substitution-style encryption tube that is small enough to easily fit in your pocket or bag. There are 3 pre-randomized outer cylinders and inner rods labeled 1 - 3, and they can be used in any of 9 combinations of rod and cylinder. However, there is also a custom set that can be ordered however the user likes.

Optional Supports and Other Printing Must-Knows

I have included files with and without supports, however, since I inserted the supports by hand, they may be insufficient or overly wasteful, you may consider using supports generated by a more refined program.

This model is also very small, and may therefore be too small to print without losing necessary detail. Increasing the scale may preserve said details, but remember that all tolerances will be magnified proportionally, so the parts will fit more loosely.

How-to Guide

Know your code:

Each rod and cylinder have a number labeling them; the rod is labeled on the internal wall while the cylinder is labeled on the inside base. As well, there are notches on the bottom of the rod that allow the rod to rotate and lock in 6 positions, which are denoted by the numbers 1 - 6 on the top of the rod and an arrow on the edge of the cylinder.

By combining these 3 numbers, you have an encryption code, which you can note at the beginning of an encrypted note.

If you use the custom set, be sure to include the full 36 character set for each individual rod and cylinder. Having too few on one, or too many on another may mean it will be possible to substitute multiple characters for the same input (e.g. A -> 2, and, A -> F), so encryption would be lossy.

Get cipherin':

This cypher can be used only 2 ways. The first is to substitute the left character in a pair for the right, and the second is to substitute the right for the left.

This is an example of encryption using rod 1, cylinder 2, and position 3, read left to right

  1. hello world (encrypt test)
  2. 123, 7C66D GDL6Y;
  3. (decrypt test) hello world

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