A dummy encryptation approach.
The idea is pretty simple, an array of random located bytes is generated. Then, those bytes are mapped to their respective index. For example:
random [
4 -> 0
1 -> 1
0 -> 2
2 -> 3
3 -> 4
]
indexes [
0 -> 4
1 -> 1
2 -> 0
3 -> 2
4 -> 4
]
Once you need to encrypt some data, it will look for every byte and start encrypting.
input: 4 3 2 1 0
random [
4 -> 0
1 -> 1
0 -> 2
2 -> 3
3 -> 4
]
output: 0 4 3 1 2
And for decryption it is opposite, it will look up in indexes array.
input: 0 4 3 1 2
indexes [
0 -> 4
1 -> 1
2 -> 0
3 -> 2
4 -> 4
]
output: 4 3 2 1 0
The trick here is that you can create infinite layers of encryption:
Encrypt:
layer 1 input : 4 3 2 1 0
layer 1 output: 0 4 3 1 2
layer 2 input : 0 4 3 1 2 (2nd layer)
layer 2 output: 4 1 2 3 0
(and so on...)
Decrypt:
layer 2 input : 4 1 2 3 0 (2nd layer)
layer 2 out : 0 4 3 1 2
layer 1 input : 0 4 3 1 2
layer 1 output: 4 3 2 1 0
You can run the command dub test to test the project.
That is all. I hope my brain did not mess up something in the examples...