Create an implementation of the rotational cipher, also sometimes called the Caesar cipher.
The Caesar cipher is a simple shift cipher that relies on
transposing all the letters in the alphabet using an integer key
between 0 and 26. Using a key of 0 or 26 will always yield
the same output due to modular arithmetic. The letter is shifted
for as many values as the value of the key.
The general notation for rotational ciphers is ROT + <key>.
The most commonly used rotational cipher is ROT13.
A ROT13 on the Latin alphabet would be as follows:
Plain: abcdefghijklmnopqrstuvwxyz
Cipher: nopqrstuvwxyzabcdefghijklm
It is stronger than the Atbash cipher because it has 27 possible keys, and 25 usable keys.
Ciphertext is written out in the same formatting as the input including spaces and punctuation.
- ROT5
omggivestrl - ROT0
cgivesc - ROT26
CoolgivesCool - ROT13
The quick brown fox jumps over the lazy dog.givesGur dhvpx oebja sbk whzcf bire gur ynml qbt. - ROT13
Gur dhvpx oebja sbk whzcf bire gur ynml qbt.givesThe quick brown fox jumps over the lazy dog.
To run the tests, run the command dotnet test from within the exercise directory.
Initially, only the first test will be enabled. This is to encourage you to solve the exercise one step at a time.
Once you get the first test passing, remove the Skip property from the next test and work on getting that test passing.
Once none of the tests are skipped and they are all passing, you can submit your solution
using exercism submit RotationalCipher.cs
For more detailed information about the C# track, including how to get help if you're having trouble, please visit the exercism.io C# language page.