This really is an Issue.

With almost 10 000 kata, having a new idea is hard, undeniably. But not impossible. And this isn't it.

Don't fool yourself. Look at your ratings.

Caesar ciphers have been done to death. There's entirely too many of 'em, and multiple have already been retired, so for every one you find two more have existed at one time.

Save yourself the downvotes, unpublish this kata. Really. Think of something, anything other than a Caesar cipher. ( Well, don't try Fibonacci either :S )

Doesn't it? It is a part of the story... Is it not good excersise and fun?
If I just ask for the key decoding would it be better because more unique?
Is this really an 'Issue'?
Soon there will be no room for new Katas... there will always be something similar.
I mark as 'resolved' as I do not know where the issue is..

It is a bit different...

There're already many katas about Caesar cipher, and the additional step of key decoding doesn't really make it unique.

.

Yey, I've missed that.
Thanks
Fixed

Adding len(alphabet)-1 might be implicit. I achieved the same effect by abusing negative indices.

Reference solution is wrong. Whenever index goes below 0, you should add len(alphabet), not len(alphabet) - 1. Do not manipulate index by hand, use modulo operation.

^ this

Example test 1 test.assert_equals(decode('h7**,Kw,*;6O','ac'), 'Hello World!') clearly contradicts description example 1.

No, it's not fixed. Please, do not resolve issues until you actually fix them.

Thanks.
Fixed.

Reference solution is wrong. Whenever index goes below 0, you should add len(alphabet), not len(alphabet) - 1. Do not manipulate index by hand, use modulo operation.

It's called a Caesar cipher. That will make it a lot easier for you to search for all the kata this is a duplicate of.