We lost the ability to show the error message for duplicate chars in key.

AABCD

The previous string is detected as duplicate, however the following:

ABCAD

Is not which is the issue.

Add ability to generate dual key given the original key.

Rationale

This is useful for encrypting and then decrypting the message. The same key cannot be applied, the inverse replacement key must be used instead.

At the moment we always log. However students might want to do that too in their functions, if they do they would get a polluted log.

It is not possible to paste a key. This makes it difficult to test more than in real scenarios.

Test scenarios mitigation

Use F12 tools and invoke:

decryptCypherText("Plain text or cypher text", "key")

Prepare placeholders for code in release mode.

The function for removing spaces and newlines actually does not work. Verified with spaces.

At the moment we are checking duplicates. We must check that only letters are inserted.

When applying the key, we strip spaces and newlines. We should keep them maybe.

I've got a baaaad feeling about this:

https://github.com/andry-tino/ws-crypto-histo/blob/master/output/HOWTO.md#function-getnumberofoccurrencesforletter

As for #6 targeting the input box, we need to apply the same for the key input

One story is complete, we need 3 more stories, 1 per group of students. Use characters from The Hunger Games saga.

When copy pasting text from other sources in the input box, formatting ends up being pasted too. We need to properly strip formatting so that only plain text is pasted.

This is as a result of applying space and newline stripping right on input.

Suggested fix

Apply a 3 second delay like in input box.