A Caesar cipher, or a shift cipher, is one of the most well known encryption techniques. It works by substituting the letters in the message with l...
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Here we go:
Without any proper dictionary, I guess I'll stick to the "bruteforce" method! Here's how it works:
[...Array(26)].map((_,i)=>26-i)
)26-n
) and the cipher (s
)I’m learning Erlang and I love it.
My solution for cracking the message tries all keys, performs frequency analysis on each result, and sorts the candidates by closeness to the frequencies of letters in the English language.
To try:
Of course, instead of decrypting the message 25 times, I should perform frequency analysis, shift the keys of the map 25 times, take the three shortest distances and then decrypt the message with the corresponding keys. I’ll update my solution later.
JavaScript
I imagine that for now, the only way to decypher a phrase would be to check each word to verify that it is valid using either a dictionary or an API. Which may be a pain.
A thing that is not going to work now, but maybe it could work in the future (big "maybe" here, but bear with me for a second):
It would be super hacky, but it would allow us to use the browser dictionary (if it's not open already, in which case, we should use it) instead of having our own dictionary or having to call an API.
Unfortunately,
::grammar-error
and::spelling-error
are not currently supported by any browser, so I cannot test this crazy idea at the moment.C#
Rept.it
C++
My solution in js
Ruby
Using English frequency analysis (but you actually need to know the language source), here is a javascript version:
You'll get results sort by entropy score:
JavaScript
ruby <3
My updated Erlang solution.
I now perform frequency analysis on the encrypted message, calculate the correlation with the frequencies of letters in the English language, and use the best N correlation values to decrypt the message.
To try:
Python :
One line :
This is an interesting one. It can be easily solved if you implement first the modulo function in JavaScript.
I have an article about this:
dev.to/codeguppy/javascript-modulo...