Can anyone decrypt this string using PHP? [closed]

Question

Today I came across a job ad where you should decrypt a string that holds valid email address using PHP. So they posted this string, that represents crypted email address, and when you decrypt that email address you can send them email and show that you are Senior PHP developer. And they posted another email address for Junior developers.

Now this seems to complicated for me so I wont send them email anyway since I already have a job, but I'm wondering is this even possible since you can't have key if using mcrypt functions.

Anyway, this is the string: MDA3MTY4MDAwODg4MDE0NzIwMDAwMzg4MDAwNDQ0MDAwNTEyMDAwMzg4MDI1NjAwMDA3NDg4MDA3Mjk2MDAzNTUyMDAyOTQ0MDAwODMyMDAzNjQ4IzYzNzIyMzI4NjY1NjM1

Company name is Aduro, and their emails are [email protected], so we are looking for email that ends with @aduro.hr

That string represents valid email address, is anyone good enough to decrypt this?

Answer 1

Not an answer, but some observations:

MDA3MTY4
MDAwODg4
MDE0NzIw
MDAwMzg4
MDAwNDQ0
MDAwNTEy
MDAwMzg4
MDI1NjAw
MDA3NDg4
MDA3Mjk2
MDAzNTUy
MDAyOTQ0
MDAwODMy
MDAzNjQ4
IzYzNzIy
MzI4NjY1
NjM1

Every column containing a digit only contains digits and lowercase letters. Every column containing an upper case letter does not contain any digits.

If it is an e-mail address, then I would tentatively assign IzYzNzIy as the dot character '.' Nothing immediately strikes me as likely to be the '@', possibly the MDI1NjAw because it is the only one starting with MDI. The other non-MDA, MDE0NzIw, is in the correct position for a punctuation character in someone's name: "Smith-Jones" say. That would leave all the MDAs as alphabetic characters. What is happening after the potential dot is anyone's guess. Are there any single letter codes allowed there? NjM1 could be short for <CR><LF>.

Maybe we are looking at four character code elements?

MDA3
MTY4
MDAw
ODg4
MDE0
NzIw
etc.