What kind of decryption is used in this example? I stumbled upon an encrypted text on a website, to which Google had brought me, showing me the plain text also. So does anyone know what kind of encryption was used here and how to decrypt it, so I can decrypt the rest of the text?

Encrypted text:


  Deälldllod Lokl Koih, dg emlll ld kmd Llshlloosdelädhkhoa Lühhoslo ha Melhi hlhmoolslslhlo, dgiill kll shllll Hmomhdmeohll kld M8-Modhmod


Plain text:


  Spätestens Ende Juli, so hatte es das Regierungspräsidium Tübingen im April bekanntgegeben, sollte der vierte Bauabschnitt des A8-Ausbaus 


First it looked to me like a substitution cipher, but there are multiple letters which translate to l. So is this a substitution cipher, where no decryption is possible, or is there an other way?

I look forward to your suggestions.
Well, it seems it is a basic substitution cipher, with a twist: some letters map to the same cipher text letter (not just e,r,t map to l, also e.g. n,u map to o . So decryption is not unique. But a pattern matching algorithm with a German dictionary could probably filter those. The mapping seems to group letters in such a way, that only one combination makes sense.

Anyway, from the example text you can probably find most character mappings, and then you just need to guess words based on valid combinations in a dictionary.

In general, I would not actually call this encryption at all. A scheme like this won't work for just any non-injective mapping, so it's unclear if there is some key involved or not. Also, an encryption scheme requires, that (with overwhelming probability) the decryption is unique and correct, s.t. $D(E(m))=m$.