The plaintext has been ASCII encoded, the encryption itself was done using a blocklength of 2, e.g.:
plaintext: AB
ASCII values (HEX): 41 42
to be encrypted value: (0x41
Hallo,
ein PRIMa Rätsel. 
Gruß
Oliver
The plaintext has been ASCII encoded, the encryption itself was done using a blocklength of 2, e.g.:
plaintext: AB
ASCII values (HEX): 41 42
to be encrypted value: (0x41
Hallo,
ein PRIMa Rätsel.
Gruß
Oliver