This Question is an example of Extended Ceaser cipher( Shift cipher ) , the original Ceaser cipher had key 3 but extended Ceaser can have any Unknown key.
Lets Start . Decrypt the below link , Solve the mystery and go on.
nuf.xk/eturfoubtqdbmdf2
Answer will be Found after three Rounds , and will be Numeric .
Assumptions Shift only applies to alphabets . Numbers Stays Same
Example
Plain text = "abc123"
Key=2
Cipher text = "cde123"
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round 1 view source or inspect element on the blog, and you will find the second round
round 2 first 7 fibonacci number is : 11235813 and document link to lower : 1jz2dw6toiftzgic0-xl4sw3ulo61uzzdy5ipdb2qz1m link : bit.ly/112358131jz2dw6toiftzgic0-xl4sw3ulo61uzzdy5ipdb2qz1m
round 3 read the binary as ascii and you will find the answer