Overthewire Natas Level 11 updated flag

Hi everyone. I am trying to solve Natas 11, but I haven't managed to find the correct flag. I read up on some of the writeups and followed the sample code to generate the cookie, but no idea why the cookie is still wrong. The passwords for the Natas games were updated since last year I think. Anyone has tried to solve it since it was last updated? Thank you.

Here is my attempt (I followed this writeup: https://www.abatchy.com/2016/11/natas-level-11):

Initial cookie: MGw7JCQ5OC04PT8jOSpqdmkgJ25nbCorKCEkIzlscm5oKC4qLSgubjY=

Key: KNHLKNHLKNHLKNHLKNHLKNHLKNHLKNHLKNHLKNHLK

New cookie: MGw7JCQ5OC04PT8jOSpqdmk3LT9pYmouLC0nICQ8anZpbS4qLSguKmk2

submitted by /u/Snoo_489
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from hacking: security in practice https://ift.tt/Yi6jIlL

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