Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9d7adeebc1ca782bc5fe83f7107eb530cb8167cd810b145bc1cdb906804c30a6c834b689ba5b214cbed6f54ef7ac35c725fa46a203b0ce6532d89c75eb47c66f

Ciphertext (hexencoded):

9d7adeebc1ca782bc5fe83f7107eb530 cb8167cd810b145bc1cdb906804c30a6 c834b689ba5b214cbed6f54ef7ac35c7 25fa46a203b0ce6532d89c75eb47c66f

Plaintext (hexencoded):

9d7adeebc1ca782bc5fe83f7107eb530 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9dz\xde\xeb\xc1\xcax+\xc5\xfe\x83\xf7\x10~\xb50 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

{"username": "guest", "is_guest": true}