Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

a37c9c2aa7e0f02ec8d985d75502f6f4d42a12b3852d707c686ee73fb075649b556437aef001f1c2b6e4e5c97da96f96a84d65dbb6f17d875ca77786e0c1900f

Ciphertext (hexencoded):

a37c9c2aa7e0f02ec8d985d75502f6f4 d42a12b3852d707c686ee73fb075649b 556437aef001f1c2b6e4e5c97da96f96 a84d65dbb6f17d875ca77786e0c1900f

Plaintext (hexencoded):

a37c9c2aa7e0f02ec8d985d75502f6f4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa3|\x9c*\xa7\xe0\xf0.\xc8\xd9\x85\xd7U\x02\xf6\xf4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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