Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

90ed3fe772f3e8b663518bd082f5557f404eab086c0b474e54514b28bef70bfe3a389532b1c152a1b294a786509987ddaa513f02415f4c6cea2d698da9d86c23

Ciphertext (hexencoded):

90ed3fe772f3e8b663518bd082f5557f 404eab086c0b474e54514b28bef70bfe 3a389532b1c152a1b294a786509987dd aa513f02415f4c6cea2d698da9d86c23

Plaintext (hexencoded):

90ed3fe772f3e8b663518bd082f5557f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x90\xed?\xe7r\xf3\xe8\xb6cQ\x8b\xd0\x82\xf5U\x7f {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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