Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

bbcede42912d841c69994e3fe0f0ba3690b3243705107534741e5b7556882b4890ad4bdb1e793bfa8a94f83ff097c52ac8f379aa5cb5967b38946ca1e5ab8b69

Ciphertext (hexencoded):

bbcede42912d841c69994e3fe0f0ba36 90b3243705107534741e5b7556882b48 90ad4bdb1e793bfa8a94f83ff097c52a c8f379aa5cb5967b38946ca1e5ab8b69

Plaintext (hexencoded):

bbcede42912d841c69994e3fe0f0ba36 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbb\xce\xdeB\x91-\x84\x1ci\x99N?\xe0\xf0\xba6 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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