Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

14629a5a6a8478b173ddea5c790f909b54c8eafd09dffffbf626995dd2f4f50ee481eb87a6651bb165de18b159881e739f7f8fc3b156edc13d7c123d0f5f3cad

Ciphertext (hexencoded):

14629a5a6a8478b173ddea5c790f909b 54c8eafd09dffffbf626995dd2f4f50e e481eb87a6651bb165de18b159881e73 9f7f8fc3b156edc13d7c123d0f5f3cad

Plaintext (hexencoded):

14629a5a6a8478b173ddea5c790f909b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x14b\x9aZj\x84x\xb1s\xdd\xea\\y\x0f\x90\x9b {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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