Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

993bef9a00334f7061664c6807b73449155c7eb7b4a5e90f722b16724523c9a5de2c8c2db10ebc2b7f3358e45aa5475a1ff7b6a603c0fd6a34fe8f62b2cb471c

Ciphertext (hexencoded):

993bef9a00334f7061664c6807b73449 155c7eb7b4a5e90f722b16724523c9a5 de2c8c2db10ebc2b7f3358e45aa5475a 1ff7b6a603c0fd6a34fe8f62b2cb471c

Plaintext (hexencoded):

993bef9a00334f7061664c6807b73449 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x99;\xef\x9a\x003OpafLh\x07\xb74I {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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