Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f43e41882eba4e33f7eaa173234de9393cba99b917d6b5712645d24b3153eb70c537bba88ce436e800a01400ae290a3b91255ce631fe34858592dfd57aa5deec

Ciphertext (hexencoded):

f43e41882eba4e33f7eaa173234de939 3cba99b917d6b5712645d24b3153eb70 c537bba88ce436e800a01400ae290a3b 91255ce631fe34858592dfd57aa5deec

Plaintext (hexencoded):

f43e41882eba4e33f7eaa173234de939 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf4>A\x88.\xbaN3\xf7\xea\xa1s#M\xe99 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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