Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

16b8d403d8aee808ef55a48e93c518b743716cb9830b4b97896875b6806faf63328ba3c62268809a0f4d699a51129f72daf7e5b351990e5e058a7e71bec391fa

Ciphertext (hexencoded):

16b8d403d8aee808ef55a48e93c518b7 43716cb9830b4b97896875b6806faf63 328ba3c62268809a0f4d699a51129f72 daf7e5b351990e5e058a7e71bec391fa

Plaintext (hexencoded):

16b8d403d8aee808ef55a48e93c518b7 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x16\xb8\xd4\x03\xd8\xae\xe8\x08\xefU\xa4\x8e\x93\xc5\x18\xb7 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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