Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

bdb2835e76ee30b436b02a9ef7de37019285587efe4d43cd3bfc23b957562ff5a65166b73ffd1141cbf50986cbe9317b806d409727e32b60dddf4fbc3941d377

Ciphertext (hexencoded):

bdb2835e76ee30b436b02a9ef7de3701 9285587efe4d43cd3bfc23b957562ff5 a65166b73ffd1141cbf50986cbe9317b 806d409727e32b60dddf4fbc3941d377

Plaintext (hexencoded):

bdb2835e76ee30b436b02a9ef7de3701 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xbd\xb2\x83^v\xee0\xb46\xb0*\x9e\xf7\xde7\x01 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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