Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

6cf5bcb5ae876ec1f09ede9024554f0e2b968241b86cb42feab59bf97fd20a8dc7d728b7234e8276ec14850644822f2ce1d329313d67b031e01581c8ff2da223

Ciphertext (hexencoded):

6cf5bcb5ae876ec1f09ede9024554f0e 2b968241b86cb42feab59bf97fd20a8d c7d728b7234e8276ec14850644822f2c e1d329313d67b031e01581c8ff2da223

Plaintext (hexencoded):

6cf5bcb5ae876ec1f09ede9024554f0e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

l\xf5\xbc\xb5\xae\x87n\xc1\xf0\x9e\xde\x90$UO\x0e {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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