Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d473241532f40389931fdfb8a71ec1f9a151204d3cc11340243137ddf982c5ecb61679902b2616950660fe71ba393db4ac1f421510440db1e25ebbe609c9a267

Ciphertext (hexencoded):

d473241532f40389931fdfb8a71ec1f9 a151204d3cc11340243137ddf982c5ec b61679902b2616950660fe71ba393db4 ac1f421510440db1e25ebbe609c9a267

Plaintext (hexencoded):

d473241532f40389931fdfb8a71ec1f9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd4s$\x152\xf4\x03\x89\x93\x1f\xdf\xb8\xa7\x1e\xc1\xf9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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