Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

61b63d6a1c2bd1f09d3e1accd3ae062d1a8aedfa3e945d2d1e6aff7d4997f8c474a0704aa69ded73449a21495887504ad74f26b2525a02e84504c2c3be09ff2c

Ciphertext (hexencoded):

61b63d6a1c2bd1f09d3e1accd3ae062d 1a8aedfa3e945d2d1e6aff7d4997f8c4 74a0704aa69ded73449a21495887504a d74f26b2525a02e84504c2c3be09ff2c

Plaintext (hexencoded):

61b63d6a1c2bd1f09d3e1accd3ae062d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

a\xb6=j\x1c+\xd1\xf0\x9d>\x1a\xcc\xd3\xae\x06- {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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