Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e5dcc876138607d86b2ab437ce885274fc80557867598acfd402d1f178020d3055e0b55fac98e109062f54d9bd901a301d7785864f49097c84e8a77461be5b19

Ciphertext (hexencoded):

e5dcc876138607d86b2ab437ce885274 fc80557867598acfd402d1f178020d30 55e0b55fac98e109062f54d9bd901a30 1d7785864f49097c84e8a77461be5b19

Plaintext (hexencoded):

e5dcc876138607d86b2ab437ce885274 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe5\xdc\xc8v\x13\x86\x07\xd8k*\xb47\xce\x88Rt {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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