Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e019b0c894586d2c78d39183dc9074fd0bf27206c7f695dd680b6040faf1d562acd1b0c0b7e613b7a27d2b4b02b2601e83db81e86b4c4d845596562641904522

Ciphertext (hexencoded):

e019b0c894586d2c78d39183dc9074fd 0bf27206c7f695dd680b6040faf1d562 acd1b0c0b7e613b7a27d2b4b02b2601e 83db81e86b4c4d845596562641904522

Plaintext (hexencoded):

e019b0c894586d2c78d39183dc9074fd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe0\x19\xb0\xc8\x94Xm,x\xd3\x91\x83\xdc\x90t\xfd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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