Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3149e64999f96a3cb64b1d3bda9a02fc5b84aa7cf3d282be6d6b681a15e0e9d9f503e940f55f061935082c90802002dd8768e421b079c71712cd3f07e728db65

Ciphertext (hexencoded):

3149e64999f96a3cb64b1d3bda9a02fc 5b84aa7cf3d282be6d6b681a15e0e9d9 f503e940f55f061935082c90802002dd 8768e421b079c71712cd3f07e728db65

Plaintext (hexencoded):

3149e64999f96a3cb64b1d3bda9a02fc 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

1I\xe6I\x99\xf9j<\xb6K\x1d;\xda\x9a\x02\xfc {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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