Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

04138a607e378d59c4ec2094ea5cc0b472131938c8719be5bb4a8be76154a48198d61de63057e4a12ca18a996c3432ba8cf43028f7373c5179597828af828c24

Ciphertext (hexencoded):

04138a607e378d59c4ec2094ea5cc0b4 72131938c8719be5bb4a8be76154a481 98d61de63057e4a12ca18a996c3432ba 8cf43028f7373c5179597828af828c24

Plaintext (hexencoded):

04138a607e378d59c4ec2094ea5cc0b4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x04\x13\x8a`~7\x8dY\xc4\xec \x94\xea\\\xc0\xb4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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