Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

e028414f52edcd0e94b63d0e92a476da8c6901a76af5d3137502088c3cd90822295d553e841ba5fa8ad7dbca630aa22afcd3c26db0a50faa167dee016a5e65f4

Ciphertext (hexencoded):

e028414f52edcd0e94b63d0e92a476da 8c6901a76af5d3137502088c3cd90822 295d553e841ba5fa8ad7dbca630aa22a fcd3c26db0a50faa167dee016a5e65f4

Plaintext (hexencoded):

e028414f52edcd0e94b63d0e92a476da 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xe0(AOR\xed\xcd\x0e\x94\xb6=\x0e\x92\xa4v\xda {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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