Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

33b8a498c7681e740bdbc3441c945fd96f15c8c94f3245185129c9f15b42727cb723823a9473d40a2489ec69d32e8e662af5a0aa4a4c46127a30b877e0fd5eac

Ciphertext (hexencoded):

33b8a498c7681e740bdbc3441c945fd9 6f15c8c94f3245185129c9f15b42727c b723823a9473d40a2489ec69d32e8e66 2af5a0aa4a4c46127a30b877e0fd5eac

Plaintext (hexencoded):

33b8a498c7681e740bdbc3441c945fd9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

3\xb8\xa4\x98\xc7h\x1et\x0b\xdb\xc3D\x1c\x94_\xd9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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