Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

cd30b28b261014ae14bf253df0c144a9420549248191e61848c8edf7a28aeba21502bdc1fe94f41ee4d325409ae3942a336279408f4db0f8fcb9877c1fcbda92

Ciphertext (hexencoded):

cd30b28b261014ae14bf253df0c144a9 420549248191e61848c8edf7a28aeba2 1502bdc1fe94f41ee4d325409ae3942a 336279408f4db0f8fcb9877c1fcbda92

Plaintext (hexencoded):

cd30b28b261014ae14bf253df0c144a9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xcd0\xb2\x8b&\x10\x14\xae\x14\xbf%=\xf0\xc1D\xa9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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