Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f748b89ed2bd49450bb580d575a7a01ece8514c227bbbe6ecaabb50e6f0aec00789bc7555802918bfe9f76c623526dd9f1d97a8b02fe72e1eaca34da195c4e19

Ciphertext (hexencoded):

f748b89ed2bd49450bb580d575a7a01e ce8514c227bbbe6ecaabb50e6f0aec00 789bc7555802918bfe9f76c623526dd9 f1d97a8b02fe72e1eaca34da195c4e19

Plaintext (hexencoded):

f748b89ed2bd49450bb580d575a7a01e 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf7H\xb8\x9e\xd2\xbdIE\x0b\xb5\x80\xd5u\xa7\xa0\x1e {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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