Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

89388820f1a77c13d20a8292443368bf436e6c419d37ae3eed7f5095a4acfb3452429d76271ac9f2e2c0fddb10a343bd6b25597c03630f9938eb24e27f0924ab

Ciphertext (hexencoded):

89388820f1a77c13d20a8292443368bf 436e6c419d37ae3eed7f5095a4acfb34 52429d76271ac9f2e2c0fddb10a343bd 6b25597c03630f9938eb24e27f0924ab

Plaintext (hexencoded):

89388820f1a77c13d20a8292443368bf 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x898\x88 \xf1\xa7|\x13\xd2\n\x82\x92D3h\xbf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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