Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d89f0fba5c7a25956d316bc3676fb887178cf452a70a876683a739349c7251ac1c708e2ed7b4836a5c34f8791f3add66d565909a0f9c1dbfb4de0e5ab179bacf

Ciphertext (hexencoded):

d89f0fba5c7a25956d316bc3676fb887 178cf452a70a876683a739349c7251ac 1c708e2ed7b4836a5c34f8791f3add66 d565909a0f9c1dbfb4de0e5ab179bacf

Plaintext (hexencoded):

d89f0fba5c7a25956d316bc3676fb887 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd8\x9f\x0f\xba\\z%\x95m1k\xc3go\xb8\x87 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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