Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

f38dbcfa8bb17e534f73916859d00c4fd9847ed218819e3bcd9a27684571bde132e0f3785d0b844be1bdd1f270a9de9c74691ec8d68f896742d3f221645a7345

Ciphertext (hexencoded):

f38dbcfa8bb17e534f73916859d00c4f d9847ed218819e3bcd9a27684571bde1 32e0f3785d0b844be1bdd1f270a9de9c 74691ec8d68f896742d3f221645a7345

Plaintext (hexencoded):

f38dbcfa8bb17e534f73916859d00c4f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xf3\x8d\xbc\xfa\x8b\xb1~SOs\x91hY\xd0\x0cO {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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