Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

fc483a1af7b6ac46dbab47e63ef63a01ba361699d79fc83009e5639a91adb5a5ac1fd54b3f4fbe0f40d23914622b1e63a4bdd2320a7b1e08419a572f87e7c8d8

Ciphertext (hexencoded):

fc483a1af7b6ac46dbab47e63ef63a01 ba361699d79fc83009e5639a91adb5a5 ac1fd54b3f4fbe0f40d23914622b1e63 a4bdd2320a7b1e08419a572f87e7c8d8

Plaintext (hexencoded):

fc483a1af7b6ac46dbab47e63ef63a01 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xfcH:\x1a\xf7\xb6\xacF\xdb\xabG\xe6>\xf6:\x01 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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