Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3dfc5ea8f5b24710df2bbe31fef36f31e9fc949f7df56de53cfd04f3fb33a2e805d47bab48e8084d021c6dc16a1e98b41afa031a8be3a089b18ddd1f65ac0eba

Ciphertext (hexencoded):

3dfc5ea8f5b24710df2bbe31fef36f31 e9fc949f7df56de53cfd04f3fb33a2e8 05d47bab48e8084d021c6dc16a1e98b4 1afa031a8be3a089b18ddd1f65ac0eba

Plaintext (hexencoded):

3dfc5ea8f5b24710df2bbe31fef36f31 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

=\xfc^\xa8\xf5\xb2G\x10\xdf+\xbe1\xfe\xf3o1 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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