Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

79e4938ef7908aa3461d99f7bdc387cf28d1258d4a6cd4b8be418105295558bb48fed98e8dbcb199d628455473b0c4db152bbb8630a258cb25c7ca54c461e147

Ciphertext (hexencoded):

79e4938ef7908aa3461d99f7bdc387cf 28d1258d4a6cd4b8be418105295558bb 48fed98e8dbcb199d628455473b0c4db 152bbb8630a258cb25c7ca54c461e147

Plaintext (hexencoded):

79e4938ef7908aa3461d99f7bdc387cf 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

y\xe4\x93\x8e\xf7\x90\x8a\xa3F\x1d\x99\xf7\xbd\xc3\x87\xcf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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