Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

88b3ac108b75006f3a309f74c1d3f83bd4b59831c14e95fd0b9cd3545c2a668b5f5b250a3de28f41d423ece4909a65db8427ae64851079c54af8c57befdcde5e

Ciphertext (hexencoded):

88b3ac108b75006f3a309f74c1d3f83b d4b59831c14e95fd0b9cd3545c2a668b 5f5b250a3de28f41d423ece4909a65db 8427ae64851079c54af8c57befdcde5e

Plaintext (hexencoded):

88b3ac108b75006f3a309f74c1d3f83b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x88\xb3\xac\x10\x8bu\x00o:0\x9ft\xc1\xd3\xf8; {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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