Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

7fd0222bab0d31931bde2d5c45c00bb44c7100bab55a6767e6f4c0191a0e2c750b2e1deeab1479315fc9182944eaa163fea5124287fc8d935b23f7baf40818fd

Ciphertext (hexencoded):

7fd0222bab0d31931bde2d5c45c00bb4 4c7100bab55a6767e6f4c0191a0e2c75 0b2e1deeab1479315fc9182944eaa163 fea5124287fc8d935b23f7baf40818fd

Plaintext (hexencoded):

7fd0222bab0d31931bde2d5c45c00bb4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x7f\xd0"+\xab\r1\x93\x1b\xde-\\E\xc0\x0b\xb4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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