Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

2a26e84ee804629e6f0bd96b8e5aa4e835739905248d0e3061631d52347523599db37059578b07489a49506d2b302fca872404a5e7f2fa4869355cfeddb88e3a

Ciphertext (hexencoded):

2a26e84ee804629e6f0bd96b8e5aa4e8 35739905248d0e3061631d5234752359 9db37059578b07489a49506d2b302fca 872404a5e7f2fa4869355cfeddb88e3a

Plaintext (hexencoded):

2a26e84ee804629e6f0bd96b8e5aa4e8 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

*&\xe8N\xe8\x04b\x9eo\x0b\xd9k\x8eZ\xa4\xe8 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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