Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

dfe6ebca312a0f6a42f2b4819430ccdb4b29c631d1b14580325bcd2887f7035bb1b89cdb3913a50e3177fac4282a26c6851e722745fd7da67cc595ac21dce26f

Ciphertext (hexencoded):

dfe6ebca312a0f6a42f2b4819430ccdb 4b29c631d1b14580325bcd2887f7035b b1b89cdb3913a50e3177fac4282a26c6 851e722745fd7da67cc595ac21dce26f

Plaintext (hexencoded):

dfe6ebca312a0f6a42f2b4819430ccdb 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xdf\xe6\xeb\xca1*\x0fjB\xf2\xb4\x81\x940\xcc\xdb {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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