Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3d33a18243e23f212c97926cea6bc65f4d5a1fa8f23f561fe2b92f227909fff69201b81f2781d0d301ed57fab0ffb0af1a8f71c1b134fbee7042d2a017d0f306

Ciphertext (hexencoded):

3d33a18243e23f212c97926cea6bc65f 4d5a1fa8f23f561fe2b92f227909fff6 9201b81f2781d0d301ed57fab0ffb0af 1a8f71c1b134fbee7042d2a017d0f306

Plaintext (hexencoded):

3d33a18243e23f212c97926cea6bc65f 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

=3\xa1\x82C\xe2?!,\x97\x92l\xeak\xc6_ {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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