Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

416a36af26344e2cd69c2302813f1983e0f055c5401dc43520458ddf83fc232ae953701ec1122a52c661dd2f0fb97d6a90440f0f5ae5c586920a8fe49cfafb79

Ciphertext (hexencoded):

416a36af26344e2cd69c2302813f1983 e0f055c5401dc43520458ddf83fc232a e953701ec1122a52c661dd2f0fb97d6a 90440f0f5ae5c586920a8fe49cfafb79

Plaintext (hexencoded):

416a36af26344e2cd69c2302813f1983 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

Aj6\xaf&4N,\xd6\x9c#\x02\x81?\x19\x83 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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