Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

9b4e46a642371fb15ca5294c8f0adb7898d60ad8ae16341bab78c354723981aaf5e23329281138c9468bd00392704b1a48da491cb04a12873b734e142f64cd8b

Ciphertext (hexencoded):

9b4e46a642371fb15ca5294c8f0adb78 98d60ad8ae16341bab78c354723981aa f5e23329281138c9468bd00392704b1a 48da491cb04a12873b734e142f64cd8b

Plaintext (hexencoded):

9b4e46a642371fb15ca5294c8f0adb78 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x9bNF\xa6B7\x1f\xb1\\\xa5)L\x8f\n\xdbx {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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