Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3cb4912bd101e5f0b0ede1bbfce9934d3273a3070d2303e3d4bd1f48fe0744ef726a272e6c048884e246ecb794e562d63a8f75bd8cf895eba401de5b53d3b0b3

Ciphertext (hexencoded):

3cb4912bd101e5f0b0ede1bbfce9934d 3273a3070d2303e3d4bd1f48fe0744ef 726a272e6c048884e246ecb794e562d6 3a8f75bd8cf895eba401de5b53d3b0b3

Plaintext (hexencoded):

3cb4912bd101e5f0b0ede1bbfce9934d 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

<\xb4\x91+\xd1\x01\xe5\xf0\xb0\xed\xe1\xbb\xfc\xe9\x93M {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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