Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3569d18ab3aeadde4396b12ae192d3bd2297548813c08801631713f675aaea8e6c39d5f43aa0224c34f3e9af42f271863f5429ce5090e142960ead225f8a0554

Ciphertext (hexencoded):

3569d18ab3aeadde4396b12ae192d3bd 2297548813c08801631713f675aaea8e 6c39d5f43aa0224c34f3e9af42f27186 3f5429ce5090e142960ead225f8a0554

Plaintext (hexencoded):

3569d18ab3aeadde4396b12ae192d3bd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

5i\xd1\x8a\xb3\xae\xad\xdeC\x96\xb1*\xe1\x92\xd3\xbd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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