Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

eb14c241c453eca184660274184713c91fc51a6d9f6ffa9f478b68c70cf64590dda58ac9624ce2c6ca2414ea9091a5fae55c05e2ee4e451646fb937b017b36ac

Ciphertext (hexencoded):

eb14c241c453eca184660274184713c9 1fc51a6d9f6ffa9f478b68c70cf64590 dda58ac9624ce2c6ca2414ea9091a5fa e55c05e2ee4e451646fb937b017b36ac

Plaintext (hexencoded):

eb14c241c453eca184660274184713c9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xeb\x14\xc2A\xc4S\xec\xa1\x84f\x02t\x18G\x13\xc9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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