Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

a0a6759a9adbcde846e5f1b05593708a57115ecb305f72012184352e1c13e1c579f34595a2c7f083842b190dd85f936b15ffbc9049fa9c99ace87de3b4172b8d

Ciphertext (hexencoded):

a0a6759a9adbcde846e5f1b05593708a 57115ecb305f72012184352e1c13e1c5 79f34595a2c7f083842b190dd85f936b 15ffbc9049fa9c99ace87de3b4172b8d

Plaintext (hexencoded):

a0a6759a9adbcde846e5f1b05593708a 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xa0\xa6u\x9a\x9a\xdb\xcd\xe8F\xe5\xf1\xb0U\x93p\x8a {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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