Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

d7fe67ecb577ffdd7f0e436cabc7223b6909d317a0a853c3846ae6a53c28ef96ef62c09fb3cfe78c6f36c07cd783aa2c84addeb6ecc11d8ec5f0f7a5f975fb15

Ciphertext (hexencoded):

d7fe67ecb577ffdd7f0e436cabc7223b 6909d317a0a853c3846ae6a53c28ef96 ef62c09fb3cfe78c6f36c07cd783aa2c 84addeb6ecc11d8ec5f0f7a5f975fb15

Plaintext (hexencoded):

d7fe67ecb577ffdd7f0e436cabc7223b 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd7\xfeg\xec\xb5w\xff\xdd\x7f\x0eCl\xab\xc7"; {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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