Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

fff69aa40f770ec1a128732df8f2bbe976ab88ffc9b0cfa42955f7545c2e91084e4a2a1c0a16dc496c65e2f88fc31940802dd22978e9e5051719b5d31242e91f

Ciphertext (hexencoded):

fff69aa40f770ec1a128732df8f2bbe9 76ab88ffc9b0cfa42955f7545c2e9108 4e4a2a1c0a16dc496c65e2f88fc31940 802dd22978e9e5051719b5d31242e91f

Plaintext (hexencoded):

fff69aa40f770ec1a128732df8f2bbe9 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xff\xf6\x9a\xa4\x0fw\x0e\xc1\xa1(s-\xf8\xf2\xbb\xe9 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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