Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

7bb8e0cf7389a9429ba1d21493d2a3bf5af8283065b595e93c03df0e0263ac51aa583d4feebe85fd99b4120f6def253f438e9bb6c21407b9e09c55e318acf2b8

Ciphertext (hexencoded):

7bb8e0cf7389a9429ba1d21493d2a3bf 5af8283065b595e93c03df0e0263ac51 aa583d4feebe85fd99b4120f6def253f 438e9bb6c21407b9e09c55e318acf2b8

Plaintext (hexencoded):

7bb8e0cf7389a9429ba1d21493d2a3bf 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

{\xb8\xe0\xcfs\x89\xa9B\x9b\xa1\xd2\x14\x93\xd2\xa3\xbf {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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