Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

d5165da0efcd2867d3d92544e46965041e1a28fd2273d3fb641a9711d403b1d7d5886b22308a7adeb4479c61d3e860371675086a046147933b59ca60a87e14d3

Ciphertext (hexencoded):

d5165da0efcd2867d3d92544e4696504 1e1a28fd2273d3fb641a9711d403b1d7 d5886b22308a7adeb4479c61d3e86037 1675086a046147933b59ca60a87e14d3

Plaintext (hexencoded):

d5165da0efcd2867d3d92544e4696504 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\xd5\x16]\xa0\xef\xcd(g\xd3\xd9%D\xe4ie\x04 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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