Block cipher challenge

Level: CBC mode

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Ciphertext (hexencoded), for easy copy-paste

909044754be40a38246dd80e97bd023455c67f114278b1bb40b33c33d0b9511f2a86407aaa6802e559d062acec3ed3417a6c5ce079146dc2a28771b94b1ee8f4

Ciphertext (hexencoded):

909044754be40a38246dd80e97bd0234 55c67f114278b1bb40b33c33d0b9511f 2a86407aaa6802e559d062acec3ed341 7a6c5ce079146dc2a28771b94b1ee8f4

Plaintext (hexencoded):

909044754be40a38246dd80e97bd0234 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x90\x90DuK\xe4\n8$m\xd8\x0e\x97\xbd\x024 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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