Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

5de6305230ff68cab98be6b258180ffdcbe44e7a7b966173b3bbfd5820f31be8838ea97039b472144ccbb443371d080cea293254aaeb4e45ea5dc77650b9b940

Ciphertext (hexencoded):

5de6305230ff68cab98be6b258180ffd cbe44e7a7b966173b3bbfd5820f31be8 838ea97039b472144ccbb443371d080c ea293254aaeb4e45ea5dc77650b9b940

Plaintext (hexencoded):

5de6305230ff68cab98be6b258180ffd 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

]\xe60R0\xffh\xca\xb9\x8b\xe6\xb2X\x18\x0f\xfd {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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