Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

3e604aeac2f0707848da7b8c7ae853a2f519c77357867f54c4c670e01ab2a39d4afa209b35d8a544ae5ac2dda8bb157e52c5351c1e7960efe12ac3b87b544fa6

Ciphertext (hexencoded):

3e604aeac2f0707848da7b8c7ae853a2 f519c77357867f54c4c670e01ab2a39d 4afa209b35d8a544ae5ac2dda8bb157e 52c5351c1e7960efe12ac3b87b544fa6

Plaintext (hexencoded):

3e604aeac2f0707848da7b8c7ae853a2 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

>`J\xea\xc2\xf0pxH\xda{\x8cz\xe8S\xa2 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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