Block cipher challenge

Level: CTR mode

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Ciphertext (hexencoded), for easy copy-paste

1a29616a0f9c868d0939cea1d34b3da43bda32cdf26cab69782926d77028fd0a5e42a6ebddedcdf0722bcfa7373f8105a50cce47aa3a7a587015713917e36f79

Ciphertext (hexencoded):

1a29616a0f9c868d0939cea1d34b3da4 3bda32cdf26cab69782926d77028fd0a 5e42a6ebddedcdf0722bcfa7373f8105 a50cce47aa3a7a587015713917e36f79

Plaintext (hexencoded):

1a29616a0f9c868d0939cea1d34b3da4 7b22757365726e616d65223a20226775 657374222c202269735f677565737422 3a20747275657d090909090909090909

Plaintext:

\x1a)aj\x0f\x9c\x86\x8d\t9\xce\xa1\xd3K=\xa4 {"username": "gu est", "is_guest" : true}\t\t\t\t\t\t\t\t\t

Final plaintext

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