Date: Sat, 4 Mar 2017 18:13:25 +0200 From: Юлиан Машаев <mashaev93@...il.com> To: john-users@...ts.openwall.com Subject: Extracting CRC of files from RAR archive Hello, I want to obtain few bytes from password protected RAR file, knowing all other bytes. I tested "brute-force" attack and I obatined 10 bytes(just enough for me). Now the problem is that sometimes this RAR file can be encrypted both data and file list. E.g. on file without full encryption rar2john returns: 2017_04_roul.rar:$rar3$**1**de8ad915db6e3d57**69ad6816*(this is CRC32)*19424*125278*... but when filelist is encrypted: 2017_04_roul_n.rar:$rar3$**0* *61f78a76817adc3d*5023d65d291834942e414015cca48084 No CRC is returned :( Is it possible somehow to obtain it?(there is just one text file, and I know most of the data except few bytes) As far as I remember, CRC is also encrypted in second case, and at opening - both CRC and data are decrypted, then CRC of decrypted data is compared with decrypted CRC. Seems safe enough, but still, I would like to find some methods to extract checksum of the file. Thanks
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