Date: Mon, 22 Jun 2020 14:50:45 +0200 From: Johny Krekan <krekan@...nykrekan.com> To: john-users@...ts.openwall.com Subject: decryption without original password Hello, I have a few questions for experienced people who are interested in cryptography I have tryed Advanced office password breaker. It is product from Elcomsoft which can break 40-bit encryption which is used in Word/Excel versions 97/2000. It decrypts document without recovering the actual password. It recovers the key which is generated from the password. 1. Is doing something like this possible with John on old office documents? more interesting thing: I have read on : http://lastbit.com/express-recovery.asp That they are able to recover the password which was used to protect the document as well as the document itself. I assume the key recovery process is similar to Advanced Office password breaker but: 2. What method do you think they are using to recover the original password? Regular bruteforce/dictionary? They mention that it can happen that they will recover some password that will look quite unusual but will be usable to open the file as well as the original passwordd. Is this because the 40 bit key is too short? 3. What other hash types are vulnerable so it is possible to find password which is much different from original but it will allow to decrypt protected resource? Thanx for information Johny Krekan
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