To be honest - WRITE the passwords down somewhere safe. OR use a set of passwords and only that set so you just have to try the one at a time.
I use about a dozen passwords. If I need to create one that is not part of my set of passwords, I write it down on a card and stick it in a "safe place". That way if I do not remember what it is, I just pull out the "cards" and find the document name and read the password written there. I know a lot of businesses that use a locked desk drawer to hold things like door access codes and passwords. On 09/15/2013 01:31 PM, Toki Kantoor wrote: > On 09/11/2013 07:09 AM, tangchaojie wrote: > >> I Forger My password of the Libreoffice file . >> Who can tell me how to deal with it ? > LibO 3.4.5 and lower can write files whose password protection relies on > Blowfish; > LibO 3.4.4 and lower can read files whose password protection relies on > Blowfish; > LibO 3.4.5 and higher can read files whose password protection relies on > AES-256; > LibO 3.5.0 and higher can write files whose password protection relies > on AES-256; > > The Crypto++ library contains routines for encrypting/decrypting > blowfish, AES-256, and other algorithms for ciphers. > > In 2001, four or five firms, worldwide, offered commercial OOo password > recovery services. > > One of the firms frankly admitted that they used brute force. The setup > fee paid for the computers used for the "attack". The monthly fee > covered the utility bills that the "attack" generated. FWIW, this firm > now appears to be out of business. > > http://openoffice-password-recovery.en.softonic.com/ offers a tool that > they claim: > « OpenOffice Password Recovery is a software program to restore any > forgotten passwords from any document created with Open Office. This > tool supports all Open Office applications including OpenOffice Calc, > Impress, Math, Writer and Draw. > OpenOffice Password Recovery also features protection removal so you can > get rid of the read-only restriction used for protection with some files. » > > http://openoffice-password-recovery.sharewarejunction.com/ offers an OOo > extension for US$79.00 that allegedly recovers passwords from OOo > documents. > > Those tools might work, but I have my doubts. Whilst there are known > attacks that result in determining the password faster than using brute > force, those attacks require at least a century to complete, using > Beowulf Clusters that are currently commercially available. > > jonathon -- To unsubscribe e-mail to: [email protected] Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/ Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette List archive: http://listarchives.libreoffice.org/global/users/ All messages sent to this list will be publicly archived and cannot be deleted
