encryption methods

2006-09-10
2012-12-08
  • Hi Igor,
    Now 7-Zip supports ZipCrypto and AES-256 for the *.zip format.
    And AES-256 for the *.7z format.

    I must say, AES-256 encryption/decryption for *.zip archives works fine.
    But if I have an encrypted *.zip archive, I can't see the difference.
    (Is it ZipCrypto or AES-256 encryption?)

    Is it possible (for you) to create a filekey encryption method??!
    I think with such feature the program 7-Zip would be the best compression tool!
    Then such method will be the best one for the privat file transfer!

    See also: http://sourceforge.net/forum/forum.php?thread_id=1313811&forum_id=45797

     
    • Will 7-Zip supports other encryption methods sometimes?

       
      • Igor Pavlov
        Igor Pavlov
        2006-09-14

        What other encryption methods do you need and why?

         
    • How can I see (with GUI): archive(s) encrypted or not???
      Until know you can't see any differnce!
      Are there diference(s)?

       
    • >How can I see (with GUI): archive(s) encrypted or not???

      Hi, sorry for don't respond earlier

      For zip archives there are 2 columns that can tell you wheater the archive is encrypted and the encryption method: Encrypted and Method
      The encrypted column will show a 1 if the file is encrypted and a 0 if not.
      In 7-zip 4.43a6 the method column displays the encryption method before the compression method:
      For example, AES-256 Deflate, AES-256 Bzip2, ZipCrypto Deflate64. If the file is not encrypted then it will show only the compression method.

      Previous versions don't show the encryption method, but if AES256 encryption was used then 7-zip will show the method as "unknown". So, if encrypted is 1 and the method is not unknown then the encryptio is ZipCrypto (Standard but weak encryption). If encrypted is 1 and the method is unknown then it's very likely that the encryption method is AES.

      For 7z archives only the method column is available. If the file is encrypted it will display the compression method and then 7zAES:18 in 7z4.43a6 or 7zAES:[12] in previous versions. I don't know the meaning of the these numbers. For example LZMA:768k 7zAES:18

       
      • Igor Pavlov
        Igor Pavlov
        2006-09-14

        - For 7z archives only the method column is available. If the file is encrypted
        it will display the compression method and then 7zAES:18 in 7z4.43a6 or 7zAES:[12]
        in previous versions. I don't know the meaning of the these numbers. For example
        LZMA:768k 7zAES:18

        7zAES:18 means that we make 2^18=256K SHA-256 iterations to create key for AES. In future I can increase that number.

         
    • For instance "Filekey encryption"!
      Then I don't must remember any password.
      (Then I must only use an individual file.)

      see "Discrib" by Arne Ratjen

      "Discrib_2.1" http://www.freeware-welt.com/discrib_2_1-Details-7293.html
      http://www.freeware-welt.com/discrib_2_1-Download-7293.html
      or
      "Discrib2000" http://www.freeware-welt.com/discrib2000-Download-7292.html

       
    • What does the other users thinking about that?

       
    • IMO, just support 'Password' or 'Keyfile' for existing 7z AES encryption.

      Any other encryption method other than AES is not required. If anyone need twofish, blowfish, cast, serpent, 3DES, IDEA, safer, etc, it is better to use a true encryption software to further encrypt your AES encrypted archive. Do not bloat up 7zip software. 7zip is a archiver software.

       
      • If somebody needs real crypted archives, then try out this tool: http://www.truecrypt.org

         
    • What's with: PAE support - Encryption of files and archives using 5 different methods: Blowfish (128-bit), DES (64-bit), Triple DES (128-bit) and AES 128-bit, ... ?

       
    • I will never encrypt my files using PAE.
      What will happen to Powerarchiver in 5-20 years time? Still around to unzip your PAE file?

      No source code to help.

       
    • I vote also for "filekey encryption"!

      Sometimes you must offer something new, in order to differ from other programs!