Date: Thu, 28 Jul 2005 10:32:17 +0000 (UTC) From: Renato Botelho <garga@FreeBSD.org> To: ports-committers@FreeBSD.org, cvs-ports@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: ports/security Makefile ports/security/pkcrack Makefile distinfo pkg-descr Message-ID: <200507281032.j6SAWHTp038164@repoman.freebsd.org>
next in thread | raw e-mail | index | archive | help
garga 2005-07-28 10:32:17 UTC FreeBSD ports repository Modified files: security Makefile Added files: security/pkcrack Makefile distinfo pkg-descr Log: This package implements an algorithm for breaking the PkZip cipher that was devised by Eli Biham and Paul Kocher. This program applies a known plaintext attack to an encrypted file. A known-plaintext-attack recovers a password using the encrypted file and (part of) the unencrypted file. Please note that cryptographers use the word 'plaintext' for any kind of unencrypted data - not necessarily readable ASCII text. Before you ask why somebody may want to know the password when he already knows the plaintext think of the following situations: - Usually there's a large number of files in a ZIP-archive. Usually all these files are encrypted using the same password. So if you know one of the files, you can recover the password and decrypt the other files. - You need to know only a part of the plaintext (at least 13 bytes). Many files have commonly known headers, like DOS .EXE-files. Knowing a reasonably long header you can recover the password and decrypt the entire file. WWW: http://www.unix-ag.uni-kl.de/~conrad/krypto/pkcrack.html PR: ports/84192 Submitted by: Emanuel Haupt <ehaupt@critical.ch> Revision Changes Path 1.629 +1 -0 ports/security/Makefile 1.1 +50 -0 ports/security/pkcrack/Makefile (new) 1.1 +2 -0 ports/security/pkcrack/distinfo (new) 1.1 +24 -0 ports/security/pkcrack/pkg-descr (new)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200507281032.j6SAWHTp038164>