Software Archive

Note that for some of these links, you must click through (left click) in order to download the file -- even though the HTML points at the file itself, Tripod intercepts downloads and redirects you to a special page. It's a small price to pay for the web space.

• hurst.c Rescaled range analysis: Hurst exponents.

  
  

• spiro-0.3.tgz A program for PalmOS that draws hypotrochoids (GPL); or get the prc file by itself.

  
  

• dla.tgz Diffusion Limited Aggregation.
• kdtree.tgz Calculate the topological and metric entropies of a 2D trajectory via symbolic dynamics.
• quat.tgz Quaternion Fractals. This is the software I used to make all the fractals that appear in my Fractal Folder.
• patsolve-3.0.tgz Solves Freecell and Seahaven Towers games. Very fast. Near-minimal solutions. GPL. Patches are included to extract board layouts from some popular versions. Also:
• getgame.tgz A PalmOS program to dump the games produced by Patience 2.5 for solving by patsolve. You'll need pilot-xfer or similar to use this.
• FLTK widgets A small collection of widgets for the Fast Light Tool Kit.
• tcpbroker-1.1.tar.gz A server that connects two incoming sockets together -- a twist on the idea of port forwarding. Optionally uses the tinysrp library, below.
• libtinysrp-0.7.5.tar.gz The Tiny SRP Library. This is a stripped-down version of srp-1.7.1 and openssl-0.9.6 that contains only what is necessary for authentication. It's great for adding secure authentication to your small client/server project. Also includes the tinysrp protocol, which reduces socket authentication to a single function call on each of the client and server. Click here to download my GPG signature of libtinysrp-0.7.5.tar (note: not the .gz file -- some browsers may unzip automatically). My GPG key is available on the pgp.net keyserver.
• SRPSocket Click here for more information on SRP, and for a very simple implementation that creates an authenticated socket using Python.
• nc110-tinysrp.patch This is a patch to netcat 1.10 that enables SRP authentication in both client and server modes. With this patch, netcat's GAPING_SECURITY_HOLE isn't so gaping any more; rather, it's a reasonable way to set up a quick and easy server. The patch also includes example scripts for setting up a simple (but secure) authenticating login server.
• OpenSSH-3.5p1-srp.patch.gz (Left Click this link.) This is a patch for OpenSSH (portable) that enables SRP authentication. You will need OpenSSL; the Stanford SRP distribution is not required, although this is compatible with that. Click here to download my GPG signature of OpenSSH-3.5p1-srp.patch (note: not the .gz file -- some browsers may unzip automatically). My GPG key is available on the pgp.net keyserver.
• OpenSSH-snap.patch.gz (Left Click this link.) This is a patch for a recent (20021007) snapshot of OpenSSH (portable) which enables SRP authentication. (You must run "make distprep" to regenerate the .0 files.)
• srpcrack.tar.gz This program cracks SRP verifiers (analogous to passwd hashes) using a dictionary attack. The dictionary is fixed, not dynamic, but this code can easily be incorporated into more versatile crackers. Initial tests suggest that SRP verifiers with kilobit primes are about as much work to crack as md5_crypt() hashes (many hundreds to thousands of guesses per second can be checked on circa 2000 hardware). That is, if your server is compromised and the verifier database stolen, and if your users have chosen weak passwords (single dictionary words like "green") they can be found with this program in a few minutes. Good passphrases take years/centuries.
• vdmfec-1.0.tgz VDMFEC implements Block ECC using a Forward Error Correction (FEC) code based on Vandermonde (VDM) matrices in GF(2^8) due to Luigi Rizzo. Given the FEC parameters K and N, with N greater than K, N blocks are written for every K input blocks in such a way that any K blocks are sufficient to reconstruct the data. That is, up to N - K blocks out of every group of N blocks may be lost without loss of data. Its primary application is intended to be in recovering data from unreliable media such as diskettes. The home page for FEC is here.