Software releases

release of the cryptopANT library for IP address anonymization

cryptopANT v1.0 (stable) has been released (available at

cryptopANT is a C library for IP address anonymization using crypto-PAn algorithm, originally defined by Georgia Tech. The library supports anonymization and de-anonymization (provided you possess a secret key) of IPv4, IPv6, and MAC addresses. The software release includes sample utilities that anonymize IP addresses in text, but we expect most use of the library will be as part of other programs. The Crypto-PAn anonymization scheme was developed by Xu, Fan, Ammar, and Moon at Georgia Tech and described in“Prefix-Preserving IP Address Anonymization”, Computer Networks, Volume 46, Issue 2, 7 October 2004, Pages 253-272, Elsevier. Our library is independent (and not binary compatible) of theirs.

Despite this being the first release as a library, the code has been in use for more than 10 years in other tools.  It had been part of our other software packages, such as dag_scrubber for years.  By popular request, we’re finally releasing it as a separate package.

The library is packaged with an example binary (scramble_ips) that can be used to anonymize text ips.

See also the crypto-PAn page at Georgia Tech here.

Software releases

mtracecap: New utility for multi-point capture released

mtracecap v0.1 (beta) has been released (available at

This tool is designed to capture packets from multiple sources and write its output to a single file.  Its build requires a local install of libtrace library (version 4.0 or older) and supports all sources supported by the library, such as pcap based interfaces, linux-specific ring interfaces, pcap and erf outputs and many more!  See them all listed when you run mtracecap with -H option.  DAG device capture is optional, depending on local DAG libraries being present.

An important feature of this tool is being able to roll output into multiple files either based on either maximum file size (e.g.  “-S 100” option will make it write output in 100MB chunks), or system time (e.g. “-G 180” option will rotate output every 180 seconds).

Finally, the tool can use external commands to work on the input before writing it to a file using a pipe (see –pipeout option).  This can be useful if you want to compute some statistics on the fly or compress output using an external compressor.  Using this option will eliminate extra disk read-write operations if all you want to do is to compress the output.