nhc98

nhc98
Name	nhc98
Developer	Historical Cryptography Group
Released	1998
Latest release	1.2
Operating system	Unix-like, Linux, BSD
License	BSD-like
Genre	Cryptographic library

nhc98 is a cryptographic software package introduced in 1998 that implemented a suite of hash functions, message authentication schemes, and related primitives for Unix-like systems. Conceived in the late 1990s amid developments at institutions concerned with applied cryptography, nhc98 found use in academic benchmarks, interoperability testing, and cryptanalytic challenges. The project intersected with contemporary efforts by researchers and organizations working on hash design, standards, and open-source toolchains.

History

nhc98 emerged in a period influenced by results from the MD5 and SHA-1 communities and debates at venues such as the RSA Conference, CRYPTO, and Eurocrypt. Early contributors included researchers affiliated with the IACR and laboratories connected to Bell Labs, MIT, and Berkeley. The package was discussed at workshops alongside implementations from projects like OpenSSL, GnuPG, and PGP Corporation tools, and featured in comparative studies involving candidates from the SHA-3 competition era precursors. Historical milestones include a 1999 integration test with OpenBSD toolchains, a 2001 portability audit influenced by work from Linux Kernel contributors, and citations in papers from groups at Stanford University and University of Cambridge.

Design and Architecture

nhc98's architecture followed modular principles similar to libraries such as libgcrypt and Crypto++. Its core components were implemented in ANSI C with assembly optimizations for platforms exemplified by x86 and SPARC processors. The design separated interfaces for hash algorithms, key-derivation functions, and message authentication codes mirroring patterns used by PKCS#1 and RFC 2104-style HMAC constructions. Build systems used tools common to open-source projects like Autoconf and Makefile conventions employed by Debian and Red Hat packaging. Interoperability layers were crafted to align with APIs present in OpenSSL and NSS so that applications from projects like Apache HTTP Server and Postfix could integrate nhc98 routines.

Applications and Implementations

Implementations of nhc98 were incorporated into academic projects, test suites, and experimental secure shells inspired by OpenSSH. Students and researchers at institutions such as Carnegie Mellon University, ETH Zurich, and Imperial College London used nhc98 in coursework and comparative evaluations against implementations in GnuPG and TrueCrypt-era systems. Industrial adopters in telecommunications and storage, including teams at Nokia and EMC Corporation, used the library for prototype secure hashing and integrity checks alongside standard tools like rsync and tar. Implementations existed on platforms ranging from workstation environments like FreeBSD and NetBSD to embedded systems running on ARM-based boards used in sensor-network testbeds at MIT Media Lab.

Performance and Evaluation

Performance studies compared nhc98 against contemporary libraries such as OpenSSL, Crypto++, and libgcrypt across metrics including cycles per byte on processors from vendors like Intel, AMD, and Sun Microsystems. Benchmarks were run on testbeds maintained by research groups at University of California, Berkeley and Princeton University and published in proceedings of conferences like USENIX and ACM CCS. Results typically reported throughput, memory footprint, and vectorization opportunities on SIMD extensions such as MMX and SSE. Evaluations examined portability impacts on distributions managed by Debian Project and Gentoo Linux maintainers, and in comparative latency tests against software used by Nginx and Lighttpd web servers.

Security and Cryptanalysis

nhc98’s algorithms and codebase attracted cryptanalytic attention from researchers presenting at venues including Eurocrypt, ASIACRYPT, and IACR' workshops. Analysts from groups at University College London, EPFL, and Royal Holloway, University of London examined collision resistance and preimage resistance properties, often comparing findings to known weaknesses in MD5 and SHA-1. Security audits referenced methodologies from authors of standards such as FIPS 180-2 and papers by cryptographers associated with NIST and the NSA. Responsible-disclosure reports to maintainers echoed practices followed by entities like CERT Coordination Center and triggered patches coordinated with package maintainers in Debian and OpenBSD.

Licensing and Availability

nhc98 was distributed under a permissive BSD-like license akin to licenses used by FreeBSD and many projects in the X Window System ecosystem, facilitating inclusion in distributions and derivative works. Source tarballs and packaging scripts were archived in repositories and mirrors maintained by organizations such as SourceForge and later mirrored in community archives used by GitHub-era workflows. Binary packages were occasionally included in release trees for Slackware and Arch Linux community repositories, subject to packaging policies from maintainers associated with RPM-based and APT-based ecosystems.

Category:Cryptographic software