What is SkunkHash?

SkunkHash is a custom chained hashing algorithm that combines four cryptographic hash functions in sequence: Skein, CubeHash, Fugue, and Gost. The algorithm processes input by passing data through each of these functions consecutively, with the output of one serving as the input for the next. Skein provides the initial hashing layer based on the Threefish block cipher, CubeHash applies a sponge-like construction for further mixing, Fugue adds AES-based transformations, and Gost (the Russian federal standard GOST R 34.11-2012, also known as Streebog) completes the chain with a Merkle-Damgård-based hash. This four-function design is more compact than the X-series algorithms but still provides multi-algorithm diversity.

SkunkHash was designed with the goal of providing strong security through algorithmic diversity while maintaining reasonable computational efficiency. The selection of four distinct hash functions from different design families — ARX-based (Skein), sponge-based (CubeHash), AES-based (Fugue), and Merkle-Damgård-based (Gost) — ensures that the algorithm draws on fundamentally different mathematical structures. This makes it challenging to find a single attack vector that could compromise the entire chain. The relatively compact four-function design results in faster execution compared to longer chains like X11 or X17, while still providing meaningful protection against single-algorithm vulnerabilities. For mining purposes, the algorithm was optimized for GPU computation, making it accessible to consumer-grade hardware.

SkunkHash was created for and primarily associated with the Signatum (SIGT) cryptocurrency project, which launched in 2017. The project aimed to provide a privacy-focused digital currency with a unique proof-of-work algorithm that would resist ASIC mining and promote decentralized GPU-based mining. However, the Signatum project faced significant controversy when it experienced a suspected exit scam, with developers abandoning the project shortly after launch. Despite this troubled history, SkunkHash itself remains a technically sound combination of well-studied cryptographic primitives. The algorithm shares several component functions with PHI1612, particularly Skein, CubeHash, Fugue, and Gost, reflecting the common pool of cryptographic building blocks that cryptocurrency designers drew from during this period of algorithm experimentation.