Arxid – keyed, non-enumerable ID obfuscation
I kept reaching for Hashids/Sqids to keep sequential IDs out of URLs, but they don't use a real key — the alphabet is shuffled by a salt, and the Sqids FAQ says outright "there is no encryption of any kind." arxid is a keyed reversible permutation instead: a balanced Feistel network with an ARX (add-rotate-xor) round function over a 40-bit domain, mapping to a 7-char base62 code. Feed it an integer, get an unpredictable code back; same key reverses it. Runs ~16x faster than a structurally identical Feistel using HMAC-SHA256, because the round function is integer ops instead of a hash…
Arxid – keyed, non-enumerable ID obfuscation launched on August 5, 2026 with 8 votes, #1,241 of 23,274 launches that month and more than 75% of that year's launches.
What it does
Keyed, reversible permutation for obfuscating sequential integer IDs. A frozen spec plus canonical vectors, so every language agrees byte-for-byte. Rust reference + TypeScript port. - lucasolopes/arxid
Sequential id in, 7-character unordered code out. Reversible with the key. Identical in every language. let arxid = Arxid :: new ( key ) ; arxid . obfuscate_str ( 1000 ) ; // "BmgnvEe" arxid . obfuscate_str ( 1001 ) ; // "4ndJOI8" arxid . obfuscate_str ( 1002 ) ; // "FgxNwC0" arxid . deobfuscate_str ( "4ndJOI8" ) ; // Some(1001) No lookup table, no extra column, no state. Just a keyed permutation over the integers you already have. Obfuscation, not encryption. arxid makes ids non-sequential; it does not make them secret. It is not a MAC, not access control, and has had no independent cryptographic review. Read the threat model before deploying — it says plainly what this does and does not…from github.com
In the maker’s words, at launch
I kept reaching for Hashids/Sqids to keep sequential IDs out of URLs, but they don't use a real key — the alphabet is shuffled by a salt, and the Sqids FAQ says outright "there is no encryption of any kind." arxid is a keyed reversible permutation instead: a balanced Feistel network with an ARX (add-rotate-xor)…
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