Life & fun · alternatives · 2026

24 alternatives to Signum – Kotlin Multiplatform Cryptography and PKI Library

An OSS KMP crypto + PKI library with a comprehensive ASN.1 engine. Android and iOS targets come with hardware-backed crypto + key storage, and native biometric auth.

Signum is an open-source cryptography and public key infrastructure library built for Kotlin Multiplatform development. It provides comprehensive ASN.1 support for handling structured data formats. On Android and iOS… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   Kotlin Money▲427

   Manipulating monetary amounts is a common computing chore. However, no mainstream language has a first-class data type for representing money, it’s up to programmers to code abstractions for it. This isn’t an issue per se until dealing with rounding issues from operations like installment payments (e.g., buy now, pay later), foreign exchange, or even simple things like fee processing and tax collection. Inspired by my days at N26 Brasil dealing with these challenges, I introduce Money: a Kotlin library that makes monetary calculations and allocations easy.

   2024 · blog.eriksen.com.br · its alternatives →

2. 2
   PAST, a secure alternative to JWT▲362

   Platform-Agnostic Security Tokens. Contribute to paragonie/paseto development by creating an account on GitHub.

   2018 · github.com · its alternatives →

3. 3
   Node.js port of WhisperSystem's libsignal▲88

   Signal protocol implementation for Node.js. Contribute to ForstaLabs/libsignal-node development by creating an account on GitHub.

   2017 · github.com · its alternatives →

4. 4
   FractalCrypt 2.0 – free deniable encryption cryptoarchiver▲128

   Free cross-platform deniable encryption cryptoarchiver - GitHub - zorggomat/FractalCryptGUI: Free cross-platform deniable encryption cryptoarchiver

   2021 · github.com · its alternatives →

5. 5
   Monocypher: a small, easy to use crypto library▲90

   Monocypher is a small, auditable, easy to use crypto library.

   2017 · loup-vaillant.fr · its alternatives →

6. 6
   My Book Bulletproof TLS and PKI (Second Edition) Is Out▲134

   Hello HN. I am excited to share with you my new book, Bulletproof TLS and PKI. I've worked in this space since the very early days (think SSLv2), always frustrated with the fact that the field is vast but the documentation poor. That first led me to create SSL Labs (which ended up being very popular) and then the first edition of my book (in 2014), where I aimed to cover everything a curious person needed to know about SSL/TLS and PKI. Most importantly, it's a very practical book that you can use to just learn what you need at that moment. The second edition (just out) adds coverage of…

   2022 · feistyduck.com · its alternatives →

7. 7
   SignaKit▲125

   Handwritten signature framework for iOS

   2016 · its alternatives →

8. 8
   Logto beta – build universal sign-in, auth, and identity with ease▲59

   🧑‍🚀 Authentication and authorization infrastructure for SaaS and AI apps, built on OIDC and OAuth 2.1 with multi-tenancy, SSO, and RBAC. - logto-io/logto

   2022 · github.com · its alternatives →

9. 9
   Open-source Auth0 alternative Ory Kratos v0.13 released – nearing v1.0▲88

   Headless cloud-native authentication and identity management written in Go. Scales to a billion+ users. Replace Homegrown, Auth0, Okta, Firebase with better UX and DX. Passkeys, Social Sign In, OIDC, Magic Link, Multi-Factor Auth, SMS, SAML, TOTP, and more. Runs everywhere, runs best on Ory Network.

   2023 · github.com · its alternatives →

10. 10
    Kotlin∇: Shape-Safe Symbolic Differentiation with Algebraic Data Types▲15

    🧩 Shape-Safe Symbolic Differentiation with Algebraic Data Types - breandan/kotlingrad

    2021 · github.com · its alternatives →

11. 11
    Torii – a framework agnostic authentication library for Rust▲80

    Torii is a powerful authentication framework for Rust applications that gives you complete control over your users' data. - cmackenzie1/torii-rs

    2025 · github.com · its alternatives →

12. 12
    Go library for concise, unambiguous and URL-safe UUIDs▲50

    A generator library for concise, unambiguous and URL-safe UUIDs - lithammer/shortuuid

    2015 · github.com · its alternatives →

13. 13KF
    Krypton for Teams – Simple SSH Key Storage for DevOps▲53

    Unphishable, zero-touch two-factor logins

    2018 · krypt.co · its alternatives →

14. 14
    KMPShip▲15

    Hey HN, I'm an indie developer who has been building mobile apps for a while. After repeating the same setup across projects (auth, CI/CD, payments, notifications), I built a boilerplate to save time and focus on actual features. KMPShip is a Kotlin/Compose Multiplatform boilerplate that helps you build Android and iOS apps from a single shared codebase. It includes: Shared codebase (for UI, domain and data layers), Firebase Auth, Google/Apple sign-in, In-App purchases & subscriptions, local & push notifications, CI/CD setup, full documentation and a small community space…

    2025 · kmpship.app · its alternatives →

15. 15
    a minimal Lisp with closures, macros and gc in 1400 lines of C▲11

    KISS My Lisp - an implementation in pure C99 of a minimal Lisp language. - kototama/kml

    2012 · github.com · its alternatives →

16. 16
    A Solidity library for verifying Ethereum message multi-signatures▲8

    ✍️ A Solidity library for verifying Ethereum message multi-signatures. - dsys/solidity-sigutils

    2018 · github.com · its alternatives →

17. 17
    A signed arbitrary precision integer arithmetic library▲7

    signed arbitrary precision arithmetic library. Contribute to say4n/infinity development by creating an account on GitHub.

    2018 · github.com · its alternatives →

18. 18
    A key-value store built with homomorphic encryption▲22

    An encrypted, in-memory, key-value store. Contribute to ankane/morph development by creating an account on GitHub.

    2020 · github.com · its alternatives →

19. 19SC
    Saltshaker-Crypto, NPM to Sign, Verify, Encrypt and Decrypt with Nacl▲20

    2019 · npmjs.com · its alternatives →

20. 20
    CryptoHack – a fun platform for learning cryptography▲20

    A free, fun platform to learn about cryptography through solving challenges and cracking insecure code. Can you reach the top of the leaderboard?

    2020 · cryptohack.org · its alternatives →

21. 21
    Open-Source Shamir Secret Sharing Library in Go▲14

    A zero dependency implementation of Shamir Secret Sharing in pure Go - GitHub - openfort-xyz/shamir-secret-sharing-go: A zero dependency implementation of Shamir Secret Sharing in pure Go

    2024 · github.com · its alternatives →

22. 22
    Pgsodium – A Crytographic PostgreSQL Extension▲7

    Modern cryptography for PostgreSQL using libsodium. - michelp/pgsodium

    2022 · github.com · its alternatives →

23. 23
    GDH – Generalized Diffie-Hellman key exchange Java implementation▲8

    Generalized Diffie-Hellman key exchange Java library built on top of the Vert.x framework - maxamel/GDH

    2017 · github.com · its alternatives →

24. 24
    NuFHE: A GPU implementation of fully homomorphic encryption in Python▲8

    NuCypher fully homomorphic encryption (NuFHE) library implemented in Python - nucypher/nufhe

    2018 · github.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →