The specification https://eris.codeberg.page/spec/#name-introduction was mentioned on the plan 9 mailing list https://marc.info/?l=9fans&m=176805933123451&w=2.
ERIS allows you to make content available robustly over computer networks by using identifiers that are location independent and network-optimized. It can be used as a building block for decentralized and fault-tolerant applications, some examples being:
- file-sharing
- de-duplication of content
- reproducible and deterministic identifiers of content
ERIS is a network optimized form of content-addressing.

"Keepass2Android (K2A) is an open souse [sic] port of the excellent KeePass password manager for Windows to the Android platform."
I just read on https://github.com/android-password-store/Android-Password-Store/discussions/3260 that the password store application has been archived, i.e. development has stopped.

Interesting book by Paul C. van Oorschot, recommended by Rik Farrow on the TUHS mailing list https://www.tuhs.org/pipermail/tuhs/2025-May/031832.html

One of many interesting articles. See https://xeiaso.net/blog/2024/homelab-v2/, https://xeiaso.net/blog/idk-about-email/, https://xeiaso.net/blog/push-2fa-considered-harmful/ for others.
On https://xeiaso.net/blog/move-away-rsa-ssh/, it is stated that "[it is] likely you can break 2048-bit RSA (the most widely deployed keysize) with a quantum computer that only uses 372 qubits of computational power. The IBM Osprey has 433 qubits."
https://12factor.net/ sounds interesting too.

Found on https://en.wikipedia.org/wiki/Substack and https://en.wikipedia.org/wiki/Molly_White_(writer)

Enchive is a tool to encrypt files to yourself for long-term archival. It's a focused, simple alternative to more complex solutions such as GnuPG or encrypted filesystems. Enchive has no external dependencies and is trivial to build for local use. Portability is emphasized over performance.

Supported platforms: Linux, BSD, macOS, Windows

The name is a portmanteau of "encrypt" and "archive," pronounced en'kīv.

Files are secured with ChaCha20, Curve25519, and HMAC-SHA256.

Key pairs can be derived from a pass phrase.  See https://github.com/skeeto/passphrase2pgp for a tool to generate gpg key pairs in a similar way.

OpenSK https://github.com/google/OpenSK released by Google is a fully open-source implementation for security keys written in Rust that supports both FIDO U2F and FIDO2 standards.

OpenSK is based on the FIDO2 specifications, which combine the World Wide Web Consortium’s (W3C) Web Authentication (WebAuthn) specification and FIDO Alliance’s corresponding Client-to-Authenticator Protocol (CTAP).

The nRF52840 MDK USB Dongle works well with OpenSK. Taking advantage of the UF2 Bootloader, you can easily program the OpenSK by just copying the .uf2-format image to the flash drive.

The Explicit-Formulas Database [for elliptic curves] is joint work by Daniel J. Bernstein and Tanja Lange, building on work by many authors.

SC4 is a secure communications system specifically designed for (relatively) easy auditability by way of a ruthless commitment to simplicity. SC4 provides the functional equivalent of PGP from the end-user's point of view, but implements it in two order of magnitude less code. The cryptographic core of SC4 is Daniel J. Bernstein's TweetNaCl library (<800 LOC). On top of this we have a variety of UI implementations ranging from 1000 to 5000 LOC. One of these has completed a formal audit to date.
On 2026-01-09, the site could not be reached.

OpenSSL software - a robust, commercial-grade, full-featured toolkit for general-purpose cryptography and secure communication.