alt.hn

2/19/2026 at 11:54:21 AM

Show HN: Mini-Diarium - An encrypted, local, cross-platform journaling app

 https://github.com/fjrevoredo/mini-diarium

by holyknight

2/19/2026 at 12:28:33 PM

This is Nice.

However, how do one access their diary, when you stopped maintaining it? Is this targeted more at the technically inclined, high-profile people who need to keep secrets?

Personally, I believe that for something like a diary/journal, it should be in a format easily readable by most tools (so a Plain-Text or a MarkDown at best), then it is in a container/folder. Now, encrypt that container/folder instead. In the future, when you need to change the tool for Encryption/Decryption, move the container/folder.

For instance, tools such as https://cryptomator.org comes to mind.

by Brajeshwar

2/19/2026 at 12:40:10 PM

I think there are two different concerns mixed together:

1) Can I still read my data in 10 years? That’s mostly about open, well-documented formats + an export path. A journaling app can still be “safe” here if it can export to Markdown/plain-text (or at least JSON) and the on-disk schema is documented.

2) Can I decrypt it in 10 years? That’s about using boring primitives (AES-GCM, Argon2/scrypt/PBKDF2) and keeping the crypto layer simple. If it’s standard crypto, you’re not locked to one vendor the way you might be with a bespoke format.

The “plain files in an encrypted folder” approach (Cryptomator/VeraCrypt) is totally reasonable—and arguably the simplest threat model—but you do give up a lot of what makes a journal app nice (full-text search, tags, structured metadata, conflict handling, etc.). SQLite + client-side encryption is a fine compromise if there’s a solid export and the KDF/password story is strong.

The biggest real risk is still: losing the password. A printable recovery key / key export would help more than switching formats.

by TheFlya7c

2/19/2026 at 12:56:19 PM

Make the journal app store its data in plain-text Markdown files in an encrypted folder (or ZIP).

If necessary for things like search, add a cache file to the folder.

by armchairhacker

2/19/2026 at 3:08:16 PM

When I had a Mac I used an encrypted volume in Dropbox. (Not sure if that's a good idea, but I didn't have any issues.)

I used Notational Velocity in those days :) A rare gem of ergonomics.

Later I did the same thing with a VeraCrypt volume.

Now I'm in Obsidian, which has its own encryption (if you trust 'em!), but never quite got the frictionless feeling of NV back.

by andai

2/19/2026 at 1:15:52 PM

yeah, currently you can export your journal to json or markdown files. So you can walk away at any point. Vendor lock-in is one of the main things i wanted to avoid. That's why I sticked with boring and standard libraries and encryption as much as possible. Thanks for the feedback!

by holyknight

2/19/2026 at 7:49:41 PM

You could store the encrypted contents in an IPFS collection or just use old DHT. Obviously someone else needs to access the content to keep it fresh (even if they don't have the ability to decrypt it), but considering it's markdown you could run an "official" seeder that seeds everything or just have each client run an IPFS node etc.

by ddtaylor

2/19/2026 at 8:50:08 PM

That's definitely an interesting idea

by holyknight

2/19/2026 at 12:22:07 PM

I love the minimalism of the UI.

Here's a tip: GitHub now allows you to embed a proper video in your README. (https://stackoverflow.com/questions/4279611/how-to-embed-a-v...). Quality would be much better, and people can navigate back-and-forth in the video.

by kantord

2/19/2026 at 1:38:15 PM

No more fighting with gifs for README files. Thanks!

by 8-prime

2/19/2026 at 1:16:04 PM

Thanks! I will check that out

by holyknight

2/19/2026 at 5:25:20 PM

I like the idea, as a niche project for users that don't have control over their hardware/OS, or run on USB flash for portability.

Speaking of which, I have notes / journal entries dating back several decades, all in plain text files. I'm worried about these new projects and their longevity and whether it'll be actively supported 30 years from now. For simplicity, I'd use gocryptfs, Veracrypt, or other general file-based encryption which suits your risk tolerance, and use whatever editor (ie Obsidian, vscode, OneNote, etc) I want to use.

by otterpro

2/19/2026 at 3:58:38 PM

There already is another, unrelated "Diarium" journaling app: https://diariumapp.com

It's a paid app, not open source, but I've been using it for years and it has been working very well for me.

by 8x

2/19/2026 at 12:36:02 PM

Dann, that’s a fancy README.md , love it

by khalic

2/19/2026 at 1:26:02 PM

thanks!

by holyknight

2/19/2026 at 12:20:35 PM

Looks really cool, I like the pretty but minimalist interface. Could I store the SQlite file on, say, google drive so that I could access my journal from different devices while the contents are still kept secure because they’re encrypted?

by spangry

2/19/2026 at 1:33:51 PM

Yes, you can definetely can! Currently you can see the location of the .db file on the preferences while your journal is open.

I will improve the experience for this use case in follow up releases, by for example being able to define a arbitrary path for your db file.

Thanks for the feedback!

by holyknight

2/19/2026 at 12:40:49 PM

The biggest problem is that this is not available on mobile platforms. Most people do this on their phones, not their laptops.

by g947o

2/19/2026 at 1:28:46 PM

The support for it is planned. It was thought from the beginning with supporting all the major platforms; I just started with the desktop support because there was my best use case. But the support is already planned in the near future. Android will follow shortly, and an iOS version can be done if there is demand for it. Thanks!

by holyknight

2/19/2026 at 9:12:19 PM

key reuse, and probably other issues in a homebrew cryptosystem that wraps AES.

is there a reason we aren’t using high level crypto libraries in 2026?

by sneak

2/19/2026 at 9:31:45 PM

Thanks for the feedback. This is why I built it FOSS.

On the libraries: Mini Diarium actually does use established, widely audited crates rather than rolling its own primitives. See https://github.com/RustCrypto/AEADs for AES-256-GCM, https://github.com/RustCrypto/password-hashes for key derivation, and https://github.com/dalek-cryptography/curve25519-dalek + https://github.com/RustCrypto/KDFs for the key file ECIES scheme. The thin cipher.rs wrapper just handles nonce prepending with no custom crypto primitives.

On key reuse: the master key is intentionally shared across entries (as in Signal, 1Password, etc.), but each encrypt() call generates a fresh 96-bit nonce from the OS CSPRNG, so the (key, nonce) pair is never repeated.

That said, I am not a security expert by any means. If you've spotted something concrete, a specific call site, a protocol flaw, or a library you'd swap in, I'd genuinely love to hear it. Open to PRs or a discussion issue.

Regards

by holyknight

2/19/2026 at 1:38:15 PM

looks sleek, fast, and stays true to the privacy-first roots we all loved. Awesome job modernizing a classic without losing its soul.

by sanarg

2/19/2026 at 1:23:41 PM

I'm using obsidian and cryfs. Nothing has access to those except a few programs. I'm storing notes, files, documents, whatever is important and everything is synced to the cloud.

by CafeRacer

2/19/2026 at 1:30:25 PM

This is the beauty of it. If it works for you it's great. If this new app works for others, then it's great.

That's a good win-win situation.

As a fellow obsidian user, I wouldn't scoff at a simple app which does one thing well.

by bayindirh

2/19/2026 at 1:55:52 PM

I also, myself, had a similar setup some time ago; that's super valid.

by holyknight

2/19/2026 at 12:41:09 PM

Here's another approach using Rclone and an editor of your choice. Rclone has a built in crypt library that can encrypt your data and store it in a cloud provider. I use it along with Sublime Text to journal, and store my encrypted data on Dropbox.

More here: https://alabhya.me/rclone

by alabhyajindal

2/19/2026 at 4:15:06 PM

Thank you for sharing this, this is very interesting problem to tackle.

I find this interesting mostly to understand how you are handling encryption and security. I think this is one approach but others expressed concern over long term viability.

Using Tauri is also very interesting. How did you find using it for this simpler case?

Anyhow, very cool project. Don't aband it :)

by desireco42

2/19/2026 at 2:11:59 PM

You can just encrypt your partition and use a file editor.

by goodpoint

2/19/2026 at 2:17:08 PM

you can certainly do that, indeed.

by holyknight

2/19/2026 at 1:46:11 PM

How are we pronouncing that name?

by drcongo

2/19/2026 at 1:54:33 PM

It's based on a latin word so it should be not that far from the english pronunciation. It would be something like MIN-ee Dee-AIR-ee-um

by holyknight

2/19/2026 at 12:40:00 PM

Obsidian.md

by october8140

2/19/2026 at 1:44:33 PM

yes, that's definitely also a valid approach.

by holyknight

2/19/2026 at 12:43:06 PM

One major problem, I don't want a journal with unbreakable encryption where I lose all my data if I ever lose the key.

I already pay for a journaling website where I know I can always recover my journals as long as I have access to my Gmail.

So, while I appreciate this security first mindset, for me it actually becomes less interesting. I want my journal to sync to the cloud, I want to be able to unlock it, I don't want to risk losing years of journals if I forget a single key.

by saberience

2/19/2026 at 1:34:56 PM

>as long as I have access to my Gmail

I think you should be more cautious about relying on the services of a company like Google that can arbitrarily decide to remove your account data or access. Similar, though the person was fortunate enough to regain access: https://hey.paris/posts/appleid/

You can mitigate hardware failure and data loss, especially for a simple key, but you may not be able to prevent Google from deciding your account is gone one day.

by duskdozer

2/19/2026 at 1:19:59 PM

Thanks for the feedback! That point is super valid; that's why I created it with multiple authentication slots in mind (currently, it supports both password and public key authentication) so you can use multiple simultaneously and do not need to rely on one single point of failure.

For example, if you set up a password and a key, you can use your key, and if it gets lost or compromised, you can still log in with the password, remove the old key, and generate a new one.

You can do the same in reverse: just use the password and keep the key in a safe place (like a password manager or a physical USB), and if you lose your password, you can still get access with the key.

Thanks again!

by holyknight

2/19/2026 at 12:31:24 PM

Nice project. The SQLite-on-cloud-drive approach mentioned in another comment is actually pretty solid — if the encryption is done client-side before the file hits the cloud, it doesn't matter where it's stored. The key thing is making sure the key derivation is robust enough that a compromised cloud account doesn't compromise journal contents.

One thing I'd push back on regarding the "what if you stop maintaining it" concern: SQLite with AES-256-GCM is about as future-proof as you can get. Both are standards with multiple implementations. The real risk isn't the format dying — it's losing the password. A recovery key export (even just a paper backup of the key material) would go a long way.

For the cross-device case, you might also consider something like Syncthing for sync without any cloud intermediary. Keeps the threat model simpler.

by cranberryturkey

2/19/2026 at 12:41:30 PM

Let alone the cloud, SQLite in iCloud Drive is the reason I am not using Bear notes app. After losing to convoluted file formats a couple of times I do not consider any journal or notes app that doesn’t let me see/edit plain text files on the disk. I will deal with encryption, storage, etc on my own. Those are too personal files to be either locked or go behind any amount of friction. I still have tons of files locked from Dyrii that was abandoned

by crossroadsguy

2/19/2026 at 1:25:32 PM

Hey, thanks for the feedback! Yes, currently in the preferences you can see the path of your local SQLite DB file, so you could definitely sync that to the cloud.

I will improve it further in next releases to make it even simpler (for example, by defining a custom path for the store, which cannot be done currently), but it can definitely be done already.

Regarding the key for recovery: you can already do it. Mini-Diarium already supports both password and public key authentication. So you can use the password and generate the .key file and keep it in a secure place as a backup in case you forget your password (or do it in reverse: use the key file and have the password as a backup).

Thanks again!

by holyknight

2/19/2026 at 2:22:18 PM

for aem

by giahug

2/19/2026 at 9:08:35 PM

[dead]

by artzev_

2/19/2026 at 1:32:13 PM

[flagged]

by cranberryturkey

2/19/2026 at 1:36:01 PM

This site is not for bots, go away please.

by isodev

2/19/2026 at 1:19:53 PM

> Every entry is encrypted with AES-256-GCM before it touches disk

Until the OS needs more memory and swaps your secrets out.

by hackingonempty

2/19/2026 at 7:31:34 PM

The "before it touches disk" thing in the promo copy is silly, yes, but there's really no sane threat model for this; from every vantage point where this could matter, you already have game-over attacks on the app.

by tptacek

2/19/2026 at 1:23:36 PM

Protected memory can be used to fix that. Working on a related project that I'm planning to share soon.

by mhluongo

2/19/2026 at 1:31:23 PM

But so what? Another app can't really read swap file/partition. Unless it runs with elevated privileges like root, in which case the system is compromised anyway.

by mystifyingpoi

2/19/2026 at 1:42:03 PM

Hey, thanks for the feedback! That's a valid point; currently, my main focus is to secure the store on disk, but this is definitely a point which could be improved later on.

If your machine is fully compromised or actively monitored by a threat actor with physical access, then this tool would not cover you, that's for sure.

If you have any concrete recommendations, I can even give it a try in one of the next releases.

Thanks!

by holyknight

2/19/2026 at 1:23:44 PM

I thought we were all supposed to be encrypting our swap. Or is there something better an app can do about this?

by plagiarist

2/19/2026 at 1:39:23 PM

We're all supposed to be encrypting our storage too but this tool advertises that it encrypts your secrets before they hit the disk.

All of the supported operating systems have memory locking functions that prevent swapping out but they are not used in this tool, AFAIK. Also, they are intended to lock things like secret keys that are small and not displayed to the user in a GUI. You can lock the whole process though but a big web browser process is going to significantly up the amount of unswappable memory. Stuff sent to the windowing system may get swapped out too.

by hackingonempty