Isithran

@gensokyo

#HamRadio operator (mainly packet data, microwave links, #hamnet), λ＜40m. High energy physics, timekeeping and unrelated stuff. She/Her 🏳️‍⚧️ - 35

417 Siguiendo352 Seguidores912 Publicaciones

YouTube Bluesky

¿Es tu perfil?Reclámalo y gensokyo.dirty.social es tuyo.Reclamar perfil

Isithran@gensokyo· 5d

I'm now able to build trees to share an encryption key to a set of authorized devices (if you know the AACS scheme, it's the part that's used to derive the processing key in a media key block). Blog article coming when it's done™

A test program that prints the number of revoked nodes within a tree, and the emitted subset-difference entries for each tree.

A picture of a toy tree of depth 5 and a list of revoked devices, alongside their assigned their revoked keys, to check if none of the assigned keys can covered the subset-difference records.

Isithran@gensokyo· 17d

Cadeau, @sergezaka.bsky.social , secteur sud Pilat.

Isithran@gensokyo· 19d

Kinda concerned, ngl

"avoid transmitting cleartext" passwords over the air

Isithran@gensokyo· 20d

Fops? In my computer? 🦊

A screenshot of a C source file with the following line:
#include "fops.h"

Isithran@gensokyo· 27d

MFW I found out Boing99 posted them in... 2007 in the "usual" place...

Isithran@gensokyo· 27d

Huge shoutout to OxideAV for publishing the X and Y parameters that were missing 💜

A screenshot of a custom-made program that depicts successful signature validation of MKBv3's Host and Drive revocation list.

Isithran@gensokyo· Jun 18

Today, I've had fun with Hookpad, to decipher a key change that messed with my brain in "Inori" from Fujikawa Chiai. Might share it on Theorytab in two weeks, my profile is too young to submit entries... For the record, the section of interest is @2:49 in this video: www.youtube.com/watch?v=3l4Y...

Screenshot of Hookpad music composition software showing the song 'Inori' by Chiai Fujikawa in D♭ major. The view displays Chorus, Bridge, and Verse 2 sections, each with a piano-roll melody and a row of Roman-numeral chord symbols. A side panel shows voice and display settings, and a bottom bar has audio playback controls.

Isithran@gensokyo· Jun 14

Isithran@gensokyo· Jun 11

Today in the mail 😺　　✉️💨

ただ美い呪い - Nakamura Hak (CTCM 65137)
Front cover

ただ美い呪い - Nakamura Hak (CTCM 65137)
Back cover

Perfume ZO/Z5 Anniversary "Nebula Romance" Complete Edition (UPXP-1018)
Front cover

Perfume ZO/Z5 Anniversary "Nebula Romance" Complete Edition (UPXP-1018)
Back cover with content:
DISC 1: Perfume 10th Tour ZOZ5 “ネビュラロマンス Episode 1
DISC 2: Perfume ZO/Z5 Anniversary "ネビュラロマンス” Episode TOKYO DOME
DISC 3: 特典映像

Isithran@gensokyo· Apr 30

Digipak inner cover art.
An illustration of Ranka, Alto and Sheryl.

Pre order bonus: an All-Access backstage pass with a lanyard to the colors of Ranka and Sheryl.

Back of the pre-order bonus backstage pass, which depicts Sheryl Nome dresses as Magical Girl

Isithran@gensokyo· Apr 30

Isithran@gensokyo· Apr 30

Today in the mail 💜

Macross F Galaxy Live ✩ Final 2025
ヤックデカルチャー特装盤　(VTZL-266)
Album, front cover of the box

A pair of tape straps with the color theme of Sheryl Nome and Ranka Lee

Sheryl Nome and Ranka Lee's signed comment at the bottom of the box.

Sheryl's comment is これからも… あたしたちの歌をきけええ！！！

Ranka's comment is 2059年を目指して
一緒に駆け抜けましょう~♡♡

Isithran@gensokyo· Apr 8

Isithran@gensokyo· Apr 7

Telephoto shot of Grande Moucherolle, 250mm, f/32

Isithran@gensokyo· Mar 14

🦊🏠 (Found in St Pierre et Miquelon)

Satellite view of a house that conveniently looks like a fox face

Isithran@gensokyo· Feb 27

Birb

Eurasian collared dove, sitting on a power line.
Canon eos 300d, 55-250mm zoom

Isithran@gensokyo· Jan 30

Having a dissector for a protocol which spec is not yet completed, nor public: check.

AX.25 Authentication Header

## Status of this Memo
This document specifies an Amateur Radio protocol, and requests discussion and suggestions for improvements. Distribution of this memo is unlimited.

## Copyright Notice

Copyright (C) 2026 Célestine Gramaize F4HOF

## Introduction

The AX.25 Authentication Header (AX.AH) is used to provide connectionless integrity and data origin authentication for AX.25 datagram (hereafter referred to as just "authentication"), and to provide protection the default calls for the sender to increment the Sequence Number against replays. AX.AH provides authentication for as much of the AX.25 header as possible, as well as for upper level protocol data. However, some AX.25 header fields may change in transit and the value of these fields, when the packet arrives at the receiver, may not be predictable by the sender. The values of such fields cannot be protected by AX.AH.

The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this document, are to be interpreted as described in [RFC 2119}(https://datatracker.ietf.org/doc/html/rfc2119).

Security services can be provided between a pair of communicating hosts, between a pair of communicating security gateways, or between a security gateway and a host.

A Wireshark screenshot depicting an AX.25 capture in which an AXSec packet is selected.

Isithran@gensokyo· Jan 19

Isithran@gensokyo· Jan 13

Today in the mail たみうた。- 民安ともえ (SRIN-1039)

Isithran@gensokyo· Dec 22

Screenshot of Sousou no Frieren, ep 08 @18:18
The subtitle shows Linie telling "Lord Lügner, a rat."

Isithran@gensokyo· Dec 12

Yesterday in a nutshell: - "I should work on $thing_i_ll_showcase_in_march_26." Worked on bootable superformatted floppies to give more headroom to a single-floppy linux. github.com/w84death/flo...