SAPikachu

Idea: Verifiably non-riggable shuffle algorithm for online mahjong games

1. Server should save a random bytestring PS (regenerated after each full match) for each player. PS should be visible on game UI.
2. Server should publish a global 1024-bit (128 bytes) random bytestring GS (changed every X minutes). Current and next GS should be visible on game UI.
3. When a match starts, save timestamp T1.
4. When a round starts, save timestamp T2, and generate a random bytestring R. Then, generate random seed for this round by calculating SHA512 hash of concatenation of following elements (|| denotes concatenation):

• T1
• T2
• R
• HMAC-SHA512(GS, T1 || T2 || R)

SAPikachu

Environment

• Ubuntu 20.04
• Kernel 5.4.0-67
• OpenZFS 2.0.4-0york2~20.04
• ashift: 12
• Compression: zstd, default level

Data

SAPikachu

Keybase proof

I hereby claim:

• I am sapikachu on github.
• I am sapikachu (https://keybase.io/sapikachu) on keybase.
• I have a public key ASCDs5kwFA8KZaR-ExqujHIKUUlxW1-IptukK3hxoOIM9Ao

To claim this, I am signing this object:

SAPikachu

"use strict";
(function() {

Error.stackTraceLimit = Infinity;

var $global, $module;
if (typeof window !== "undefined") { /* web page */
  $global = window;
} else if (typeof self !== "undefined") { /* web worker */
  $global = self;

SAPikachu

diff --git a/include/netfilter.mk b/include/netfilter.mk
index 5d532ce..474a48b 100644
--- a/include/netfilter.mk
+++ b/include/netfilter.mk
@@ -262,6 +262,9 @@ $(eval $(call nf_add,IPT_TPROXY,CONFIG_NETFILTER_XT_TARGET_TPROXY, $(P_XT)xt_TPR
 # led
 $(eval $(call nf_add,IPT_LED,CONFIG_NETFILTER_XT_TARGET_LED, $(P_XT)xt_LED))
 
+# tcpoptstrip
+$(eval $(call nf_add,IPT_TCPOPTSTRIP,CONFIG_NETFILTER_XT_TARGET_TCPOPTSTRIP, $(P_XT)xt_TCPOPTSTRIP))

SAPikachu

#!/usr/bin/env python3

import os
import time
import math
from queue import Queue, Empty
from threading import Thread
import logging

from influxdb import InfluxDBClient

SAPikachu

#!/bin/sh

# /jffs/scripts/firewall-start

# A VM in VLAN 1111 (tagged) is plugged to port 1, it will act as router of guest network, offer DHCP, and do other filtering as necessary
# Port 5 (internal CPU port) has to be included to make it works
robocfg vlan 1111 ports "1t 5t"

# Bring up VLAN interface
ip link add link eth0 name vlan1111 type vlan id 1111

SAPikachu

#!/usr/bin/env python3

import requests

# sapikachu@gmail.com is the organizer, calendar@sapikachu.net is controlled by our app and wants to update the event
# Message body is modified from the mail sent by Google Calendar

body = """Date: Fri, 17 Jul 2015 13:23:53 +0000
Subject: Updated: RFC2446 Test @ Tue Jul 21, 2015 5pm - 6pm (i@sapikachu.net)
From: calendar@sapikachu.net

SAPikachu

sapikachu@sapikachu-netbox:/tmp/memtest$ ./bench.sh 
blowfish-cbc
Bytes per second: sent 42984714.6, received 7850.0
Bytes per second: sent 42957622.1, received 7874.5
Bytes per second: sent 43907095.0, received 8061.9
aes128-ctr
Bytes per second: sent 57376736.6, received 10429.3
Bytes per second: sent 57130993.1, received 10765.5
Bytes per second: sent 60852877.9, received 11334.7
aes192-ctr

SAPikachu

# User authentication method. Could be set multiple times and in that case
# all should succeed.
# Options: certificate, pam. 
auth = "certificate"
#auth = "plain[passwd]"
#auth = "pam"

# The plain option requires specifying a password file which contains
# entries of the following format.
# "username:groupname:encoded-password"