How to check the RSA p,q,N,phi_N,e,d

As we know the RSA certificates

we will choose two primes p,q
N=p*q
phi_N = (p-1)*(q-1)
Then choose e, e.g. 65537
Then calculate the d, e*d % phi_N = 1
Then we have the public key (e, N), private key

…

Square and Multiply

在密码学中经常看到a^b mod n运算，当b很大的时候，就不能够按照简单的数学运算进行了。

“Square and Multiply”就是一种窍门。

把指数转换成2进制，从左到右开始计算

当指数二进制为1时 z^2*a mod n
当指数二进制为0时 z^2 mod n

其中z为上一个指数二进制计算结果(从左到右)，初始为1

举例a^b mod 21 = 3^11 mod 21 = 3^1011 mod 21

z = 1
z = z^2*a = 1^2 * 3 mod 21 =

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Install DSM 7.2 (DS 918+) on J3455(暴风二期)

Refer the document

https://divineengine.net/article/installing-synology-dsm-7-with-automated-redpill-loader/

Download arpl-i18n

https://github.com/RROrg/rr/releases

Download balenaEtcher used to flash the rr.img on the USB disk

https://etcher.balena.io/#download-etcher

Build the loader

Then boot the USB disk, and open in browser

http://192.168.1.3:7681/

We can do

Set the command line with

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hashcat crack sha256 with rockyou.txt

cat sha256_hash_rockyou.txt 
F09EDCB1FCEFC6DFB23DC3505A882655FF77375ED8AA2D1C13F640FCCC2D0C85
hashcat -m 1400 -a 0 sha256_hash_rockyou.txt ~/rockyou/rockyou.txt
hashcat -m 1400 --show sha256_hash_rockyou.txt
f09edcb1fcefc6dfb23dc3505a882655ff77375ed8aa2d1c13f640fccc2d0c85:paule

hashcat crack brcypt with rockyou.txt

It’s slow, so just crack the 1. 4 letter word 2. 4 litter letter.…

nmap & Linux Process Analysis

I have begun learning security skills on the TryHackMe website and have completed two rooms. In my opinion, it is the best site for acquiring and practicing security skills so far.

Nmap Live Host Discovery
Linux Process Analysis

And several …

SAP AI Core 接入Cursor

估计这是全网第一篇把SAP AI Core 接入Cursor 的教程。

教程很简单，按照下面项目README，跑一个本地AI Core LLM 代理服务器

https://github.com/pjq/sap-ai-core-llm-proxy

http://127.0.0.1:5000

接着找一台有公网IP的电脑，注册绑定好域名，在Nginx设置好反向代理

比如 https://ai-proxy

然后在Cursor 设置自定义Open AI URL

https://ai-proxy/v1

这个代理服务器是手工搓的，目前支持gpt-4,gpt-4o, Claude 3.5 sonnet 统一了OpenAI API协议，所以可以用到任何兼容OpenAI API 的客户端。

至此，Token自由。

SAP AI Core LLM Proxy 介绍

sap-ai-core-llm-proxy is …

Heart bleed testing with nmap or msfconsole

nmap

sudo nmap --script vuln -p443 host
sudo nmap -sV --script=ssl-heartbleed host

msfconsole

msfconsole 
search heartbleed
use auxiliary/scanner/ssl/openssl_heartbleed
options
set RHOSTS xx.xx.xx.xx
set VERBOSE true
exploit
run

…

iptables

opkg update
opkg install coreutils-nohup bash iptables dnsmasq-full curl ca-certificates ipset ip-full iptables-mod-tproxy iptables-mod-extra libcap libcap-bin ruby ruby-yaml kmod-tun kmod-inet-diag unzip luci-compat luci luci-base

nftables

opkg update
opkg install coreutils-nohup bash dnsmasq-full curl ca-certificates ipset ip-full libcap libcap-bin ruby …

群晖双网口OpenWRT软路由设置

家里的黑群之前用OpenWRT做软路由的时候买过一个网卡，最近把黑群升级到了最新版本，软路由虽然一直没用，但还是把它设置起来以备不时之需。

所以现在有两个网卡

LAN 1(Default)
LAN 2(新加的)

在Virtual Machine Manger里增加两个网卡

eth0 -LAN 2(新加的)
eth1 -LAN 1(Default)

在Virtual Machine-OpenWrt这个虚拟机上加入上面新增的两个网卡，这样就等于在 OpenWrt里插入了两个网卡eth0, eth1

接下来在OpenWRT里面分别设置eth0(LAN2,新加的)作为局域网， eth1(LAN1,Default)作为外网连接，设置网关为家里路由器的ip, 内部局域网段为192.168.2.xxx

eth0-lan(内网)
eth1-wan(外网)

cat /etc/config/network
/etc/init.d/network restart

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