hashbrowncipher

Scientific American
May 1973
Volume 228
Number 5

Cryptography and Computer Privacy
by Horst Fiestel

Computer systems in general and personal "data banks" in particular
need protection. This can be achieved by enciphering all material and authenticating

hashbrowncipher

/*
 * A little x86-64 loader for Linux's binfmt_misc.
 *
 * Compile with: gcc -O3 -static -nostdlib -o loader loader.c
 *
 * Register as:
 *   mount -t binfmt_misc none /proc/sys/fs/binfmt_misc
 *   echo ':amd64:E::amd64::/path/to/loader:O' > /proc/sys/fs/binfmt_misc/register
 *
 * Then just run your favorite shellcode. Sample:

hashbrowncipher

Moving from running to port closed took: 3.147979 s
Moving from port closed to port open took: 0.000000 s
Moving from running to port closed took: 2.366330 s
Moving from port closed to port open took: 0.000000 s
Moving from running to port closed took: 2.998677 s
Moving from port closed to port open took: 0.000000 s
Moving from running to port closed took: 2.605815 s
Moving from port closed to port open took: 0.024404 s
Moving from running to port closed took: 2.754971 s
Moving from port closed to port open took: 0.009866 s

hashbrowncipher

- this uses a squashfs root image with a writable overlay
- only a single application service is running (sshd)
- the instance was a c5.large that had already booted once

hashbrowncipher

- This run was on a c5.large which had been booted up before
- Set MODULES=dep in /etc/initramfs-tools/initramfs.conf
- Deleted a bunch of initramfs-tools hooks, including especially: iscsi mdadm lvm2
- Removed a bunch of stock ubuntu services
  * snapd
  * ec2-instance-connect
  * cryptsetup-initramfs
  * udisks2
  * unattended-upgrades
  * plymouth

hashbrowncipher

josh@ubuntu:~/hasher$ dd if=/dev/zero bs=65536 count=16384 | ./xxHash/xxh128sum 
16384+0 records in
16384+0 records out
16024760318c6298efd1151033ad2e9f  stdin
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.23966 s, 4.5 GB/s
josh@ubuntu:~/hasher$ dd if=/dev/zero bs=65536 count=16384 | ./a.out 
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.210685 s, 5.1 GB/s
16024760318c6298efd1151033ad2e9f

hashbrowncipher

from aiohttp.client_exceptions import ClientError
import asyncio
from asyncio import Queue
from aiohttp.resolver import AsyncResolver
import json
import os
import random
from blake3 import blake3
from hashlib import md5
from socket import socketpair

hashbrowncipher

from botocore.session import Session

credentials_cache = dict()

class Session(Session):
    def __init__(self, role_arn, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._config = dict(
            profiles=dict(
                default=dict(

hashbrowncipher

#!/bin/bash
# Depends on zstd (>1.3.6) and aws-cli
set -o errexit
set -o nounset
set -o pipefail

# Set kernel.core_pattern = | coredump_uploader.sh %P %s %E
PID=$1
shift
SIGNAL=$1

hashbrowncipher

$ sudo -u cassandra jstat -gcutil $(pgrep -f Cassandra) 100ms
S0     S1     E      O      M     CCS    YGC     YGCT    FGC    FGCT     GCT
0.00 100.00 100.00 100.00  97.96  95.10     21    8.678    11  140.498  149.176
0.00 100.00 100.00 100.00  97.96  95.10     21    8.678    11  140.498  149.176
0.00 100.00 100.00 100.00  97.96  95.10     21    8.678    11  140.498  149.176