atoponce

Cryptography, not cryptocurrency

Books

• Handbook of Applied Cryptography
• Serious Cryptography: A Practical Introduction to Modern Encryption
• Cryptography Engineering: Design Principles and Practical Applications

Resources

• Cryptopals Challenges
• CryptoHack Challenges

atoponce

Magic Hashes

Motivations

Calculating magic hashes for https://www.whitehatsec.com/blog/magic-hashes/. These strings should probably be put into a blacklist preventing users from using them as passwords to mitigate PHP evaluating hashes starting with "0e" as floats.

Probabilities

atoponce

Strongly Recommended

Disable DCC

/plugin unload xfer
/set weechat.plugin.autoload *,!xfer

Disable CTCP

/set irc.ctcp.action ""
/set irc.ctcp.clientinfo ""
/set irc.ctcp.finger ""

/set irc.ctcp.ping ""

atoponce

#!/usr/bin/python

import hashlib

nonce = 0
key = 'f3q4uszyt67cfatq'
pad = hashlib.sha256(str(nonce)+key).digest()

# encrypt
plaintext = 'the quick brown fox jumped over.'

atoponce

Each generator yields 128-bit security passwords. Each generator can take an optional numeric password to generate that many passwords. They should be placed in your ~/.zshrc. They are not portable across other shells.

gen-monkey-pass generates visually unambiguous random meaningless strings using Crockford's base32. Requires only ZSH:

% gen-monkey-pass 
9cws91tjck93f0xymjn33cjt7m

% gen-monkey-pass 3

atoponce

Creating a BIP39 mnemonic 100% by hand (almost)

This document shows how we can create Bitcoin wallet mnemonic seeds by hand in a provably secure way. It follows the BIP-39 specification. The steps are straight forward, and we'll go into each of them in detail with this doc.

The steps are as follows:

• Generate cryptographically secure bits
• Divide into 11-bit bytes

atoponce

10,000 seconds RE:

Zone	HR	RE	Ratio
1	80	15	0.0015
1	85	17	0.0017
1	90	19	0.0019
1	95	22	0.0022
1	100	24	0.0024
1	105	26	0.0026

atoponce

First column is HR, second column is RE for 10,000 seconds at that HR.
Header is formula from the lowest HR to the max HR in that segment wihout the intermediate points.
There are 7 separate jumps.

8x/15-83/3
==========
80: 15
85: 17
90: 19
95: 22

atoponce

• December 1974
  • Asmussen, Erling, and Flemming Bonde-Petersen
  • "Apparent Efficiency and Storage of Elastic Energy in Human Muscles during Exercise"
  • https://doi.org/10.1111/j.1748-1716.1974.tb05776.x
• June 1, 1977
  • Cavagna, G. A., and M. Kaneko
  • “Mechanical work and efficiency in level walking and running.”
  • https://doi.org/10.1113/jphysiol.1977.sp011866
• November 1, 1982
• Williams, Keith R., and Peter R. Cavanagh

atoponce

test_name	ntup	OptiHash	SHA-256	urandom
diehard_birthdays	0	🟥	🟢	🟢
diehard_operm5	0	🟥	🟥	🟥
diehard_rank_32x32	0	🟥	🟥	🟥
diehard_rank_6x8	0	🟥	🟥	🟥
diehard_bitstream	0	🟥	🟥	🟥
diehard_opso	0	🟥	🟥	🟥
diehard_oqso	0	🟥	🟥	🟥
diehard_dna	0	🟥	🟢	🟥