5 dollar wrench attack

5 dollar wrench attack

Ongeacht of je bitcoin en cryptocurrencies bezit of niet, dit zou in de eerste plaats een prioriteit moeten zijn. Verbeter je huisbeveiliging door sloten aan je deuren toe te voegen en ze gewoon altijd te vergrendelen, een vuurwapen te kopen (indien legaal), een loyale en betrouwbare hond te adopteren, beveiligingscamera’s en bewegingssensoren op te zetten, of beter nog, een vuurwapen te kopen en leer hoe je het kunt gebruiken.

4. Leer vechtsporten

Hoewel het hebben van een vuurwapen nog steeds veel effectiever zal zijn, zou het geen kwaad om wat vechtkunsten te leren die behoorlijk effectief zijn om jezelf op straat te verdedigen, zoals Muay Thai en Jiu-Jitsu.

Een beetje goede kennis van vechtsporten zou erg handig zijn als je gewoon op pad bent om je boodschappen te doen en je jezelf plotseling moet verdedigen tegen een aanvaller.

5 dollar wrench attack

It relies on the computation of large primes, a task infeasible for data of such size. Instead, AES is used. 108.162.250.163 13:54, 15 January 2016 (UTC)Quite often, disk encryption is done in two steps: Instead of generating key directly from passphrase, random symmetrical key is generated and used for actual encryption of whole disk, then encrypted by key generated from passphrase and stored ON the disk. That allows to change the passphrase without reencrypting whole disk.
While the algorithm used for encrypting disk could be and often is AES, it’s possible to use RSA for the second step. And breaking 4096bit RSA would still be quicker than breaking 256bit AES. — Hkmaly (talk) 22:35, 15 July 2019 (UTC)

Lol. The spelling “wench”


My game is up! Drat! ;)Please sign your comments.
– Also this article has been vandalized few times, to change wrench-wench.

5 dollar wrench attack xkcd

January 2014 (UTC)

I went to the flea market and bought a $5 wrench, then used it to beat the password out of 2^5 nerds. I just wanted to prove that there is a $5 wrench and that it’s reasonable to amortize it over multiple extraction sessions. The wrench is still in good shape, even to use as a wrench.
108.162.215.115 18:26, 28 January 2015 (UTC)

Why does everyone imagine that the “crypto nerd” will be a “him”? This gendered language is simply reinforcing the sexist stereotypes that serve as the cultural foundation for rape and other symptoms of this sexist worldview. I’m changing this to “him or her”… — Vctr (talk) (please sign your comments with ~~~~)


The text of the comic refers to the cryptonerd being a him. Please check yourself before you wreck yourself.
While on one hand I don’t think you should go so far as to avoid ever discussing bitcoin with friends and family, neither do you need to announce it to every random stranger who sees you in public… like I once did. I drove a flashy car for several years with a BITCOIN license plate and while it only ever resulted in sparking conversations, it was a risk for me to do so.

The first rule of Bitcoin is: always talk about Bitcoin. The second rule of Bitcoin is: never talk about your bitcoins.

— Jameson Lopp (@lopp) June 23, 2017

The stronger your privacy, the harder it will be for an attacker to find you.


Ranum, alluding to corporal punishment:

…the rubber-hose technique of cryptanalysis. (in which a rubber hose is applied forcefully and frequently to the soles of the feet until the key to the cryptosystem is discovered, a process that can take a surprisingly short time and is quite computationally inexpensive).[8]

Although the term is used tongue-in-cheek, its implications are serious: in modern cryptosystems, the weakest link is often the human user.[9] A direct attack on a cipher algorithm, or the cryptographic protocols used, is likely to be much more expensive and difficult than targeting the people who use or manage the system. Thus, many cryptosystems and security systems are designed with special emphasis on keeping human vulnerability to a minimum.

5 dollar wrench attack2

  1. Attacker doesn’t have enough keys, so you move your funds.
  2. Neither you nor attacker have enough keys, so you’re in a stalemate and have to negotiate a ransom by sending partially signed transactions back and forth.
  3. Both you and attacker have enough keys. You know that this means you’ll both start broadcasting replace-by-fee transactions to spend the coins as soon as the network allows it, effectively creating a race to the bottom of who is willing to burn the most money on transaction fees. As such, you’re incentivized to negotiate a compromise payoff by sending partially signed transactions back and forth instead of racing to the bottom.

Security processes

If you have key(s) held by friends, family, or professional third parties then it’s important to institute processes that those key holders will enforce.

5 dollar wrench attacked

We need more data.

Known failed attacks

While we should learn from our mistakes, it’s preferable to learn from other peoples’ mistakes. Unfortunately, in the vast majority of known physical attacks, the perpetrators were successful in coercing the victim to transfer their money. When did attackers fail?

A man in Norway escaped a home invader by jumping off a second floor balcony.

A Dutch trader endured horrific torture without giving up his private keys.

It’s unclear as to whether or not he was capable of transferring his funds to them.

There is only a single case in which a bitcoiner has successfully defended themselves against a physical attacker – a Miami man who was carrying a handgun shot his attacker.

In summary

Wrench attacks are disturbing to think about, but it’s important to maintain perspective.

5 dollar wrench attackers

For example, in public-key cryptography, the defender may hold the key to encrypt the message, but not the decryption key needed to decipher it. The problem here is that the defender may be unable to convince the attacker to stop coercion. In plausibly deniable encryption, a second key is created which unlocks a second convincing but relatively harmless message (for example, apparently personal writings expressing “deviant” thoughts or desires of some type that are lawful but taboo), so the defender can prove to have handed over the keys whilst the attacker remains unaware of the primary hidden message.
In this case, the designer’s expectation is that the attacker will not realize this, and forego threats or actual torture.
The amount of bitcoin lost to in-person attacks is orders of magnitude less than the amount of coins lost to hacks of exchanges and other trusted third parties. By knowing the risks of bitcoin security, we can design a system that mitigates them.

The ability to slow down attackers by requiring multiple authorizations via a diversity of hardware, software, and physical locations results in a level of security that is arguably greater than that of a traditional bank vault.

Losing sleep over security?

Setting up a multisig Casa account takes less than 10 minutes if you already have a hardware wallet.

362 (9394): 1462–1463. doi:10.1016/

S0140-6736(03)14730-7. PMID 14603923. S2CID 54239764. Retrieved August 29, 2009.

  • ^ ab“Many countries still appear willing to use torture, warns UN human rights official” (Press release). UN News Service. October 27, 2004. Retrieved August 28, 2009.
  • ^Modvig, J.; Pagaduan-Lopez, J.; Rodenburg, J.; Salud, CMD; Cabigon, RV; Panelo, CIA (November 18, 2000).

    Torture and trauma in post-conflict East Timor”. The Lancet. 356 (9243): 1763. doi:10.1016/S0140-6736(00)03218-9. PMID 11095275. S2CID 43717344. Archived from the original on June 8, 2011. Retrieved August 29, 2009.Alt URL

  • ^Iacopino, Vincent (November 30, 1996).

    “Turkish physicians coerced to conceal systematic torture”. The Lancet. 348 (9040): 1500. doi:10.1016/S0140-6736(05)65892-8. PMID 11654536. S2CID 20335366.

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