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0
votes
2answers
76 views

How would you set up a ‘cold’ netbook for master-key signing, large Bitcoin transactions, etc? [closed]

I've just ordered a cheap-o netbook on Amazon, with the intention of installing a Linux distro, and turning it into a permanently-offline high-security machine for sensitive tasks. However, I'm no ...
-1
votes
0answers
24 views

What is BitCoin? [migrated]

I was reading some stuff about security and from where I heard the term Bitcoin. Googling gave me the definition that it is an online based payment system. Can anybody give me a very brief description ...
0
votes
2answers
65 views

Why don't sites implement a system where a wrong password causes a 3 second delay?

I am into bitcoin right now, and the password threats scare me a little... Not so much for me, because I use LastPass and generate new passwords at 20 characters and it includes symbols, upper and ...
1
vote
1answer
102 views

Tiny USB sticks

To store my Bitcoin safely, I have an offline transaction setup. Computer A is online with a copy of the blockchain, and computer B is offline with the private keys. To make a transaction, I craft it ...
1
vote
1answer
82 views

Anonymity of Bitcoin

I just asked myself that when you have bitcoin network, which is as we know "pseudo" anonym. Because of the transaction logs of the network (which are afaik endless), it seems that transactions are ...
0
votes
1answer
129 views

compromising DVRs to become bitcoin mining bot [duplicate]

I read this article, about an exploit which highjacks a DVR to become a "bitcoin mining bot". The heart of the attack is to send a binary using just echo comands to the device, which acts as a ...
0
votes
2answers
71 views

Is it safe to use a ECDSA public key as a password seed for GCM/AES?

Two peers already exchanged their ECDSA (curve secp256k1) public keys using a secure channel. They want to establish an authenticated encrypted channel between them. They will use CCM mode and with ...
0
votes
1answer
212 views

Can I use crypto.getRandomValues to create a private key?

In the window.crypto spec: http://www.w3.org/TR/WebCryptoAPI/#RandomSource-interface It says explicitly: "Do not generate keys using the getRandomValues method. Use the generateKey method ...
6
votes
4answers
320 views

Is webRTC safe against man in the middle attacks?

We are implementing an open source software package (copay, a multisig bitcoin wallet), that uses peerJS, which uses webRTC to allow peer-to-peer communication between browsers. peerJS (and webRTC) ...
-2
votes
2answers
68 views

Could a network host and process programs while securing against piracy?

Consider an ideal service hosting network, which: Lets programmers: Publish a program in such a way that it can't be retrieved. Associate a program with a wallet. Specify a cost per request and ...
1
vote
1answer
81 views

Minimum SHA256'd UTF8 encoded passphrase length not stored anywhere

For a passphrase that is UTF8 encoded and then SHA256'd, what is the minimum length to achieve a practically collision free result? The implementation is for a 32 byte cryptocurrency ed25519 seed ...
11
votes
1answer
425 views

Is the Litecoin Scrypt hashing technique a threat to hashed passwords?

The Bitcoin alternative, Litecoin uses a different algorithm to protect the block chain, namely Scrypt (not Sha256). Given that GPU accelerators exists, and ASICS are due to be released, does the ...
14
votes
2answers
959 views

Are there any tell-tale signs of self-hacking? [closed]

After the Mt.Gox crash, and also keeping in mind recently published attacks on Target and Neiman Marcus, one is led to believe that sometimes so-called hacking is perpetrated by insiders. What are ...
0
votes
1answer
175 views

Building an VM with Vagrant and connecting with ssh+2FA to protect a bitcoin wallet?

I would like to try to build a Virtualbox image to use with Vagrant. This is the features: Login with SSH + 2FA (Google Auth) No X No internet connection Copy unsigned transaction, sign it and ...
1
vote
1answer
82 views

Ideal cryptocurrency digital signature

What are the characteristics of the ideal digital signature for cryptocurrency transaction verification? The reason I ask is because this answer about bitcoin signatures describes a potential ...
9
votes
3answers
11k views

With ASIC bitcoin miners, should SHA256 be considered insecure for password hashing?

I'm sure everyone here has seen the rise and further rise of bitcoin. The process used for mining bitcoin is basically "let's brute force an SHA256 hash that is less than this amount" That being ...
9
votes
3answers
8k views

Detect Bitcoin Mining

So, me and a network administrator friend were discussing about bitcoin mining. With so many portable bitcoin mining software, we wanted to find the different ways to detect them in the network. How ...
6
votes
1answer
570 views

Safest way to keep an offline bitcoin wallet

Keeping a large amount of bitcoins in an online computer is dangerous. The bitcoin wallet is merely a file, and once the file has been copied the bitcoins can be transferred to another account. ...
1
vote
2answers
1k views

Best practices for operating a Bitcoin-Qt client regarding netwok privacy?

As privacy is part of security, I know there is a Bitcoin SE here but they couldn't answer my question so I hope it's appropriate to ask it here. I don't ask about how to secure my wallet on my ...
9
votes
6answers
2k views

Security of SHA256 and Bitcoins

The Bitcoin network use SHA256 as a core component to it's design. I'm no expert on cryptography, but it seems to me it usually is only a matter of time before security vulnerabilities are discovered ...