Questions tagged [cryptography]
Concerning the broad subject of cryptography and its narrow application in Bitcoin protocol and applications.
213
questions
-1
votes
0answers
19 views
Bitcoin Wallet Compromised Question to Clarify the the process? [closed]
I made BTC tnx from Fiat Exchange and send to Android Wallet app.
But Btc Tnx was Transferred to another wallet in same block with RBF opt true.
But i want to double check and transfer $10 in btc ...
-1
votes
1answer
42 views
Could a computer virus made less than a mb, which is sent as transaction that attacks miners? [closed]
What happens if computer virus less than a mb is sent as transaction that attacks miners?
0
votes
0answers
20 views
private key to public key generation bitcoin vb.net gives unknown error - secp256k1 eliptic curve
I'm trying to use secp256k1 eliptic curve to get the public key from private key but it gives me an unknown error error
Private Sub Button13_Click(sender As Object, e As EventArgs) Handles Button13....
2
votes
1answer
55 views
Positive or negative private key of a bitcoin wallet?
Private key is a number. Is the question positive or negative? Is it possible to know a positive private key or negative if you only know the public key?
For instance:
Positive private key: 2
...
1
vote
0answers
25 views
security of the mining algorithms litecoin vs bitcoin - scrypt vs sha256?
how is the cryptanalysis' current state on both sha256 and litecoin's scrypt?
is litecoin's scrypt on a security level like sha256?
by security i simply mean ways to "break"/"de-cipher" the hash ...
1
vote
1answer
44 views
How many bits of entropy is a Bitcoin address?
I've seen references to 160 bits of entropy, but I'm not sure if this is universal or just applies to the old address format.
1
vote
2answers
37 views
BTC transfer duration
When BTC is mined, it is sent to the BTC wallet. The duration of the transaction can be up to 24h for online wallets.
Is the duration faster, when transferring BTC to a “cold wallet”?
4
votes
3answers
281 views
Are BTC Private Keys evenly distributed in 256bit space?
If we assume that there are ~2^96 private keys for EACH bitcoin address (2^256-160) and we assume that in cryptography it is considered good property of every hash function if it evenly distributes ...
3
votes
1answer
55 views
I need to know about wallets in cryptocurrency, how do exchanges generate deposite address per user?
In exchanges like Binance when a user wants to deposit coins in bitcoin or in other coins, per user receives a unique public key? Do they have to generate pair key private/public key for each user in ...
0
votes
1answer
18 views
Learning to trade iOS user friendly crypto wallet safety when stored in and transfer for trading or use to purchase or get cashed
iPhone users best crypto wallet in bitcoin currency trading and transfer for easy access to use and keep safe deposit and profits as a new and first time trading experience to the trading crypto ...
0
votes
0answers
21 views
What does Google's quantum supremacy mean to Bitcoin? [duplicate]
Recently, there has been a heated discussion on the internet about a paper published by Google on NASA's website saying that Google has achieved the so-called "quantum supremacy", which generates ...
0
votes
0answers
21 views
At what step does the private key is transformed to mnemonic phrase [duplicate]
If I am correct to make a private key you have to first generate a random 256 bit number then transform it to a WIF private key using base 58 check encode, does the mnemonic phrase is generated from ...
4
votes
0answers
50 views
Can ECDH peers waste each other's time at will?
Peter Dettman notes that ECDH peers can waste each other's time at will. What does he mean? Can this be weaponized against Lightning nodes?
0
votes
2answers
95 views
Is there any blockchain explorer available to track the trades of cryptocurrency exchange?
I haven't seen any decentralized exchange that provides the information of trades and can track the record of transaction history and time.
I am looking forward to that exchange which can provide ...
0
votes
0answers
43 views
BIP32 HD Wallet vs HMAC vs Hashing
I've been working on a website which will be caring out various cryptographic operations. On the website users can post Ads. Each Ad has a monotonically increasing unique ID. For each Ad, I would like ...
-1
votes
1answer
40 views
Is IQmining worth the investment? [closed]
I am interested in investing in crypto-contracts, is IQmining worth the investment?
0
votes
1answer
45 views
Consider using Bitcoin but just heard the IRS is sending tax notices to 10k plus users
article: https://www.cnn.com/2019/07/26/tech/irs-cryptocurrency-taxes/index.html
My background: Good understanding of RSA cryptography, some elliptic curve, Number Theory and I am a (real)programmer
...
0
votes
1answer
34 views
How public-key cryptography secures bitcoin transactions from 51% attacks and Mining Attacks
I wanted to better understand how public-key cryptography avoids 51% attacks and mining attacks, also if this question is wrong please correct so that i can improve my research and provide me with ...
0
votes
0answers
24 views
What role does public-key cryptography play in bitcoin transaction? [duplicate]
Explain in one word and kindly tell what is it exactly that public-key cryptography does in bitcoin.
3
votes
2answers
306 views
To what extent does asymmetric cryptography secure bitcoin transactions?
Is there a specific attack or bug which asymmetric cryptography prevents during bitcoin transactions?
2
votes
2answers
107 views
Are there valid transactions which are impossible to mine?
Is it possible to have a bitcoin transaction T that is valid with a very generous transaction fee for which it is impossible for T to be included in the next block, or even in all subsequent blocks?
...
0
votes
0answers
38 views
How to integrate bitcoin address generator into website
I want to integrate a bitcoin accounts and address generator into my website, similar to those found on crypto exchanges. Users can generate addresses and have their own accounts. Is there an open ...
0
votes
0answers
47 views
Shamir SSSS how to split the example if i want to use 12 Bits instead of 11 Bits?
Shamir Mnemonics are encoded into 3 components - the Version, the Parameters, and the Shamir Share.
The encoded components are concatenated together to form a Shamir Mnemonic.
First Component is ...
0
votes
1answer
49 views
What's the purpose of CSHA256::Write and CSHA256::Finalize
Looking at Bitcoin Core implementation of SHA256, I noticed it was a bit different from OpenSSL's implementation.
In OpenSSL, you would initialize a variable with SHA256_CTX when in Bitcoin Core it's ...
0
votes
1answer
79 views
Confused on using SHA256 code from Bitcoin Core
I was looking at Bitcoin Core code to use its SHA256 code but am confused on where I should be looking at.
In bitcoin/src/crypto/sha256.h there is CSHA256
and in bitcoin/src/crypto/sha256.cpp there ...
4
votes
1answer
160 views
What are the 3 arguments called in function SHA256?
void sha256(struct sha256 *sha, const void *p, size_t size)
{
struct sha256_ctx ctx;
sha256_init(&ctx);
sha256_update(&ctx, p, size);
sha256_done(&ctx, sha);
}
I'm trying ...
3
votes
1answer
72 views
ECDSA - why not using the cyclic additive group
As I understand things so far, the ECDSA scheme used by Bitcoin uses a group G generated by a point on the elliptic curve y^2 = x^2 + 7.
Now G is a cyclic group of finite order n and is, hence, ...
2
votes
0answers
49 views
Schnorr Fiat Shamir Transformation
In the Schnorr identity protocol, we can transform the interactive ZKP into a non-interactive one by replacing the role of the verifier (i.e. providing a random challenge value) with a hash function ...
0
votes
1answer
75 views
How to verify signature of multisig transaction
How to verify signature of multisig transaction (2-2) after it being signed by first owner? How can I understand if that owner used wrong private key => wrong signature?
2
votes
1answer
90 views
How to make a homomorphic preimage/payment hash with current lightning network / Bitcoin implementations?
If I remember / understand it correctly by using the mechanisms from the scriptless scripts paper we could easily create homomorphic preimages / paymenthashes.
I think this would be a very desirable ...
4
votes
1answer
296 views
Low-s value in bitcoin signature
What are the problems related in using the "normal" ( bigger than N/2) value of the s number in transaction signature and why we use the lower one?
Is it about the math behind the ecdsa?
0
votes
1answer
191 views
how to place a bitforex api buy order
I have read the documentation for BitForex on placing a buy order here:
https://github.com/bitforexapi/API_Doc_en/wiki/Order
Then after understanding that, I read the API Call Description ...
0
votes
1answer
81 views
Private key generation doubt
I read that the private key pk has to be any number between 1 and n, where n is almost 10^77.
Since pk' s function is practically to be used as a scalar for multiplying the generator point G, why does ...
2
votes
2answers
457 views
How can my private key be revealed if I use the same nonce while generating the signature?
I know it is well understood that it is not a good practice to use the same nonce while generating the signatures, but I am not getting the math right.
Assume I have some UTXOs that are controlled ...
0
votes
1answer
71 views
Are transactions with the same ScriptSig a security problem?
For instance while looking at the transaction stack of my address, tracing it to exchanges I use, I came across this:
https://www.blockchain.com/btc/tx/...
2
votes
1answer
112 views
What is the current computing speed of performing an elliptic curve multiplication?
Hi I was just looking for some information on how long it would take to crack a private key in bitcoin using a brute force approach and I couldn't find a very good answer for how long it takes to ...
0
votes
2answers
129 views
The order of the generator point G used in bitcoin
Hi I was just wondering how the order of the generator point G used in bitcoin was actually calculated.
From the specification listed http://www.secg.org/SEC2-Ver-1.0.pdf for secp256k1 I can see ...
0
votes
1answer
91 views
Bitcoin Signatures are susceptible to quantum attacks - how exactly and with what practical impact? [duplicate]
@PieterWuille wrote in another thread:
""
The hashing algorithm is probably the most quantum-resistant piece of cryptography right now in Bitcoin. Barring any specific breaks, SHA256 and RIPEMD160 ...
1
vote
1answer
123 views
How can you calculate the inverse of S component of signature, while you cannot do it in ECC to calculate private key from public key?
When verifying the signature in bitcoin, we calculate S^(-1) * hash(m) * G + S^(-1) * R * pub_key and verify that this is equal to the temporary public key. Given the same logic, why can't we use it ...
2
votes
1answer
153 views
What is so special about chacha20 stream cipher along with poly1305 for message authentication codes?
I am currently trying to dissect the low level cryptography protocols of the lightning network and I realize that in many places chacha20 is being used. I tried reading about it in the Wikipedia ...
3
votes
1answer
162 views
ECDSA signature with r value of 31?
occasionally on Android we are generating an ECDSA signature. This turns out to have a "r" length of 31 bytes. Is that valid?
For reference here is a nice diagram outlining the ASN.1 structure of ...
-1
votes
2answers
212 views
How would one prove he is Satoshi Nakamoto if he lost his private keys
Assume you're Satoshi Nakamoto, completely, and that you've forgotten your private key/s. How do you prove that this is true, using the BTC blockchain? Is there a transaction you can make, or a ...
0
votes
1answer
803 views
BITCOIN SCRIPT: Write the bitcoin ScriptPubKey script for a transaction that can be redeemed by anybody who supplies a square root of 1764?
Bitcoin script: For the following questions, you're free to use non-standard transactions and op codes that are currently disabled. You can use as a shorthand to represent data values pushed onto the ...
0
votes
0answers
50 views
Correct breakdown of the name of secp256k1?
sec Standards for Efficient Cryptography
256 256bit prime
k1 Koblitz curve no. 1
?
1
vote
1answer
170 views
How specific are ASIC's design? Can they single hash SHA256?
I understand that Bitcoin's ASICs are a highly optimized piece of equipment and, therefore, are also very specific.
My question: are they able to do a single (or triple?) SHA-256 hash at all? And, ...
7
votes
2answers
2k views
Is a bitcoin address collision possible if generating 90 million addresses every 4 hours?
I am running a test to see if I can obtain a successful bitcoin address collision after generating billions of addresses. I am not entirely sure how I would check them yet. Basically I have an extra ...
14
votes
1answer
2k views
What is the origin of insecure 64-bit nonces in signatures in the Bitcoin chain?
In Biased Nonce Sense: Lattice Attacks against Weak ECDSA Signatures in Cryptocurrencies Joachim Breitner and Nadia Heninger use a lattice based algorithm to recover private keys from signatures in ...
1
vote
1answer
57 views
Security implications of removing CHECKSIG in a test
If I conduct an htlc transaction on testnet that does not include OP_CHECKSIG will it still cost an attacker more than (say) $10 in processing power or storage to subvert my tests?
Details: I'm ...
2
votes
1answer
660 views
Bitcoin Core Old Wallet.dat Vulnerability
Own a wallet.dat file from 2010-2011. Yesterday I saw there was a vulnerability which is makes attacking somewhat easier if your wallet is generated by old client and I'm pretty sure my wallet is ...
1
vote
1answer
91 views
Setup bitcoin-seeder
I wanna setup a dnsseed for a crypto currency using sipa/bitcoin-seeder on my VPS.
The server is hosted at NetCup and running the software as root, and also listening on port :53 UDP.
My domain is ...
