Questions tagged [cryptography]
Concerning the broad subject of cryptography and its narrow application in Bitcoin protocol and applications.
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I try to get crypto account(asset) by call PHP page. but it doesnt work. until now I dont understand a basic rules(concept)
I'm Korean. My excahnges is UPBIT.com
I'm trying to get my asset info by using UPBIT Apis.
My PHP code doesnt work.
There is 3 files having shown bellow in same folder of PHP server
[3]: @link ...
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0answers
12 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 ...
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0answers
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How do I get inflation rate for crypto coins in csv format
I'm interested in doing econometric analysis of crypto coins and returns based on inflation rate. Any csv files that has all coins and inflation rate? Thanks.
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1answer
19 views
is it possible to encrypt the message with PUBLIC key and decrypt with SAME PUBLIC Key? [on hold]
In asymmetric cryptography, is it possible to decrypt the message with the SAME PUBLIC key with which the message was encrypted ? or message encrypted with public key can ONLY BE decypted with ...
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25 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 ...
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1answer
25 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 ...
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1answer
35 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 ...
3
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1answer
143 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
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1answer
52 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, ...
1
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0answers
30 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 ...
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1answer
39 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?
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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 ...
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1answer
44 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?
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1answer
32 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 ...
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1answer
63 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 ...
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2answers
340 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 ...
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1answer
29 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/...
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1answer
81 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 ...
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2answers
68 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 ...
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1answer
46 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
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1answer
101 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
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1answer
103 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
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1answer
57 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 ...
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2answers
122 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 ...
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1answer
142 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 ...
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26 views
Correct breakdown of the name of secp256k1?
sec Standards for Efficient Cryptography
256 256bit prime
k1 Koblitz curve no. 1
?
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1answer
143 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, ...
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0answers
16 views
Private Blockchains: Blocks’ validation
I’m a software developer and I’m trying to understand blockchain at a code level
I have the following issue:
There’s a private blockchain, this private blockchain does not have any relation to ...
7
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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 ...
13
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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 ...
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1answer
48 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 ...
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1answer
306 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 ...
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1answer
53 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 ...
0
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2answers
36 views
In theory could a pubkeyhash script be solved without the public key in the scriptSig?
When signing a pubkeyhash UTXO, it is required to provide both a signature and a public key. The public key is duplicated and one copy is provided to op_checksigverify to ensure the signature is valid,...
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2answers
38 views
How bitcoin gets monetary value [duplicate]
This looks like a complex thing but I am trying hard to understand it. Why would any one in the world honor a crypto currency till it is backed by a government with monetary value? How does a crypto ...
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1answer
529 views
Looking for code generate bitcoin address from passphase in C++
i'm try to write a program which generate bitcoin address from given hash sha256 of passphase as private key or given hex private key. I've found a library for this but it required Boost package in ...
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1answer
37 views
Is hashing an optional step to use with public key cryptography for blockchain
I am confused by the public key cryptography versions that I've read so far. Are the steps optional, dependable on the types of blockchain or they are referring to different methods?
Version 1 =======...
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2answers
53 views
I am just wondering what are the methods which can hide all the transactions and also able to validate transactions in an block chain?
I am new to block chain and was looking at how block chain work mainly proof of stake based . They check validity by going through all the transactions which is something concerning as everyone can ...
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2answers
103 views
How to get the generator G point for any new curve?
I have this bitcoin curve:
y^2 = x^3 + 7
but the finite field Fp is modified to be:
n=115792089237316195423570985008687907853269984665640564039457584007908834675927
1-What is the G point?
2-how ...
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1answer
59 views
proof of stake concept and implementation confusion
i'm currently studying proof of stake concept in cryptocurrency in preparation of building it soon, but i still have some doubts about my understanding of the concept itself, and i have a lot of ...
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0answers
148 views
Idioms of use/ bitcoin heuristic
I already know the answer of a) part which is Alice. Can anybody help me in finding answer of b) part.
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1answer
28 views
How can I use messengers for crypto transactions?
Is it possible to use Signal or Telegram for crypto transactions?
I heard CryptoCat messenger is for such needs, but interested in using those two mentioned above.
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1answer
67 views
Can Bitcoin Tech be Used to Protect Journalists [closed]
Over eight Nigerian journalists are currently in police detention because they published investigative news stories that didn't sit well with the government of the day.
How can the bitcoin ...
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1answer
30 views
Have all hashes of unlocked difficulty levels of cryptocurrencies been mined?
I'm wondering if all the hashes of a previously unlocked difficulty level of a cryptocurrency, such as
0000000000000000xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx BTC
, have been completely ...
0
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1answer
40 views
Multisig Wallet Question
I think I understand multisig wallets: X out of Y signatures are required for a transaction to be made.
My question is: is there such a thing as a multisig wallet where any ONE of the allowed ...
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1answer
127 views
What's the difference between xpub and bpub?
I've seen extended public keys such as the one below
xpub661MyMwAqRbcFLCsW67CH9AgprkK2MbeLbmdMiBRWb1Wamm6GjGhTFQChvPmwQGQh78MMd8Eu7CLJ7FEuwhsomD66XC74VnfgHdEx1NFSKL
But now I've seen a bpub
...
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2answers
89 views
Is there a single point generator G for every elliptic curve?
I understand that G is a point on curve which holds true for y^2 = x^3 + ax + b.
But there can be several other points as well which holds true for above equation but how do we choose which one is our ...
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0answers
39 views
Could a network described below function and how well?
I have an idea I am working on for some time, it would be using blockchain technology. However, although I know something about blockchain as it stands today, I am lacking a more deepened knowledge ...
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1answer
250 views
What is the difference between digital signature and a digital fingerprint?
I've been reading the book, Mastering Bitcoin by Andreas M. Antonopoulos, in chapter 4, the cryptography used in bitcoin is classified as: keys, bitcoin addresses and digital signatures.
I understand ...
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0answers
133 views
Would it be possible for an 8-bit microprocessor to create a bitcoin keypair?
Context for question: With the latest security breaches around modern CPU's (Spectre / Meltdown) I was wondering if we could generate ECDSA keypairs on cheap, small and/or simple air gapped (micro)...
