All Questions
125 questions
0
votes
1
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49
views
Could anyone explain ge_frombytes_vartime for me?
Recently I am working on monero source code, and I wonder how monero verify ed25519 public key is invalid. Is this function converting the public key into Y coordinates, then calculating the X ...
- 1
0
votes
0
answers
48
views
How to have list of incoming and outgoing tx given an address?
I have my full monero node and I'm trying to extrapolate from it, all the tx (incoming and outgoing) involving my address. Right now I'm using the monerojs library and scanning the blocks, the data I'...
- 1
0
votes
1
answer
368
views
Create a key pair for a Monero wallet through the seed generator from the BIP32/BIP44 standard
I am trying to derive my accounts of different blockchains via BIP44 standard to have deterministic account hierarchy. I was able to generate keys for BTC,ETH and other blockchains, but not for monero ...
- 1
0
votes
1
answer
315
views
Quantum-safe stealth addressing
Many of you will know that the stealth addressing system used in Monero is vulnerable to quantum attacks, due to it being based on quantum-weak cryptography. Although not all payments would be ...
- 21
1
vote
1
answer
91
views
Monero public key generation
I'm trying to get the public key with different JavaScript libraries: with elliptic and with libsodium-wrappers-sumo This is my code:
const BN = require('bn.js');
const EdDSA = require('elliptic')....
- 87
1
vote
1
answer
109
views
Are hex private keys already in little endian format?
I implemented my own private (seed) spend and view key generator for learning purposes but I still don't fully understand. I ended up with a working implementation but I feel that I'm just swapping ...
- 63
1
vote
1
answer
53
views
Why is the limit in the random32_unbiased function different between the comments and the actual code?
I'm talking about this specific function:
void random32_unbiased(unsigned char *bytes)
{
// l = 2^252 + 27742317777372353535851937790883648493.
// l fits 15 times in 32 bytes (iow, 15 l is ...
- 63
2
votes
1
answer
124
views
ed25519 problem with libsodium implementation S_a + S_b = (s_a+s_b)*G
I'm trying to make my own implementation of atomic swaps by following this article. I use a low level node.js bindings for libsodium for this.
If I understand the protocol correctly, then Alice and ...
- 87
2
votes
1
answer
67
views
Monero secret key (32b) vs libsodium ed25519 secret key (64b)
I'm trying to move cryptographic key operations in the Monero Python module from pure Python to pynacl which is a wrapper around libsodium.
The first problem I stumbled upon is that Monero secret keys ...
- 620
1
vote
0
answers
27
views
Leveraging FHE transpiler in Monero
Google released recently FOSS source code for a "Fully Homomorphic Encryption Transpiler". Here is the associated paper.
How can this be leveraged for Monero ?
For example, can this be used ...
- 2,968
1
vote
1
answer
92
views
Possible error in book Zero to Monero: Second Edition
I am reading the book Zero to Monero: Second Edition from the GetMonero Library.
On the 3rd paragraph of page 15, the book mentions an algorithm for finding points inside the subgroup of order l, ...
- 13
1
vote
1
answer
64
views
How to compute ringct multisignature key images? (Disambiguation of MRL005)
I'm looking at the multisignature scheme provided by MRL005 Section 4.4, and some things are unclear to me. I've attached a picture below of the expression for which I'm seeking some clarification.
...
- 13
3
votes
2
answers
180
views
What is the size of the set of spent key images in Monero?
For research purposes, I want to know the following:
What is the exact size of the set of already spent key images and how it can be checked? Do we need to download the Monero blockchain to get the ...
- 73
5
votes
1
answer
228
views
What is Triptych and how does it relate to Monero ring signatures?
Monero Research Lab recently published a research paper on Triptych: https://eprint.iacr.org/2020/018
What is Triptych, and what are its advantages and disadvantages compared to CLSAGs?
- 8,826
1
vote
1
answer
296
views
What is "Janus"-linking?
How did it get its name?
The attacker can't actually steal Monero, right?
It relates to a clever use of cryptography involved in subaddresses? How so?
Can it be mitigated?
- 5,515
0
votes
0
answers
97
views
Understanding a security proof of RingCT 3.0
I am reading the paper "RingCT 3.0 for Blockchain Confidential Transaction:
Shorter Size and Stronger Security" (https://eprint.iacr.org/2019/508.pdf), an improvement to Ring Confidential Transactions....
- 113
3
votes
2
answers
359
views
Should Monero use ElGamal commitments instead of Pedersen commitments?
Following on from the Q/A
regarding "perfectly hiding and computationally binding" commitments, it is
mentioned ElGamal commitments can be used to flip the commitment properties to
become "perfectly ...
- 19.4k
4
votes
2
answers
483
views
What is the impact of having perfectly hidden but only computationally bound commitments?
Monero uses Pedersen commitments to make transaction amounts private (hidden), but what, if any, are the problems of perfectly hidden and computationally binding commitments?
- 19.4k
0
votes
1
answer
185
views
Implications and remedies of fixed 'H' in Pedersen commitment
In the monero document "Zero to Monero" pp. 30 the Pedersen Commitment scheme is described as requiring generators G, H such that no-one knows an x where G = x*H. The actual H is defined as H=to_point(...
1
vote
1
answer
57
views
Is there a written document or resource about CryptoNight v2?
I am looking for something like this:
https://cryptonote.org/cns/cns008.txt
It's got a detailed, written explanation and not just code. I am trying to make a miner for learning purposes so I guess ...
- 43
2
votes
1
answer
127
views
How does the code for scalar reduction work?
In this piece of code:
https://github.com/monero-project/monero/blob/master/src/crypto/crypto_ops_builder/ref10CommentedCombined/sc_reduce.c#L35
We reduce a scalar by mod l.
what is the ...
- 660
3
votes
1
answer
75
views
Is a mnemonic for view only wallet possible?
It occurred to me that one may wish to restore a wallet on a compromised computer. Perhaps they need to prove that a payment was received.
Regardless of whether this is a good idea, is it possible ...
- 5,515
2
votes
1
answer
108
views
Why is it necessary to have such long addresses?
In the cryptonote paper, it says the address needs to be so long because there has to be a spend key and a view key. where the receiving address is calculated like this;
address = Hs(rA)G + B
but ...
- 201
2
votes
1
answer
73
views
Reasons for the way the mask/amount is calculated?
I am reading some monero docs and it says that the mask and amount are generated like this;
mask = x + H(K); //where x is the blinding scalar
amount = b + H(H(K)); //where b is the amount
`K` is the ...
- 201
2
votes
1
answer
421
views
Explanation of how exactly the pederson commitments in monero work?
so lets say for the first commitment (after a mined transaction)
let a = miner_reward
this is a known number.
to generate the first commitment, one does;
input = x.G + a.H; output = x.G + a.H
...
- 201
2
votes
1
answer
164
views
Why is it necessary in confidential transactions to have two generators?
So as i understand it (though im not sure if its the same w/ bulletproofs so please correct me if im wrong), a commitment is generated like this;
commitment = (blinding_secret . G) + (value . H)
...
- 201
4
votes
1
answer
95
views
CryptoNight detail. Why this kind of multiplication?
The Cryptonight description by the CryptoNote team states that
The 8byte_mul function, however, uses only the first 8 bytes of each
argument, which are interpreted as unsigned 64-bit little-...
- 105
4
votes
1
answer
283
views
Who Generates parameters G & H for Pedersen commitment in Monero?
Who (which party) generates parameters G & H for Pedersen commitment in Monero? I mean for a confidential transaction in Monero, pedersen commitment is required which has parameters G & H ...
- 41
5
votes
1
answer
170
views
What is the concept of Refund Transactions from the MRL?
I am searching for more information on the concept of refund transactions.
I found that the MRL is working on a paper on the topic (source).
Would this be something that will be used in channel ...
- 985
1
vote
1
answer
189
views
What makes decoding the total sent amount using the viewkey potentially inaccurate?
When using the 'decode outputs' on moneroexplorer for a TX that I sent, I get this warning when it (correctly) estimates the amount that I spent:
Possible spending is: spent amount (tx fee included)...
- 121
4
votes
1
answer
249
views
How is Keccak calculated in Monero?
I am reading the monero's implementation of Keccak (used as first part of slow_hash) in src/crypto/keccak.c
I have found that it is a Keccak-256 (with b=1600, c=512, r=1088) and "output" of 1600 bits ...
- 178
3
votes
1
answer
508
views
What are the hex representations of the small subgroup curve points on Ed25519?
Monero uses Ed25519, which has a cofactor of 8. This means the curve has a prime order l = 2^252 + 27742317777372353535851937790883648493 and the total number of possible points on the curve is 8l. ...
- 8,518
1
vote
1
answer
357
views
Is the connection over Tor between client and remote node safe?
I'm using torsocks to connect my CLI wallet to a remote node (geo.node.moneroworld.com:18089). I don't need a high level of anonymity, but I would like to understand what information is at risk. For ...
- 11
0
votes
1
answer
136
views
How do I multiply 2 public keys?
I want to make DH-like key exchange calculating something like this:
b = H(b0B1B2)
But the problem is multiplication between two ec-points is not defined on ec-curve.
I know monero makes some ...
- 121
1
vote
1
answer
166
views
Get Transactions from payment ID
I know how to generate payment id and how payment id works. But how can i get all transactions for a payment id from monero wallet CLI. Is there a way to do that? And command for that will be greatly ...
- 13
5
votes
1
answer
189
views
Where can I learn about the cryptography used in Monero? [duplicate]
What papers should I read to understand the mathematics behind Monero?
- 8,518
4
votes
2
answers
567
views
Understanding MLSAG in Monero transaction
This is a followup question to Understanding the structure of Monero transaction with emphasis on the MLSAG part.
Here's the transaction's structure again given with print_tx ...
- 177
1
vote
2
answers
141
views
Explore Monero Blockchain in Ubuntu
Can someone tell me step by step approach to explore Monero Blockchain in Ubuntu? From the beginning. Is there any way explore it with the terminal to see inside each block? Like what is the index of ...
2
votes
1
answer
168
views
How Monero transactions related with mixins
Can anyone explain me is there a relationship between transaction outputs with the number of mixins using in the transaction? I meant If someone sends 12XMR to someone else with 5-mixins how many ...
3
votes
1
answer
3k
views
How does Ring Confidential Transactions work?
Can someone explain to me how RingCT works and how the recipient gets the actual amount from the encrypted amount in a RingCT transaction?
2
votes
1
answer
496
views
How to convert monero's curve25519 basepoint to bouncycastle
This is how to get the curve25519 basepoint in monero (use js console at https://xmr.llcoins.net/)
> var identity = "0100000000000000000000000000000000000000000000000000000000000000"
> var base ...
2
votes
2
answers
132
views
How the sender recover the transactions that he spent?
In order to compute the balance of his own wallet, (I assume that) a client needs to retrieve:
1- The transaction that he is the receiver.(By scanning the whole block-chain and compare with his own ...
- 367
6
votes
1
answer
364
views
Transaction structure: Question about ecdhInfo
This question by kenshi84 shows how the pseudoOuts and outPk fields can be validated by anyone (without knowing any of the private keys involved), by checking that sumIn === sumOut:
> var H = ...
4
votes
1
answer
150
views
How is m calculated when generating subaddresses
In Kenshi's notes in the subaddresses PR it says that when generating subaddresses m = Hs(a || i) and i is just the index of the subaddress. so if a is the secret view key "...
3
votes
1
answer
176
views
An academic "hello world" on Monero
I'm a graduate student looking to improve my skills in real-world applications of cryptography and online anonymity. Reviewing all of the new blockchain and alt-coin variants, I believe that Monero is ...
- 321
2
votes
1
answer
478
views
Will Monero suffer the transaction fee problem like Bitcoin?
Currently, BTC has a problem with small transfers, i.e sending £1 will cost £4 which is just ridiculous. Will XMR ever have the same problem? I know LTC have sloved this issue and Bitcoin cash has ...
- 123
3
votes
1
answer
382
views
Using Monero as proof of funds
I'm writing an article about the future of Healthcare. I wondered if it was possible to use Monero to make a proof of funds. For example: the hospital wants to know that I can pay for the medical care ...
- 242
5
votes
1
answer
71
views
(Non-ring) Wallet signatures
I am reading about ECDSA and EdDSA. I was wondering what the Monero void crypto_ops::generate_signature signature is based upon. From the code, I see that the math to generate one is
k = rand()
t3 = ...
- 307
3
votes
1
answer
119
views
Discrepancy CNS006 and CryptoNote whitepaper one-time key generation
CryptoNote 2.0 uses P=Hs(rA)G + B for the generation of a one-time key.
CNS006 seems te change this to P=Hs(rA||n)+B, where n is the transaction index (encoded as varint).
Why is there this ...
- 307
6
votes
2
answers
7k
views
How to know when I get paid from mining Monero
I just started to mining Monero, using Claymore v3.8. Via CPU.
With my very weak knowledge of mining, I just want to see a "payment" so can be sure that I am not mining for nothing.
I am using ...
- 161