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I'm still new to public key crypto. I'm trying to understand how it is that the private key is generated first in public key crypto? I would have expected the private and public key to be generated at the same time, as they would depend on each other. Apr 08, 2017 The following are instructions on how to use MyEtherWallet (“MEW”) to create a private address for receiving TRST tokens. Note however: MEW is one choice for using a wallet, there are many others out there. It is the user’s responsibility to perform the required research and choose the best ERC20-compliant wallet for them.
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Conversion from ECDSA public key to Bitcoin Address
This article may be too technical for some users. The more basic article on Bitcoin Addresses may be more appropriate.
A Bitcoin address is a 160-bit hash of the public portion of a public/private ECDSA keypair. Using public-key cryptography, you can 'sign' data with your private key and anyone who knows your public key can verify that the signature is valid.
A new keypair is generated for each receiving address (with newer HD wallets, this is done deterministically).The public key and their associated private keys (or the seed needed to generate them) are stored in the wallet data file.This is the only file users should need to backup.A 'send' transaction to a specific Bitcoin address requires that the corresponding wallet knows the private key implementing it.This has the implication that if you create an address and receive coins to that address, then restore the wallet from an earlier backup, before the address was generated, then the coins received with that address are lost; this is not an issue for HD wallets where all addresses are generated from a single seed.Addresses are added to an address key pool prior to being used for receiving coins. If you lose your wallet entirely, all of your coins are lost and can never be recovered.
Bitcoin allows you to create as many addresses as you want, and use a new one for every transaction.There is no 'master address': the 'Your Bitcoin address' area in some wallet UIs has no special importance.It's only there for your convenience, and it should change automatically when used.
Bitcoin addresses contain a built-in check code, so it's generally not possible to send Bitcoins to a mistyped address. However, if the address is well-formed but no one owns it (or the owner lost their wallet.dat), any coins sent to that address will be lost forever.
Hash values and the checksum data are converted to an alpha-numeric representation using a custom scheme: the Base58Check encoding scheme. Under Base58Check, addresses can contain all alphanumeric characters except 0, O, I, and l. Normal addresses currently always start with 1 (addresses from script hashes use 3), though this might change in a future version. Testnet addresses usually start with m or n. Mainline addresses can be 25-34 characters in length, and testnet addresses can be 26-34 characters in length. Most addresses are 33 or 34 characters long.
Collisions (lack thereof)
Since Bitcoin addresses are basically random numbers, it is possible, although extremely unlikely, for two people to independently generate the same address. This is called a collision. If this happens, then both the original owner of the address and the colliding owner could spend money sent to that address. It would not be possible for the colliding person to spend the original owner's entire wallet (or vice versa).
But because the space of possible addresses is so astronomically large it is more likely that the Earth is destroyed in the next 5 seconds, than that a collision occur in the next millenium.
How to create Bitcoin Address
The correct way to create a Bitcoin address is to use well tested, open source, peer reviewed wallet software. Manually handling keys has resulted in funds loss over and over again. Unlike other centralized systems losses in Bitcoin are usually unrecoverable.
Here is a brief overview of how address generation works, for informational purposes:
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0 - Having a private ECDSA key
1 - Take the corresponding public key generated with it (33 bytes, 1 byte 0x02 (y-coord is even), and 32 bytes corresponding to X coordinate)
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2 - Perform SHA-256 hashing on the public key
3 - Perform RIPEMD-160 hashing on the result of SHA-256
4 - Add version byte in front of RIPEMD-160 hash (0x00 for Main Network)
(note that below steps are the Base58Check encoding, which has multiple library options available implementing it)
5 - Perform SHA-256 hash on the extended RIPEMD-160 result
5 - Perform SHA-256 hash on the extended RIPEMD-160 result
6 - Perform SHA-256 hash on the result of the previous SHA-256 hash
7 - Take the first 4 bytes of the second SHA-256 hash. This is the address checksum
![How Does Private Key Generate Public Key Address Mew How Does Private Key Generate Public Key Address Mew](/uploads/1/3/4/4/134408001/447131362.jpg)
8 - Add the 4 checksum bytes from stage 7 at the end of extended RIPEMD-160 hash from stage 4. This is the 25-byte binary Bitcoin Address.
9 - Convert the result from a byte string into a base58 string using Base58Check encoding. This is the most commonly used Bitcoin Address format
See Also
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Retrieved from 'https://en.bitcoin.it/w/index.php?title=Technical_background_of_version_1_Bitcoin_addresses&oldid=66297'
Several tools exist to generate SSH public/private key pairs. The following sections show how to generate an SSH key pair on UNIX, UNIX-like and Windows platforms.
Generating an SSH Key Pair on UNIX and UNIX-Like Platforms Using the ssh-keygen Utility
UNIX and UNIX-like platforms (including Solaris and Linux) include the ssh-keygen utility to generate SSH key pairs.
To generate an SSH key pair on UNIX and UNIX-like platforms using the ssh-keygen utility:
- Navigate to your home directory:
- Run the ssh-keygen utility, providing as
filename
your choice of file name for the private key:The ssh-keygen utility prompts you for a passphrase for the private key. - Enter a passphrase for the private key, or press Enter to create a private key without a passphrase:Note:You can make PDFs from scanned documents or instantly turn paper text into editable documents, get a text from images, compare and annotate PDFs, secure and sign PDFs, and move PDF to any format like Microsoft Word, Excel, PowerPoint, HTML, Text and more. Adobe acrobat 7.0 professional key generator free download. It provides a total and dependable solution to execute various PDF document administration tasks without exemption. If you are the developer then you need.Adobe Acrobat Pro DC 2020 Serial Key is the world’s greatest PDF program that lets you make PDF files from reading documents, as well as generate PDF files from different office documents, images or vice versa.While a passphrase is not required, you should specify one as a security measure to protect the private key from unauthorized use. When you specify a passphrase, a user must enter the passphrase every time the private key is used.Generate keys. In Windows, use PuTTYgen to generate your public and private keys. If needed, download PuTTYgen from the PuTTY download page. (PuTTYgen might have been installed previously with PuTTY or WinSCP.) Launch the program, and then click the Generate button. The program generates the keys. PuTTYgen is an key generator tool for creating SSH keys for PuTTY. It is analogous to the ssh-keygen tool used in some other SSH implementations. The basic function is to create public and private key pairs. PuTTY stores keys in its own format in.ppk files. However, the tool can also convert keys to and from other formats. Generate rsa key windows putty.The ssh-keygen utility prompts you to enter the passphrase again.
- Enter the passphrase again, or press Enter again to continue creating a private key without a passphrase:
- The ssh-keygen utility displays a message indicating that the private key has been saved as
filename
and the public key has been saved asfilename
.pub
. It also displays information about the key fingerprint and randomart image.
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Generating an SSH Key Pair on Windows Using the PuTTYgen Program
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The PuTTYgen program is part of PuTTY, an open source networking client for the Windows platform.
To generate an SSH key pair on Windows using the PuTTYgen program:
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- Download and install PuTTY or PuTTYgen.To download PuTTY or PuTTYgen, go to http://www.putty.org/ and click the You can download PuTTY here link.
- Run the PuTTYgen program.
- Set the Type of key to generate option to SSH-2 RSA.
- In the Number of bits in a generated key box, enter 2048.
- Click Generate to generate a public/private key pair.As the key is being generated, move the mouse around the blank area as directed.
- (Optional) Enter a passphrase for the private key in the Key passphrase box and reenter it in the Confirm passphrase box.Note:While a passphrase is not required, you should specify one as a security measure to protect the private key from unauthorized use. When you specify a passphrase, a user must enter the passphrase every time the private key is used.
- Click Save private key to save the private key to a file. To adhere to file-naming conventions, you should give the private key file an extension of
.ppk
(PuTTY private key).Note:The.ppk
file extension indicates that the private key is in PuTTY's proprietary format. You must use a key of this format when using PuTTY as your SSH client. It cannot be used with other SSH client tools. Refer to the PuTTY documentation to convert a private key in this format to a different format. - Select all of the characters in the Public key for pasting into OpenSSH authorized_keys file box.Make sure you select all the characters, not just the ones you can see in the narrow window. If a scroll bar is next to the characters, you aren't seeing all the characters.
- Right-click somewhere in the selected text and select Copy from the menu.
- Open a text editor and paste the characters, just as you copied them. Start at the first character in the text editor, and do not insert any line breaks.
- Save the text file in the same folder where you saved the private key, using the
.pub
extension to indicate that the file contains a public key. - If you or others are going to use an SSH client that requires the OpenSSH format for private keys (such as the
ssh
utility on Linux), export the private key:- On the Conversions menu, choose Export OpenSSH key.
- Save the private key in OpenSSH format in the same folder where you saved the private key in
.ppk
format, using an extension such as.openssh
to indicate the file's content.