Create a DKIM TXT record
Domain Keys Identified Mail (DKIM) helps you protect your company fromemail spamming and phishing attempts. It provides a method forvalidating a domain name identity that is associated with a messagethrough cryptographic authentication.
Generating keys using OpenSSL There are two ways of getting private keys into a YubiKey: You can either generate the keys directly on the YubiKey, or generate them outside of the device, and then importing them into the YubiKey. To generate a DKIM key with openssl, do the following - this will generate you a 1024 bit DKIM key: openssl genrsa -out private.key 1024 openssl rsa -in private.key -pubout -out public.key Your generated public key will remind something like below. DKIM (DomainKeys Identified Mail) Quick Start. DKIM Public/Private Key-pair Generation: download TLS/SSL Toolkit. Extract OpenSSL.exe into a direcory of your choice. In a DOS box type. DKIM (DomainKeys Identified Mail) Signing: select Options-DKIM-Sign and create a new record.
For a complete description of DKIM, see the link to recommended DKIM sitesin the “External resources” section at the end of this article.
Note: The method described in this article differs from the way DKIM isset up for Rackspace Hosted Email and Exchange customers. If you are aRackspace Email, Hosted Exchange, or Office 365 customer, contact theRackspace Cloud Office team for help configuring the proper DKIM, DMARC, andSPF records.
The process of setting up DKIM involves the tasks detailedin the following steps:
Choose a DKIM selector.
Generate a public-private key pair.
Publish the selector and public key by creating a DKIM TXT record.
Attach the token to each outgoing email.
What is a DKIM selector?
A selector is specified as an attribute for a DKIM signature and is recorded in the DKIM-Signature header field.
Because DKIM selectors give different DNS query names, the system uses the selector as an additional name component for validation. Under each domain name, there might be one too many unique DKIM DNS records associated with different selectors.
Selectors enable multiple keys under a domain name, which can provide separate signatory controls among departments, date ranges, or third parties acting on behalf of the domain name owner. No two services or products should use the same selector.
A selector can be anything you want, such as a word, number, or a string of letters and numbers.
Home standby generators are the most powerful generator types. They automatically detect outages and can provide power to an entire home with minimal interruption during a storm or outage. Generators by Wattage Before choosing a generator, the most important thing to consider is wattage. Cs 1.3 key generator. Another generator type is a backup generator. These generators require manual standup, but their wattage is enough to power select appliances.
For example, if you choose oct2019 for your selector, the domain name wouldbecome oct2019._domain.example.com.
Before you begin
Before you log in to the control panel and create a DKIM record, there area couple of things that you need:
Choose a simple, user-defined text string to be your DKIM selector. Theselector is appended to the domain name to help identify the DKIM publickey. See the previous section for more information about choosing aDKIM selector.
Generate a public-private key pair by using a tool such as ssh-keygen onLinux or PuTTYgen on Windows. For help creating key pairs, seeGenerate RSA keys with SSH by using PuTTYgen.
Create a DKIM TXT record
Use the following steps to create a DKIM TXT record in the Cloud ControlPanel:
Log in to the Cloud Control Panel.
In the top navigation bar, click Select a Product > Rackspace Cloud.
Select Networking > Cloud DNS.
Click the gear icon next to the name of an existing domain andselect Add DNS Record.
In the pop-up dialog box, select TXT Record as the record type.
In the Hostname text box, enter the selector text string that you chosein Step 1, followed by the literal string
._domainkey. For example, if youuse the default as the text string, you enterdefault._domainkeyin theHostname text box.Expand the Text box by dragging the corner, and then enter thefollowing information, pasting the public key that you generated in theprevious section after the
p=prompt:When you finish, the TXT record looks similar to the followingexample:
Click Add Record.
The DKIM TXT record is added to your domain.
For instructions about attaching the token to your outgoing email, see theSpecification section at DKIMcore.org.
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External resources
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While Encrypting a File with a Password from the Command Line using OpenSSLis very useful in its own right, the real power of the OpenSSL library is itsability to support the use of public key cryptograph for encrypting orvalidating data in an unattended manner (where the password is not required toencrypt) is done with public keys.
The Commands to Run
Generate a 2048 bit RSA Key
You can generate a public and private RSA key pair like this:
openssl genrsa -des3 -out private.pem 2048
That generates a 2048-bit RSA key pair, encrypts them with a password you provideand writes them to a file. You need to next extract the public key file. You willuse this, for instance, on your web server to encrypt content so that it canonly be read with the private key.
Export the RSA Public Key to a File
This is a command that is
openssl rsa -in private.pem -outform PEM -pubout -out public.pem
The -pubout flag is really important. Be sure to include it.
Next open the public.pem and ensure that it starts with-----BEGIN PUBLIC KEY-----. This is how you know that this file is thepublic key of the pair and not a private key.
To check the file from the command line you can use the less command, like this:
less public.pem
Do Not Run This, it Exports the Private Key
A previous version of the post gave this example in error.
openssl rsa -in private.pem -out private_unencrypted.pem -outform PEM
The error is that the -pubout was dropped from the end of the command.That changes the meaning of the command from that of exporting the public keyto exporting the private key outside of its encrypted wrapper. Inspecting theoutput file, in this case private_unencrypted.pem clearly shows that the keyis a RSA private key as it starts with -----BEGIN RSA PRIVATE KEY-----.
Visually Inspect Your Key Files
It is important to visually inspect you private and public key files to makesure that they are what you expect. OpenSSL will clearly explain the nature ofthe key block with a -----BEGIN RSA PRIVATE KEY----- or -----BEGIN PUBLIC KEY-----.
You can use less to inspect each of your two files in turn:
less private.pemto verify that it starts with a-----BEGIN RSA PRIVATE KEY-----less public.pemto verify that it starts with a-----BEGIN PUBLIC KEY-----
The next section shows a full example of what each key file should look like.
The Generated Key Files
The generated files are base64-encoded encryption keys in plain text format.If you select a password for your private key, its file will be encrypted withyour password. Be sure to remember this password or the key pair becomes useless.
The private.pem file looks something like this:
The public key, public.pem, file looks like:
Protecting Your Keys
Depending on the nature of the information you will protect, it’s important tokeep the private key backed up and secret. The public key can be distributedanywhere or embedded in your web application scripts, such as in your PHP,Ruby, or other scripts. Again, backup your keys!
Remember, if the key goes away the data encrypted to it is gone. Keeping aprinted copy of the key material in a sealed envelope in a bank safety depositbox is a good way to protect important keys against loss due to fire or harddrive failure.
Oh, and one last thing.
If you, dear reader, were planning any funny business with the private key that I have just published here. Know that they were made especially for this series of blog posts. I do not use them for anything else.
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