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Also, make a back-up of your revocation certificate on your local machine. Ideally, you should backup your key (encrypted with your passphrase by default) both in the cloud and on your local machine. Do you have an encrypted backup of your secret key material?.– Your OpenPGP keys should have a reasonable expiration date (no more than 2 years in the future) Additional suggestions for OpenPGP encryption best practices – Your OpenPGP keys should be DSA-2 or RSA (RSA preferred), ideally 4096 bits or more. If you have generated your private key using Mailfence, do not worry about these points, they do not apply to you: On condition that you still have access to the private key. However, a revoked key can still be used to verify old digital signatures, or decrypt data. Doing this will notify others that you revoked the key. A better approach is to activate your revocation certificate by publishing it on Public key servers. In case you forget your passphrase or if your private key is compromised or lost, the only hope you have is to wait for the key to expire (this is not a good solution). It’s best to setup a calendar event in your Mailfence calendar that will remind you at the right time to extend your OpenPGP key expiration date.Īgain, you can always extend your expiration date even after it has expired! You do not need to make a brand new key, you just need to extend your expiration to a later time. Set a calendar event to remind you about your expiration date If you have access to the secret key material, you can prevent the expiration. You can always extend your expiration date, even after it has expired! This “expiration” is actually more of a safety valve that will automatically trigger at some point. Why? The point is to setup something that disables your key in case you lose access to it or if it has been compromised (and you have no revocation certificate). Users generally don’t want their keys to expire, but there are good reasons to let them. But if you’re planning to generate your private key using an external tool – then make sure it is either 2048 or 4096 bit-length. Mailfence by default generates 4096bit RSA key. Many of these changes may require you to generate a new key.
Best pgp encryption site how to#
Now that you know how to receive regular key updates from a well-maintained key server, you should make sure that your OpenPGP key is optimally configured. The more channels that host your PGP key fingerprint, the harder it is for Eve to attack them all. Just ensure that your public is verifiable through multiple channels, for example: social media, public mailing lists, key servers, etc. This will protect you from all mainstream key-exchange attacks. Tell all correspondents to use your public key to contact you and include their public key in the encrypted body of the message. You can deniably exchange keys by having an easily available and identifiable public key. If possible, perform deniable key exchange!
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Mailfence allows you to achieve this by simply clicking on “ update from public server” on any imported public key that you have in your keystore. If you don’t update the public keys in your key store, then you do not get timely expirations or revocations – both of which are very important to be aware of.
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Verify the fingerprint first, before importing it.Īlways check a given OpenPGP public key via its fingerprint.Įven 64 bits long OpenPGP Key IDs (for e.g., 0x44434547b7286901 –) probability of collision is potentially a very serious problem.
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It is recommended that you should do this verification in real life or over the phone.
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You should therefore verify with the owner the full key fingerprint of their key. Do not blindly trust keys from public serversĪnyone can upload keys to public key servers and there is no reason that you should trust the given relationships (the association between the email ID and the public key).OpenPGP encryption is no exception and you must follow a few good practices to make it more secure. This blogpost will provide you with a concise list of OpenPGP encryption best practices. Strong encryption is no longer a privilege of geeks and paranoids but is becoming mainstream. However, true end-to-end encryption is not out-of-the-box and generally requires you to activate a number of switches as described in this post about Instant Messaging.