PGP is short for "Pretty Good Privacy". It is a data encryption and decryption computer program that provides cryptographic privacy and authentication for data communication. PGP is often used for signing, encrypting and decrypting texts, E-mails, files, directories and whole disk partitions to ...

learn more… | top users | synonyms

3
votes
1answer
913 views

Key generation: Differences between GnuPG classic, stable, modern?

I plan to create a 4096 bit RSA&RSA key pair: gpg --gen-key --personal-digest-preferences SHA512 --cert-digest-algo SHA512 Is there any difference in generated key quality between versions 1.4 ...
2
votes
1answer
68 views

Upgrading OpenPGP public key on key servers?

What is the best way to upgrade an OpenPGP key that was created 11 years ago? It's 1024-bit and is published on the key server. I can create a new key, but what's the proper way to update the ...
3
votes
3answers
984 views

Two-way PGP email without publishing your key / address to a key server?

If I want to have some privacy and avoid the attention of publishing my email address to the public key server web of trust, yet have a secure two-way email conversation with one recipient, what are ...
2
votes
1answer
168 views

Is it safer to use a PGP key encrypted with a password than just the same password separately?

I'd like to encrypt some master passwords that I want to store with added security outside of KeePass, instead as just a normal record in the database. I was considering storing these passwords in an ...
0
votes
1answer
573 views

How do I import a GnuPG private PGP key into Symantec PGP commandline?

I am trying to import a private PGP key into Symantec PGP command line that originated in GnuPGP (1.4.11 AIX) into a Windows system. When I do a pgp --import private.asc, then do a pgp --list-keys ...
4
votes
2answers
289 views

What exactly is a subkey?

I fairly understand the math behind RSA, Elgamal, AES, SHA but not how things are used in practise. How are subkeys different from master key? I understand its purpose from various websites but How is ...
1
vote
3answers
257 views

How to avoid identity theft at key signing parties?

Let me begin by distinguishing two kinds of identity theft: Conventional identity theft (e.g. using credentials from ID documents, bank accounts, etc, to commit fraud or other mischief). ...
1
vote
1answer
103 views

Necessary components for PGP [closed]

I came across this question during an interview. I was asked: What are the two main components of PGP encryption necessary for it to work? I was thinking in line of Private and Public Keys but I am ...
25
votes
6answers
5k views

What real world benefits does PGP have over sending email with SSL/TLS such as with HTTPS?

I've been learning about PGP, and I asked myself, "Why?" For example, if I'm using https://mail.google.com, then what benefit would adding PGP offer that would justify it being used? I can ...
1
vote
2answers
1k views

Encrypt files on FTP server

I have a practical situation here, my company is a FTP server provider for some clients. The clients are sharing their files on our FTP server and have had no problem with access management and ...
4
votes
1answer
696 views

What is an OpenPGP Key ID collision?

Recently an Evil32 project group announced that they have found collisions for all OpenPGP keys from public keyservers (https://evil32.com/). What does the term collision refer to?
2
votes
1answer
151 views

Why can't I upload a new ECC key to key servers, which is supported by GnuPG 2.1?

My OpenPGP key is soon to expire so I wanted to create a new one. GPG 2.1 came out a month ago including ECC support and I wanted to try the new key types. So I have generated a brand new ed25519 ...
3
votes
1answer
175 views

What is 0xXXXXXXXX.asc.sig and how can I generate this?

When I am exchanging PGP keys with someone, I receive the regular 0xXXXXXXXX.asc file and regularly receive a file called 0xXXXXXXXX.asc.sig. What is this file? How can I generate one and send it ...
6
votes
1answer
911 views

What is the “PGP Global Directory Verification Key”?

In the server keys of the MIT, there is several signatures from "PGP Global Directory Verification Key". Example (from http://pgp.mit.edu/pks/lookup?op=vindex&search=0xB63024F96C73DA99): sig ...
2
votes
2answers
358 views

GPG Web-of-Trust Level [duplicate]

(and really sorry for my english) I have a question about Web-of-Trust of GPG. Let's say A and B signed each other's public keys and B and C signed each other's public keys. In this case A can trust ...
7
votes
1answer
81 views

User IDs containing URIs

When adding a User ID to your OpenPGP key, you are typically asked (for example by GnuPG) to provide a name, a comment, and an email address (where each part is optional). This format (Name (Comment) ...
8
votes
1answer
6k views

New PGP key: RSA/RSA or DSA/Elgamal?

I wanted to create a new PGP key using GPG Keychain Access on my Mac. One of the options was to choose keytype: RSA and RSA DSA and Elgamal RSA (Sign only) DSA (Sign only) I found this Superuser ...
4
votes
1answer
179 views

Why are PGP signatures not more widely used as an authentication method?

Example: Bob generates a key pair for this example. Bob registers at example dot com where he provides his public key. When Bob will try to log in, example dot com will ask him to sign a random ...
3
votes
1answer
794 views

Wrapping my head around Protonmail

I've been trying to grasp how Protonmail could work. From what it gather, it works like this: When you signup, you create an account password and a mailbox password. A PGP private/public key pair is ...
1
vote
2answers
126 views

Using PGP to encrypt emailed password reset token

Even if I am careful not to lose/forget my password for some web account, other people are not and so most sites have a password reset mechanism, often being a reset token sent to the registered email ...
2
votes
2answers
215 views

Distributing public keys; with or without a sub-key?

Most of the public keys I am getting from friends have a sub key in addition to the pub key. For educational purposes I retrieved some public keys and came across this Linus Torvalds' key that does ...
0
votes
1answer
73 views

What are valid OpenPGP revocation signature types?

I'm working on an analysis of the full OpenPGP keyring (ca. 3.8 million keys). I imported all keys to a local instance of hockeypuck (keyserver implemented in go). Hockeypuck uses a PostgreSQL ...
1
vote
2answers
201 views

How would you set up a ‘cold’ netbook for master-key signing, large Bitcoin transactions, etc? [closed]

I've just ordered a cheap-o netbook on Amazon, with the intention of installing a Linux distro, and turning it into a permanently-offline high-security machine for sensitive tasks. However, I'm no ...
2
votes
1answer
71 views

What is validity in terms of PGP 6.5.8?

In PGP 6.5.8, there is a concept of "validity" for a key, and it shows in the user interface for each key on the keyring. What is this concept, and how to you set it so a key is considered valid?
2
votes
3answers
1k views

What is the difference between a key algorithm and the encryption algorithm?

I just starting to learn about PGP encryption. One thing that confuses me is the difference between a key algorithm, and an encryption algorithm. For example, lets say I have a trading partner (EDI ...
20
votes
7answers
4k views

Putting my PGP ID/link on printed business cards

I'm going to print some business cards, and along with my email address I was thinking of putting my PGP ID on it as well. After doing some research I found that using the short ID is not a good ...
1
vote
1answer
315 views

What is the difference between “unknown” and “undefined” trust?

When you trust a GnuPG key, you can choose one of these five options (and I'm assuming the same options exist in other OpenPGP tools): 1 = I don't know or won't say (undefined) 2 = I do NOT ...
3
votes
2answers
1k views

What is the difference between “full” and “ultimate” trust? [duplicate]

When you trust a GnuPG key, you can choose one of these five options (and I'm assuming the same options exist in other OpenPGP tools): 1 = I don't know or won't say (undefined) 2 = I do NOT ...
3
votes
2answers
284 views

Is the PGP Web of Trust / Keyserver infrastructure permanently broken?

I love the idea of decentralized trust, the web of trust, and the fact that anyone can run their own keyserver and isn't beholden to a centralized point of failure. But does the decentralized ...
1
vote
0answers
108 views

Secure self-concealing symmetric encryption (non-verifiable decryption)?

From what I observed using standard encryption tools such as OpenSSH and GPG, the decryption only succeeds when the correct password/key is provided (or at most a few others, in case of collision). ...
2
votes
1answer
419 views

Is it necessary to remove the primary secret GPG key from your laptop if it has full-disk encryption?

According to a number of articles, e.g. "Creating the Perfect GPG Keypair," it is advisable to have a number of subkeys in your GPG key, one for encryption, and one for signing, and then to (a) back ...
4
votes
2answers
263 views

How to properly transition from standard PGP keys to using subkeys?

When I initially set up PGP, PGPTools didn't prompt me to create separate subkeys, as explained in the article "Creating the Perfect PGP Keypair". Now that I've learned a bit more about PGP, I'd like ...
2
votes
3answers
399 views

GPG keys & SHA-1

I've heard that SHA-1 hashing is becoming less secure, and that most GPG keys are secured with SHA-1. Is there a way to determined if SHA-1 is in my GPG key, and what to do if this is the case?
3
votes
2answers
459 views

Does adding multiple recipients to an encrypted message decrease security?

Let's say you want to send the same GPG/OpenPGP encrypted message to 50+ recipients. Assuming everyone you send to is trusted, and there is no risk of any recipient leaking their secret key, is ...
2
votes
1answer
138 views

Which PGP settings have been found to be vulnerable?

Digging through articles, one often finds recommendations such as "Use the default key type/size X", whereas an article written a few years later will write "Key type/size X has been found to be ...
2
votes
1answer
496 views

GnuPG / OpenPGP: How to eliminate redundancy in PGP private key?

I examined a few randomly generated private keys generated by Gnu PG, and found a lot of redundancy. It is enclosed by -----BEGIN PGP PRIVATE KEY BLOCK----- and -----END PGP PRIVATE KEY BLOCK----- ...
1
vote
3answers
361 views

Adding a “comment” to PGP mail signature files?

I have started signing my mail with PGP, and it attaches the file signature.asc to my messages to verify that I sent them with content, as you'd expect, like this: -----BEGIN PGP SIGNATURE----- ...
1
vote
1answer
123 views

What happens if my signing subkeys are compromised?

Let's say my subkeys are compromised, but my master keypair is safe and secure, so I revoke the old subkeys and issue new ones. With encryption keys, the results are pretty clear: I can still decrypt ...
6
votes
1answer
427 views

How long do keys stay on keyservers?

Do GPG/PGP keyservers "garbage collect" old keys which have expired, been revoked, or simply haven't been updated in a decade? Or does the server (theoretically) keep every key it has ever seen from ...
3
votes
1answer
220 views

Will PGP signed email be blocked in China?

I generally sign all of my outgoing email with PGP. I don't usually encrypt it because most people I send mail to don't have a public key. Anyway, if I send an unencrypted message with a PGP signature ...
5
votes
3answers
274 views

What are you saying when you sign a PGP key?

When you sign a PGP/GPG key, what exactly are you saying to everyone who sees your signature? Are you validating the person, or the email address? To explain what I mean, take the following two ...
29
votes
3answers
3k views

Tell people that I can encrypt emails

I know that it is still not very easy to use PGP for an average user. However, the situation is improving (there are some easy plugins that can even nicely integrate into your GMail webmail). In ...
0
votes
2answers
170 views

Can I generate multiple PGP key pairs for later use

I was just wondering if I can generate couple of PGP key pairs and save them for later use or backup. In addition can I be sure that other wont generate and use some of my key pairs in the meantime. I ...
1
vote
3answers
322 views

How can an email sender include his PGP key, so I can answer with an encrypted mail?

Let's say I were to post my e-mail address and public PGP key to my website. When a client contacts me, they would have to include their PGP public key in the e-mail so that I can respond to them in ...
2
votes
2answers
79 views

Can the GPG master secret key be stored as read-only?

Once you have generated your master PGP key, will the "data" in the private key ever change? For instance, if you add another subkey, uid, or any other data to the master key, do these changes need ...
6
votes
3answers
301 views

Why can't PGP/GPG Web-of-Trust be automated?

We heard lots of complaints about hard to use crypto tools, and recent ideas of Google how to fix this. I had another idea about this which seems quite obvious, but couldn't find anything about it on ...
2
votes
1answer
3k views

Are SSH keys and PGP keys the same thing?

I have a 3072 bit RSA key that I generated for use with SSH. Can this key-pair be used with PGP/GPG, or do I need to generate a new pair of keys separately for use in email encryption? Are the two ...
2
votes
2answers
217 views

How can I secure my api to avoid copying?

Im building an app which should receive data from my server. The Api should be a PHP based script which provides the data as JSON. However I want to keep the data private and it should only be ...
4
votes
2answers
1k views

How to Conceal/Detect PGP Symmetric Algorithm Used

When Symmetrically encrypting a file, (not signing, not an asymmetric encryption question), is it possible to conceal the encryption algorithm used, or is it already concealed, but just showing on ...
0
votes
1answer
113 views

Keep OpenPGP revocation certificate in safe place?

Do I have to keep the revocation certificate of my OpenPGP key in a safe place or may I place it in e.g. Dropbox to have it ready on all my machines? I know that, if compromised, the certificate can ...