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 ...

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3
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1answer
103 views

Is there an actual use for OpenPGP authentication keys?

The OpenPGP specification (RFC 4880) describes, page 34, the different capabilities that an OpenPGP key may have; including: 0x20 - This key may be used for authentication. In GnuPG, one of the ...
66
votes
5answers
10k views

What was so dangerous about PGP that its creator was charged in court for it?

I was reading up on the history of the PGP encryption software when I realised its creator was under criminal charges for munitions export without a license for releasing the source code of PGP. ...
1
vote
3answers
164 views

OpenPGP Master Key Size

Currently the default maximum key size is 4096. I know this can be changed by recompiling the software, and I don't mind doing that. My problem is about compatibility issues. It makes sense that some ...
2
votes
0answers
70 views

Threats against website running without TLS but with PGP messages

Are there any threats against a web site that isn't running SSL but uses PGP to encrypt all information to the server (except session identifier) The information flow is as such: 1. Session ID set on ...
2
votes
0answers
177 views

PGP-encrypted Email or SSL/TLS Webform for Responsible Disclosure Communication?

So it's a fairly simple question. When offering an avenue to security researchers for communication with us regarding disclosure of security vulnerabilities, what's the best way to do so? Assume we ...
0
votes
2answers
48 views

How can I verify the GPG signature is valid?

I'm trying to figure out if there is a way to be 100% sure that a GPG signature is valid. I'm not entirely sure how it all works, or the correct terminology, so forgive any lack of understanding. I ...
5
votes
2answers
94 views

Does RNG play a role in PGP signing?

We have a Jenkins system that builds and PGP-signs software releases, and we are considering moving the signing component to an isolated VM instead of running it as part of the overall builder ...
2
votes
4answers
158 views

Can I use elliptic curve DSA in a secure message service?

I'm looking to design a system that allows a user of a crypto-coin such as Bitcoin to both have an online wallet and to be able to send and receive encrypted emails in the same system. The relevant ...
1
vote
2answers
229 views

How to maintain security and trust with a PGP keypair for a team or group of people?

I've seen many instances where a company or organization generates and uses a PGP keypair for a team or group of people. Most likely they all have a copy of the private and public keys on their ...
2
votes
2answers
170 views

If I change my private key PGP passphrase, will the old private key+old passphrase work to decrypt already encrypted data?

Suppose I have a script that contains my PGP private key in plain text and requires me to manually type in the key passphrase to decrypt some data. Later, I decide that my passphrase is compromised ...
2
votes
1answer
159 views

Should generating gpg keys ever result in an identical key to an older key?

I recently had a situation where I lost an old private key (write error; realized this too late). In regenerating keys and replacing the public keys on various sites, I noticed that the public keys ...
2
votes
1answer
275 views

Which mail clients support PGP/MIME - is there an overview? [closed]

Does anyone know if there is a current overview (I only found ones from before 2006) which MUAs (mail clients) do support PGP/MIME? I wonder whether there still exist issues like "Outlook Express ...
4
votes
1answer
39 views

PGP keys varying only in attached signatures

Here is a few questions revolving around the same core problem. Let's say I generate a PGP keypair. I now get the keypair signed by person A at signing party X. In the evening, I give my now-signed ...
0
votes
1answer
62 views

Is a PGP revocation certificate sensitive?

In relation to an openpgp key on a smartcard: Besides revoking the key, is there anything else it can be (ab)used for? Can I just ensure it's reliably stored but not worry about it's confidentiality? ...
2
votes
2answers
88 views

What to do if you ever lose a smart card?

I want to use an OpenPGP smart card for signing releases, but I'm not sure what to do if I ever lose the card or it breaks. My idea is to generate the key using GnuPG on an isolated computer, ...
0
votes
1answer
74 views

Use same PGP key for private and business mail addresses [duplicate]

I'm asking myself which one is better: Use the same PGP key pair for use with both private email addresses and business email addresses Use two separate PGP key pairs, one for private and one for ...
3
votes
2answers
116 views

The best way to change my pgp key

I would like to change my pgp key because I have the same one 2 years ago. But, I want to warn my freinds that the owner of the old key and the owner of the new one is the same person (me). hwat is ...
7
votes
3answers
2k views

How (in)secure is POP/IMAP/SMTP

I'm making a few assumptions about basic email security, and I want to confirm or clarify some of these points to make sure I understand the big picture. Please correct me where I'm mistaken: The ...
1
vote
1answer
284 views

Pgp Private key storage on windows server advice

Looking for a bit of advice really, here's the situation: I currently have a security minded client who will be sending PGP encrypted files. I have to decrypt the files on my server before ...
0
votes
1answer
74 views

One public key contains all subkey?

I've created a keypair with gpg2 --gen-key Then I created a subkey only for sign. If I clearly understand the process I have now 3 pub/priv pairs. The master, one for encrypt and one for signing. I ...
2
votes
1answer
190 views

Extracting the GPG userid from the Public key file?

Is it possible to extract userid from GPG public key? I got public key only and want to know to whom it might belong. I find one possible workaround — to publish this information on keyserver — it ...
2
votes
2answers
96 views

Are OpenPGP Robot key signers useful?

I've been thinking about building a web-based keysigning robot. Mostly I want to do this to dip my toes back into working with PGP after quite a few years of ignoring it. The robot I have in mind ...
3
votes
1answer
310 views

How can I recover a GPG private key from a PC which has died? [closed]

Long story short - PC with kleopatra processor died, and I only have a backup of my public key. I've gone into the HDD and tried to re-jig kleopatra in the hope it would remember everything for me on ...
4
votes
3answers
591 views

What is the most secure way to send emails using PGP?

I am a PGP beginner, having just downloaded GPG for OS X. I created my first pub/sec key for my email address and uploaded it to the public key server. GPG has several features available, namely: 1) ...
1
vote
1answer
305 views

OpenPGP keyserver URLs: what are typical or meaningful use-cases?

i'm getting re-acquainted with OpenPGP and noticed that GnuPG allows me to store a "preferred keyserver" URL in my keys: reuben@localhost:~$ gpg2 --edit-key 'Reuben NP Garrett ...
0
votes
1answer
292 views

Given a Gnupg Public / Private key pair, how can I identify the strength of the encryption used?

I have been using a key pair at home with gpg command line tool on Ubuntu, to encrypt password text files for a few years now. I no longer have any record of the type of encryption and bit length used ...
7
votes
1answer
197 views

Which signing key should I use for certifying other peoples public keys: master or subkey?

I have a Master Identity key (which is detached from my daily-use keyring) and both encryption and signing subkeys (all are RSA). I sign documents with the signing subkey: GnuPG selects this key ...
5
votes
1answer
328 views

Is is typical to create both x509 and OpenPGP key pairs?

I'm looking into increasing my use of signed and encrypted "things" - LibreOffice Documents, Off-the-record chat, PDFs, emails, etc. I'm finding that some things only support x509 format-certificates, ...
3
votes
6answers
218 views

Does an email signature increase security?

I'm using Thunderbird with Enigmail. It has both encrypt and sign options for sending PGP emails -- but why is an email signature needed? It just looks overkill to me! Alice and Bob can use PGP to ...
-1
votes
1answer
111 views

Would PGP/GPG have been a better choice than SSL for browsers and http servers to encrypt traffic? [closed]

I was curious recently when I heard that SSL had supposedly been broken by a certain rogue government agency, why SSL was chosen in the first place. Could it be that PGP would have been a more secure ...
2
votes
1answer
84 views

Can I ask GPG keyservers to name all keys signed by a particular key?

Given the alleged possibility that an adversary might attempt to acquire my (OFFLINE) Secret Certification Key and Passphrase and sign other keys with it, including a key they made with my ...
3
votes
2answers
311 views

What is the purpose of 'Version:' in PGP public key

PGP public keys look something like -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.9 (GNU/Linux) mQGiBEl2HAgRBAC9IZGQE3NRWFoXV7CcVRbo7xMe+nGPRMTOocA0pcv9N67R6CAZ ... -----END PGP PUBLIC ...
3
votes
2answers
820 views

What trust level should I give keys I need for encryption?

As I'm encrypting server backups, I typically install my public GPG key from a keyserver into me server's keyring: gpg --search-keys 6569758F I import the key into my keyring. I then attempt to ...
1
vote
1answer
84 views

Getting more users to use PGP [closed]

Does anyone know of browser Plugins that make Composing, sending, and reading email basically effortless? Mailvelope doesn't seem to be working with the floating compose boxes in Gmail currently. ...
2
votes
2answers
349 views

GPG good signature but Warning: untrusted signature

I'm having an issue with some of my clients being unable to open email attachments when I sign the messages. The error they get is something like (free translation): Error: cannot open. The ...
5
votes
2answers
401 views

Trustworthy Android recovery image that allows rooting?

I have an unlocked but not rooted Android device (Nexus 7 2013 WiFi "flo", legitimately unlocked using fastboot oem unlock from an x86 computer). Neither adb root nor adb shell followed by su let me ...
-2
votes
2answers
178 views

What was the Lavabit's backdoors to their customers' e-mails? [closed]

There has been some talk about the Lavabit's case. New info was published today, but not important. I'd like to know how Lavabit worked. First I thought they just did something with OpenPGP. Then I ...
1
vote
2answers
149 views

PGP: Including your public key as a recipient? Any less secure?

I understand that when I send a message to my friend Bob using his public key, it's a 1 way encryption. However, if I add my own public key to the list of recipients, it allows me to later decrypt ...
2
votes
1answer
308 views

Why is compression done between hash function and encryption in pgp?

What are services of pgp? How is compression performed between hash function and encryption? How it can be applied in reality?
1
vote
2answers
686 views

What's the limit on the size of the data that public-key cryptos can handle?

Someone mentioned here that asymmetric encryption might not be appropriate for bulk data and gave an example of RSA with 100 bytes. Of course, I understand that it was a rough example. But it made me ...
5
votes
3answers
1k views

Is it possible to use a GPG or SSH key for web based authentication in a secure fashion?

Let's say hypothetically I am writing a web application targeting technically inclined, security-conscious users who have no problems generating and using GPG or SSH keys. Is it possible to use said ...
1
vote
1answer
473 views

Additional security for WebRTC/DTLS-SRTP with PGP?

I am having a thought experiment. Can you help me? Two clients who both use PGP. They initiate a WebRTC call using DTLS-SRTP via a 3rd party server. Is there any benefit of encrypting, via their ...
1
vote
1answer
326 views

Why are the first 16 bits of the message digest not encrypted in PGP? [closed]

The first 16 bits of the message digest in a PGP signature are translated in the clear. As we know, sending something in clear text does not sound like a very good idea from a security point of view. ...
3
votes
2answers
409 views

Why would someone create an OpenPGP public key with my name and email address?

By chance, I typed gpg2 --search myemailaddress on the command line, and searched public keyservers for my email address (I'd actually just meant to search my local keyring, for which I should have ...
7
votes
1answer
1k views

PGP - Why have separate encryption subkey

This is how my key is set up: pub 4096R/AAAAAAAA created: 2012-11-14 expires: 2013-11-14 usage: SC trust: ultimate validity: ultimate sub 4096R/BBBBBBBB created: ...
7
votes
4answers
598 views

Is it safe for GPG to compress all messages prior to encryption by default?

By default, GPG compresses text during encryption. Additionally, RFC 4880 says: 2.3. Compression OpenPGP implementations SHOULD compress the message after applying the signature but before ...
2
votes
2answers
1k views

Extracting the PGP keyid from the Public key file?

is there a way via an CLI tool or some kind of API to extract the PGP KEY ID from the PGP PUBLIC KEY BLOCK ? I did find the hexa value of the key in the binary file, however I guess the position is ...
6
votes
4answers
839 views

Can a PGP private key be deduced if the email text is known?

Suppose I send a PGP-encrypted email to person A, and the same email (same subject line, same message text) unencrypted to person B. Suppose a secret service intercepts both messages. The secret ...
0
votes
1answer
132 views

How to fetch and update all my friend's keys? [closed]

Where can I upload a list of my friends and get a list of their keys found on keyservers? Here are some key servers: http://keyserver.ubuntu.com:11371/ http://pgp.mit.edu/ ...
6
votes
3answers
484 views

What can a web application developer do to protect user information from powerful adversaries like the NSA or China

Some well funded intelligence services with potentially untrustworthy employees intercept and store encrypted data for years, in hopes of cracking it with future technology. What can I do to make this ...