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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2
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293 views

Emacs and EasyPG not performing public key encryption

I have a file which I edit and encrypt following this guide : http://emacs.wordpress.com/2008/07/18/keeping-your-secrets-secret/ I'm a noob as far as security goes and thought that the point of ...
2
votes
1answer
72 views

Remote network security option

I'm a bit confused with some different network security techniques. Say we want a secure communication with a particular mail server in a remote company network. Reading and sending mails should be ...
4
votes
3answers
572 views

Virus with PGP Encryption Preventing Virus Scan

A user reported having a virus that was causing pop up windows asking for money. When he turned on his laptop and logged into PGP encryption (whole disk) the desktop quickly showed but then a white ...
-2
votes
1answer
825 views

Cascading Encryption Algorithm using mcrypt or GnuGP

I'm trying to a cascading cipher encryption algorithm to encrypt a textfile via mcrypt. I'm essentially trying to emulate the behavior of TrueCrypt, where it can cascade two or three different cipher ...
4
votes
1answer
207 views

RFC 6637: Algorithm-Specific Fields for ECDH

I am trying to integrate RFC 6637 into Bouncy Castle C# which is more challenging as initially thought because both private key and public key have to be present to calculate the share secret: that ...
15
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2answers
810 views

Is it okay to sign a PGP key without an IRL meeting?

[PGP] can get paralyzed by excessive analness. — Phil Zimmermann Preamble I am in the process of building my own web of trust. That is, I want people (PGP users…) to be—fairly—sure that, by ...
3
votes
1answer
676 views

Recognizing PGP-encrypted disks

I am studying various disk encryption schemes (such as PGP, MS Bit Locker, BestCrypt and TrueCrypt) on my Windows OS. I am interested to know how an encrypted partition/disk/file with a particular ...
4
votes
1answer
156 views

User Groups (Circles) Inside a Web of Trust

Assume I have a universe of U users. Every user has his private key. I want to build user groups by adding a company sub key to his key set. Now users can sign his company sub key with there company ...
11
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2answers
4k views

ECC in (Open)PGP

How is with the support for ECC (Elliptic Curve Cryptography) in (Open)PGP so far? It seems that GnuPG (The GNU Privacy Guard) doesn't have an official implementation - but I did find the gnupg-ecc ...
20
votes
2answers
2k views

Will encrypting the same file with GPG and the same key produce the same ciphertext?

If I encrypt the same file twice with GPG, using the same key, will I get the same result? or is it using some random/psudeo-random segment to improve security like rsynccrypto?
3
votes
2answers
104 views

Can a good SSO protocol be built around a server signing tickets rather than validating them on demand?

CAS and its alternatives all seem to require a flow like this when one service is acting as a proxy for a user when accessing a back-end service: Service A makes a request to Service B on behalf of a ...
1
vote
2answers
90 views

Do keyservers keep logs of who adds whom to their keyrings?

Maybe it depends on the keyserver. Does that pose privacy issues?
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vote
3answers
104 views

Is connection to keyserver encrypted?

When you retrieve someone's information from a keyserver to add him to your pgp keyring, that is made through unencrypted keyservers, unless the user uploaded it to https://keyserver.pgp.com/. Even ...
1
vote
2answers
368 views

How to get the prime number of a secret key in GnuPG?

When I use GnuPG I can get a secret key saved as a file. Opening this file in a text editor I see that the key is encoded with base64. How do I find the actual prime number from the secret key? That ...
-3
votes
1answer
151 views

Does PGP key I created and uploaded have any legal value? [closed]

Suppose you done: gpg2 --gen-key ... gpg2 --keyserver pgp.mit.edu --send-keys ... Does such key have any legal meaning, e.g. to assert that it was really me that signed some message? What can be ...
18
votes
3answers
2k views

Migrating GPG master keys as subkeys to new master key

Currently I have 3 private GPG pairs which are all master keys. I want to convert these keys into subkeys for a new key pair (and keep that in the vault). I have read the following thread ...
4
votes
1answer
123 views

GPG warns about unprotected subkeys while using monkeysphere

Issuing monkeysphere subkey-to-shh-agent GPG warns me: gpg: about to export an unprotected subkey then it asks for the passphrase and everything works fine. What's the meaning of "export an ...
2
votes
0answers
220 views

User friendly PGP email [closed]

Does there exist cross-platform email handlers following these basic guidelines based on some very limited experience? Generate new key at first startup, rather than asking the user if they have an ...
25
votes
3answers
2k views

Is authentication using personal pictures more secure than passwords?

Statement 1 There is a start up called PixelPin. On the web site it reads: The PixelPin solution is simple and quick to use, yet very secure. PixelPin eliminates the traditional alphanumeric ...
10
votes
2answers
2k views

Why do PGP master keys only have a single subkey, and tie certification with signing by default?

After learning more about PGP subkeys and how to split apart the roles of (S)igning, (E)ncryption, (A)uthentication and (C)ertification, I discovered that in most cases(?) a default master key has a ...
9
votes
3answers
1k views

Anything to do about old gpg keys?

Quite A few years ago (in middle school) I created some gpg keys, published them to a keyserver, etc. because I was l33test kid on the block. Now I have gone through a few new computers and OS's, ...
5
votes
3answers
892 views

Are private keys generated by different software packages compatible?

I know that GnuPG follows the OpenPGP standard, but if I generate a public/private key pair using GnuPG and upload the public key to a key server, i.e. the one at MIT, or use it to sign files, ...
2
votes
1answer
490 views

How to change (sub)key usage of a PGP key?

gpg2 generates keys with one or several of the (S)igning, (E)ncryption, (C)ertification usages set. However, e.g. Enigmail creates a primary key also set for (A)uthentication, which GnuPG then shows. ...
10
votes
2answers
4k views

What is a good general purpose GnuPG key setup?

Since most key types can be used for multiple purposes, namely certification, authentication, encryption and signatures, one could simply use one key for everything - which is a bad idea, as ...
4
votes
1answer
240 views

Potential issues with Kim Dotcom's new proposed “encrypted webmail service”

Just spotted a Reddit thread about Kim Dotcom, of MegaUpload fame, planning to produce a secure webmail system that allows people to communicate securely, without the worry of having their messages ...
4
votes
2answers
846 views

Is it reasonable to prevent timing attacks by using fixed processing time

I have systems that perform cryptographic operations within a SSL/TLS tunnel. My concern is that I may leak timing information when encrypting, decrypting, or hashing. Part 1 Is it a good idea to ...
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2answers
2k views

gpg --perfect-code

By default gpg use CAST5 with SHA1 (not so good) as it had AES256 and hash512! Now I want to use the perfect code to encrypt my files for both symmetric & asymmetric For symmetric encryption I ...
4
votes
1answer
301 views

Apart from the lack of native Oultook support, why should one prefer S/MIME over PGP/MIME for email?

From my (still quite subjective) point of view, GnuPG/PGP is superior to SSL (or more specifically, PGP/MIME over S/MIME; maybe in other areas SSL is the better choice), e.g. due to the support of ...
3
votes
3answers
176 views

PGP keys and security contact pages

I have heard security researchers suggest that if you run a public website, you should put up a "security contact" page that includes a contact email address and your PGP public key so that people can ...
15
votes
2answers
4k views

How many GPG keys should I make?

I am learning how to use GPG keys, and I am wondering what is the threshold people generally use to maintain separate GPG keys. Maintaining an incredibly large number of keys is not good since it ...
7
votes
2answers
497 views

Why are my gpg public key on my machine and on the key server different?

When I generated my PGP key using GnuPG, I had saved the public key as an ASCII version and uploaded that to the server. Now I can see the key on the keyserver but they are different blocks of data. ...
6
votes
2answers
516 views

Recipient non-repudiation in secure e-mail transport

PGP works well to provide many key aspects of information security; message confidentiality and integrity, sender and recipient authenticity, and sender non-repudiation (the sender, who has digitally ...
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votes
1answer
103 views

GnuPG implementations are not cross-compatible? [closed]

Let's say I made my private key using Enigmail. Then I imported it into a Windows program called GPG4USB. When I want to decrypt a message it asks for my encryption password but it doesn't accept the ...
-3
votes
1answer
1k views

is there better email, file, disk encryption than PGP? [closed]

Currently, I am using Symantec's PGP desktop whole disk encryption for my Mac. After hearing that FileVault was insecure and supposedly easily crackaable. However, PGP has been around for a long ...
9
votes
1answer
1k views

GPG-encrypted mailing list and other approaches to safe communication

What is the best way to communicate privately on a mailing-list? Requiring each member of the list to have the public key of each other member, and encrypt their messages with those, is cumbersome to ...
0
votes
2answers
466 views

Network security: Public and Private keys

In Pretty Good Privacy, it is said that Sender sends compressed message and encrypts the message with the private key of himself. And then Receiver will decrypt that message with the public key of the ...
3
votes
2answers
296 views

Safely remove an expired PGP key file

since it's possible to recover a deleted file I wonder how one can safely remove a PGP key file (with linux's command line tools) so that it's impossible to recover it. Maybe some dd command? Searched ...
15
votes
4answers
3k views

How can I encrypt a file using gpg without including the recipient's key ID?

An OpenPGP encrypted file will include the key ID of the intended recipient's public encryption key, as explained in this question. Is there any way to remove that information from the resulting ...
14
votes
2answers
2k views

What information is leaked from an OpenPGP encrypted file?

If an attacker obtains a file that has been encrypted using an OpenPGP public key, what information can the attacker deduce? For example, to what degree of certainty can the attacker deduce the ...
1
vote
1answer
96 views

GPG encryption date or GPG version recoverable?

Is there a way to determine the date of encryption or the GPG version of a GPG-encrypted file (with symmetric encryption)? I lost the password but some rough information about when the file was ...
4
votes
4answers
320 views

Securely publishing GPG keys

This is probably a stupid question/vaguely defined, but I need to ask it anyway. I want to put a public key for mail exchange on my website, such that even very powerful adversary with power to ...
11
votes
1answer
961 views

PGP: How is it possible for me to read a sent mail, encrypted by me with the recipient's public key?

I'm quite new to OpenPGP and am just starting to use it with Thunderbird. When I encrypt a mail with a recipient's public key, using Thunderbird + Enigmail + OpenPGP, and send it, I can find the ...
6
votes
1answer
103 views

What is the best way to manage package signing keys?

I am researching a way to protect, and enable accountability of, our packages when being transferred from our dev team, through to Q+A and eventually to deployment. I have initially created a signing ...
1
vote
2answers
174 views

Certificate security in intranet environment?

We have this topology in our company: A new rule says that each document being sent by Outlook should be encrypted. We decided using PGP. We already have a certificate (self-signed). The problem ...
4
votes
1answer
408 views

Is OpenPGP encryption a valid replacement for SSL when passing messages?

I am writing an application that occasionally needs to transmit larger messages to other servers on the internet without allowing people to snoop on the traffic. The normal way to handle this is to ...
6
votes
2answers
252 views

Is DKIM needed for emails encrypted with OpenPGP?

DKIM seems to prove that a message came from where it claims to be from. However, OpenPGP encrypts the entire email and signs it which obviously proves it also came from the person it says it did. ...
9
votes
1answer
378 views

Can all the (other) recepients of a PGP encrypted message be identified?

Does an encrypted message contain any information about whom it is encrypted to, or at least to how many recipients? And if so, is it at least only obtainable for other recipients or for just anybody? ...
18
votes
3answers
3k views

In PGP, why not just encrypt message with recipient's public key? Why the meta-encryption?

It's described very well by this diagram. It seems like the process used is convoluted and more round-about than it needs to be. Why is an intermediate random key generated for the payload's ...
4
votes
2answers
214 views

How to refuse delivering emails that are not signed by trusted PGP keys?

I'm fed up by spam and would like to have an email address that will only deliver mails signed by users I declared trusted. Some kind of purgatory for mails the signatures of which are trustworthy by ...
6
votes
1answer
235 views

Could a consumer-friendly PGP-like file encryption application theoretically be secure?

In a situation where there are desktop and mobile clients, and a central public key repository to and from which the desktop and mobile clients automatically upload and download public keys as needed, ...