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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228 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 ...
3
votes
2answers
557 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 ...
1
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2answers
736 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 ...
4
votes
1answer
228 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
167 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 ...
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2answers
2k 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 ...
6
votes
2answers
395 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. ...
5
votes
2answers
353 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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1answer
88 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
850 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 ...
8
votes
1answer
704 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 ...
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2answers
349 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
209 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 ...
7
votes
4answers
2k 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 ...
10
votes
2answers
1k 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
90 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
278 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 ...
8
votes
1answer
492 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
96 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 ...
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vote
2answers
145 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 ...
4
votes
1answer
316 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
185 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
289 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? ...
14
votes
3answers
2k 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
192 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 ...
5
votes
1answer
211 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, ...
3
votes
3answers
2k views

Secure way to transfer public/secret key to second computer

I created a public/secret key using Seahorse (GNOME managing tool for encryption keys). I haven't had issues encrypting and decrypting files from the computer the keys are located in but I'd like to ...
3
votes
2answers
975 views

Can GPG be a full replacement for PGP?

I am working on automating a PGP process and plan to replace using PGP with GPG. But I need to make sure GPG can actually be a replacement. Does GPG do everything PGP can do? I've researched a lot ...
1
vote
3answers
492 views

Please recommend best-practices documents for sharing encrypted data with non-technical end-users

Is there one, or several, "best practices" documents which cover in clear simple language how to share data among a non-technical support staff and non-technical end-users at various organizations? ...
6
votes
2answers
653 views

Does using both GPG encrypted files and encrypted filesystem make sense?

For a few years i stored my personal text files encrypted using an asymmetric key through GnuPG. Now i thought that it is a good idea to also encrypt my hard drive partition. Does it make sense to use ...
1
vote
0answers
166 views

OpenPGP CFB mode examples [closed]

Does anyone know where to get worked out examples of OpenPGP's CFB mode encryption? I know RFC 4880 explains it very precisely, but I managed to mess it up somehow. I got one example from asking on ...
1
vote
1answer
188 views

PGP Secret Key Values calculation

I know this is somewhat counterintuitive, but: Does anyone know of any place where I might get intermediate values from PGP when it decrypts the secret values of the Secret Key packets and shows ...
2
votes
1answer
152 views

How are AV scanners protecting against encrypted (PGPd) malicious code?

As a user of PGP I worry about receiving a virus that was previous encrypted with my public key, which anybody can get by querying many PGP key servers. What prevents an attacker to target a PGP user ...
7
votes
4answers
728 views

Alternative to “web of trust”

Let's say I have an SMIME platform where I want to easily establish trust across the entire world for a particular purpose, for example for sharing valid financial information. I think that a ...
1
vote
1answer
72 views

Are there negative influences in the Web of Trust? If not, are there theoretical alternatives?

Suppose I encounter a trusted PGP key that isn't really who they say they are. I don't want to sign their key and promote that entity. Can I somehow show my dissidence from the trust that everyone ...
2
votes
1answer
1k views

Brute-force a passphrase, generated by `pwgen 16 -s`, of a GPG CAST5 archive

A sad story: One of our hard drives failed. While it was failing, we managed to take a quick backup. As it is our standard practice, we encrypted the backup using GPG (by however method Duplicity uses ...
0
votes
1answer
574 views

What is purpose of --s2k-* GnuPG options? [closed]

When I use gpg --symmetric --s2k- and press tab some options appear: --s2k-cipher-algo --s2k-count --s2k-digest-algo --s2k-mode What do those options do?
12
votes
5answers
936 views

Can a .sh file be malware?

Can a .sh file be a virus or something harmful? Is it like .exe files on Windows? If yes can someone read this script and tell me if it safe and is it effect any how on gpg security. It gives me an ...
3
votes
2answers
696 views

Do OpenPGP/GnuPG apply slow hash to password when encrypting/decrypting key?

Password space is quiet small. Therefore slow hash should be applied to password before using it for encryption. Should slow hash function (like bcrypt) be applied to password before using it with ...
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votes
1answer
460 views

Safest and most secure way for backing up private data

Here is what happened, I first collected my data into one folder,tar'd it, encrypted it with gpg, put it in truecrypt container, and after that started to copy the container to another place, but ...
3
votes
2answers
446 views

Security of GPG encryption with AES and MD5 if MD5 is broken

I have a file encrypted with gpg, using AES256 and MD5. Suppose that the MD5 hash function is broken, but not the AES cipher. Does that make it easy to crack decrypt the file?
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vote
2answers
932 views

gpg encryption security

How secure is encryption files used gpg this way gpg -c personal.zip will not use any keys or other lines, and how good its compared to truecrypt Note that I will upload encrypted files to my ...
9
votes
2answers
1k views

Does GPG key expiration add to security?

I've created a new GPG key to sign a software package in a source repository, with an expiration date three years from now. It seemed like a good security measure, because if the key is compromised or ...
2
votes
1answer
2k views

Is your PGP passphrase used to decrypt an encrypted private key, or needed in conjunction with the private key to decrypt the message?

If the former, then if the private key can be used to digitally sign messages, why doesn't your client offer to encrypt this highly sensitive piece of data? If the latter, then if someone had access ...
8
votes
3answers
3k views

What are the risks of storing passwords in a GPG encrypted file?

I currently store my passwords in a text file encrypted using GPG -e (specifying my own public key). When I want to lookup a password I'll do something like gpg -d passwords.gpg | grep ...
3
votes
1answer
152 views

Complex Consumer Matching Queries with PGP Universal

For group membership I am using LDAP for performing the consumer matching. I can pretty clearly see how to do simple matches with ORs or ANDs, but I would like to match in a more complicated fashion. ...
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votes
2answers
382 views

Whether PGP is send over MIME?

If I am using PGP to encrypt mails whther it is send as a MIME (Multipurpose Internet Mail Extensions) message, and S/MIME and PGP are used for providing email security. When I send PGP message ...
3
votes
2answers
870 views

What encryption schemes require two or 3 private keys to read a message?

I would like to encrypt some data so that it can only be read if two or three people use a private secret to decrypt the data. What is the best / most modern way to accomplish multi-person ...
2
votes
2answers
4k views

Automating PGP encryption? (Windows)

Let's say I have daily files that need to be encrypted using PGP (and then emailed) and I want to automate this task. I would be using Windows PowerShell to manipulate the files (examine date/times ...
9
votes
4answers
2k views

How do I encrypt the source and destination IP address, along with various parts of an email?

If the subject makes no sense to you, that's fine, it makes no sense to me. I've been tasked with securing emails sent from some devices, and I'm looking for advice on intelligent questions to ask to ...