Public-key cryptography (encryption is a misnomer) is the process of creating two keys during the encryption of plain text, one private and one public.

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GPG2 Encryption - No public key error

When I generate my keys using gpg2 --gen-key and then I try to try to encrypt the file using gpg2 --batch --yes -r myemail@test.com --always-trust --homedir . -e test.text I get an error ...
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How does public/private key cryptography work, who generates the key pair?

I have a requirement to encrypt a file, get it to an external partner who will then decrypt the file using a key. My "basic" understanding is that I can generate the public and private keys, encode ...
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gpg does not ask for passphrase on one encrypted file

I have a test encrypted file on my computer that when I run gpg(2) --verify message.txt.asc I get: gpg: Signature made Tue Mar 3 21:16:41 2015 PST using RSA key ID ******* gpg: Good signature ...
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Duplicati uses symmetric encryption despite giving the recipient ID_key

I have a question regarding decrypt using gpg asymmetrically. I use duplicity encrypt copies asymmetrically. E.g: `Duplicati.CommandLine.exe backup s3://testduplicatigpg3 C:\Users\test\Desktop\tt ...
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How to recover files from infected. Vvv extention [duplicate]

Can any one help for how can remove this virus. Our all computer's files infected from this (.vvv) virus. We are using windows 7 Plz give me strong methods. If you need remote screen i will provide ...
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Why does PGP encrypt differently when piping into a file instead of printing the result?

I'll use the following PGP key stored in pub.pem: -----BEGIN PGP PUBLIC KEY BLOCK----- Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com> ...
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How to verify downloads by GPG4Win

In particular, I am installing Gentoo Linux following this manual up to this point: Verifying the downloaded files Through the .DIGESTS and .DIGESTS.asc files, the validity of the ISO file ...
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137 views

Why does duplicity require the GnuPG passphrase when rotating backups?

I am using duplicity 0.7.05 to periodically backup a directory that resides on a Linux system, using a GnuPG key pair with an encrypted private key. Since the public key is not encrypted, the ...
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645 views

Outlook missing “Publish to GAL”

Unable to encrypt emails with valid certificates in exchange environment. I just thought of publishing the public keys to GAL but Publish to GAL option is missing Things i've tried : Re-download ...
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35 views

openssl smime message signing: why do I need a -certfile key?

Here is how one should sign a message with openssl smime? according to the docs openssl smime -sign -in in.txt -text -out mail.msg -signer mycert.pem \ -inkey mykey.pem -certfile mycerts.pem But ...
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How are public keys “sent” to servers, and how are private keys “used” for SSH?

There are two Linux machines, A and B. Scripts running on A need to be able to SSH into B. So A generates a public key (probably an ssh-keygen-generated id_rsa.pub), and then uses its respective ...
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Should my OpenPGP key used for storing documents in the cloud expire?

I plan on doing a mass migration of all my local files to various cloud services since space is pretty cheap these days. I figure I should probably encrypt my data before I upload it, which is better ...
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78 views

GPG 2 decrypt from STDIN via pasting inconsistency

Does anyone know why in some cases you can do this: gpg2 -d And paste your GPG message into the terminal, type ctrl+D, get prompted for your passphrase and get the results to STDOUT? But in other ...
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160 views

How to sniff passwords remembered by applications?

Suppose someone forgets their password for a web application such as gmail, facebook or some other application installed on the system such as skype, but the web browser or skype still remembers the ...
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34 views

After Updating to SHA2, private and public doesn't match

I've upgraded to SHA2 certificate, but after upgrading the new certificate key doesn't match my old private key. Public key has changed after updating and it doesn't match to previous private key. ...
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How to get GPG working with Outlook 2013?

My OS is Windows 8.1 Update 1 x64. I have Outlook 2013 and just installed GPG4Win (latest, 2.2.2, full version). When I now launch Outlook 2013, I still don't see any UI/options to setup certificates ...
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382 views

Import public key (plain text) into Outlook 2010

I have a public key: -----BEGIN PGP PUBLIC KEY BLOCK----- ... -----END PGP PUBLIC KEY BLOCK----- Is there any possibility to use this public key in Outlook 2010, without any add-ins? I know about ...
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Can you extend the expiration date of an already expired GPG key?

Lets say I add an expiration date to a GPG/PGP key, then for some reason am unable to extend the expiration date of the key before its time is up. Assuming I still have access to the private key (and ...
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280 views

Can a client server host multiple private ssh key for same profile?

I have a client who is using Tectia Client to connect to our UAT. They created a ssh pair and imported the private key to the profile they are using to connect,and passed us the public key. Now we ...
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251 views

Is uploading your openssh public key to ~/.ssh/ for a given user safe?

I like to upload my public key (eg: ~/.ssh/id_rsa.pub) to various servers that I connect to on various networks for work. I use this same public key on Github. If I am on a shared user account and I ...
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Is there a tool like dm-crypt/luks using RSA encryption?

Is there a library/tool available for linux, similar to dm-crypt/LUKS using RSA encryption instead of symmetric ciphers? I want the "public side" to only be able to create these volumes, and the ...
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Is there a way to revoke a GPG encryption key?

OK, so as I understand it, the key revocation mechanism is used to revoke a signing key in your web of trust: so you say to other GPG users that your previously-used identity has been compromised, and ...
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1k views

How to ASCII-armor my public key without installing GPG?

I would like to upload my public key to a key server, but I already have my key infrastructure in place without GPG and I don't want to install extra software I don't need. Is there an easy way to ...
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448 views

Errors generating gpg keypair

I posted this originally on stackoverflow, but was told that it was offtopic and this would be the better place to post it, so I am reposting it here and deleting my original topic. I have a rather ...
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why does public key used to authenticate ssh seem to expire after a while?

I want to ssh from client to server without a password, so I append client's public key to server's authorized_keys. While previously I needed a password, immediately after I do the above, I don't ...
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What is the role of cakey.pem and cacert.pem in addition to .key and .crt based encryption

I have .key file which holds the private key data, .crt file which would be certificate with public key and, to my knowledge, that's it for public key encryption, right? Not exactly. In order to ...
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OpenSSH client refuses to use a new key file

After generating a new ssh private key (id_rsa) on one server and distributing it across a server network, one server is failing to use the new key, and falls back to password authentication instead. ...
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Configuring Public Key Authentication with SSHD under Cygwin

I am trying to configure SSHD to allow public key authentication under Cygwin on Windows Server 2012. Currently my problem is access being denied. I have confirmed that my public key is saved as a ...
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How do you create an AES XTS key?

I am interested in hacking around with Gluster cloud FS whose most recent beta uses AES with XTS only. It also requires openssl >= 1.0.1. The 1.0.1f Jan 2014 openssl (with 64 bit lib) install for my ...
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51 views

Why would one want to tag the computer where a key pair was made in a public key?

While trying to give an host a bit more of security, i decided to switch to SSH key's authentication. To do so i followed this guide, but something makes no sense in my mind. While the host is the ...
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Human-readable dump of gpg public key

Is there some tool to write out the actual content of a GnuPG public key in a way a human can unserstand? I mean not only ascii-armor which a human can read and type, but something which really breaks ...
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How to decrypt a message sent via Pidgin-Encryption?

A friend sent me an offline Google Talk message that was encrypted via Pidgin-Encryption. It didn't appear in my Pidgin logs because I wasn't logged in when it was sent, but I do have the encrypted ...
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112 views

Finding sshd log file

I'm experiencing some problems with SSHD on my server. I'm trying to set up passwordless (pub/pv keys) authentication. It worked for my other servers, but not for this one. The SSHD agent adds my ...
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200 views

SSH keys cached remotely?

I wanted to install a new public key on a remote server. I created a keypair using ssh-keygen -t rsa on my Macbook, then added its public key to authorized_keys on the remote server. It is the only ...
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634 views

SSH Using Wrong ID

I am trying to establish password-less ssh to myself on a CentOS6 system. I go through the following steps: ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa cat ~/.ssh/id_dsa.pub >> ...
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Why does GPG/PGP by default use different keys for signing/encryption?

If you create a new GPG key, you'll by default get a signing-only master key pair and an encryption-only sub-key pair. pub 2048R/XXXXXXXX created: 2013-02-09 expires: 2014-02-09 usage: SC sec ...
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297 views

How to show (for copy&paste) a secret GPG/PGP key without creating a file

I need to access my secret GPG/PGP key to copy/paste it into another application. How do I show my secret key without generating too much traces of it? I only know of the export command to gpg (or ...
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766 views

Signature Verification using OpenSSL

I have been experimenting with OpenSSL and OpenSSH and I have been unable to sign and verify using RSA key pairs. I did the following Generated key pairs: $ ssh-genkey -b 2048 -t rsa ...
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How can I use GnuPG with ECDSA keys?

I'd like to generate an ECDSA (rather than RSA, DSA, or ElGamal) key using GnuPG, and use it as I might otherwise use an OpenPGP-compatible master key. I've read that gpg2has support for ECDSA keys, ...
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Why am I prompted for a password when using SSH to connect to another server?

I installed a fresh copy of CentOS 6.4 on two boxes, and Im trying to setup password-less SSH from server1 to server2. On server 1, I generated a key with ssh-keygen, transferred it to server2, put ...
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Setting up sshd_config in cygwin for AES encrypted file transfer

I'm a bit newer to cygwin and sshd, and I want to configure sshd to allow encrypted SFTP file transferring. From what I understand, I need to find some sort of sshd_config example (which for some ...
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Can I change the filename of my ssh public/private key pair?

I created a public/private key pair: ssh-keygen -t rsa -C "me@example.com" I gave a different key file name than id_rsa since I wanted to create a new separate key from my normal identity. I gave ...
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GPG4WIN Keys and Transferring them

I have installed www.gpg4win.org and have generated a keys that will allow me to both sign and encrypt files. On windows it uses the (KDE) / Kleopatra Certificate Manager - Version 2.1.0. What is the ...
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Isn't it dangerous to use SSH keys to login to an unknown/compromised server?

Say I provide someone with my public SSH key, the id_rsa.pub and he/she installs it on a server that is compromised, and I am asked to login. Does the login process involve sending my private key to ...
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How can I allow a user to connect to my OpenVPN by knowing their public key?

Given the public key of a remote user, I would like to run OpenVPN and allow that user to connect to my network. I only need to be connected to one remote machine at a time. The options outlined in ...
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199 views

SSH rsa key works with external IP not internal IP

I am using rackspace cloud hosting. I have 2 servers behind a load balancer. Each server has an external IP and an internal IP. I want to setup a sync job that uses SSH to transfer files. I made ...
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Does the right half of the rsa public key matter?

In a public key file "id_rsa.pub" generated by ssh-keygen, does the part after the == matter? I ask because when I changed "root@somedomain.com" to "root", it seems to still work. More generally, I ...
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gpg: import failure key xxxxxxxx: no valid user IDs

i am getting this error while importing a public key on gpg (GnuPG) 1.4.2 gpg: armor header: Version: GnuPG v2.0.14 (GNU/Linux) gpg: pub xxxxx/xxxxxxxx 2012-05-25 abcd xyz <email@address.com> ...
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how to verify the trust path to a gpg key?

I want to check whether the gpg key used by Julien Danjou for his emacs snapshot repository can be trusted. There are many trust paths from my key to Juliens key. But I can't believe that there ...
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How to embed an ASCII logo into an ASCII-armored RSA key?

The cryptoparty site publishes an RSA key with an ASCII art logo embedded in it. Is there a way to put arbitrary characters in an ASCII-armored RSA key? From https://github.com/cryptoparty/handbook ...