Key management involves the entire key life-cycle: generation, exchange, storage, safeguarding, use, vetting, revocation, replacement and retirement.

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4
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1answer
166 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Do GPG/PGP keyservers "garbage collect" old keys which have expired, been revoked, or simply haven't been updated in a decade?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 ...
0
votes
1answer
32 views

Key Extraction via electrical signal processing

Looking for a link to what I believe was recent research that was similar to "RSA Key Extraction via Low-Bandwidth Acoustic Cryptanalysis" - but instead of being based on acoustic emanations, the ...
0
votes
2answers
73 views

Public Key Transfer between two Applications

I have a Service written in c# which uses asymmetric Encryption to Encrypt Data, and a client application which Decrypts the Encrypted data received from the service. How can I do the following ...
2
votes
3answers
222 views

Best practices for HSM's used by test and production systems

Should a test/demo/non-prod system be prohibited from using the same HSM as production? Since the same master key would be used for both test and prod it seems like it could raise eyebrows but I can't ...
2
votes
2answers
188 views

Expiration / enforce change of passphrase for private ssh keys

Out of curiosity, and also to check whether this is doable at all: Is there any way using standard tools to assign an expiry date [only] to the passphrase of an ssh private key, or to enforce the ...
0
votes
2answers
95 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 ...
3
votes
2answers
44 views

Preventing/Detecting forgery of logs generated in a potentially hostile environment

I have an application that runs on some host machine and generates logs. Later in the day those logs are securely transmitted to my machine. The problem is that while the logs are being generated I ...
2
votes
2answers
67 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 ...
1
vote
1answer
538 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 ...
4
votes
3answers
352 views

How can I secure the secret key?

I am a bit confused about securing the secret encyption key. Here is the scenario: I need to encrypt some data (file) This data will be read by a program (say written in C/C++). Both the program ...
3
votes
3answers
161 views

How can I securely and conveniently move keys, certs and other short data across an air gap?

What options are available for transferring data between unix machines separated by an air gap? USB flash drives Optical media eg CDs and DVDs Printed paper and Scanning+OCR QR Code software, ...
0
votes
0answers
91 views

How does Spideroak manage encryption keys

I'm trying to understand the following from SpiderOak's engineering page (sorry I'm on a mobile phone so have no access to formatting functions like quote blocks): "SpiderOak uses a nested series of ...
2
votes
1answer
56 views

Security implication of exporting private key

I have a key pair stored in GPG Keyring. If I export it to an ASCII Armored format, am I removing any layers of security as long as the exported key stays on the same server as the key ring itself? My ...
1
vote
1answer
50 views

Is there any benefit to providing multiple types of public keys?

Say I have a page on my website which lists public keys to be used in case people would either allow me access to a server, or send me encrypted information. Is there any benefit to me providing ...
0
votes
1answer
166 views

Can any App Store app access all of my passwords?

Whilst researching another question, I've noticed that on OS X 10.9.4 there are many instances of Library/Keychains/login.keychain from ~ within the Data folder of what looks like apps from Apple App ...
0
votes
2answers
145 views

How to combine a key and a password in practice

Alice wants to encrypt her data. She is not comfortable with using only a password. While she prefers to use a properly random crypto key, she isn't confident she can protect the key file from theft ...
3
votes
2answers
765 views

Export non-extractable private key from Keychain on OS X

I have a PKI certificate in Keychain Access.app on OS X 10.9, together with the private key. The manual page for /usr/bin/security indicates that there is a -x option for security import to specify ...
0
votes
1answer
129 views

How can I generate some public and private keys on both sides with low overhead?

We have an Authority Center (CA) generating some public and private keys for each client (more than one pair for each client). One method for sending keys to client is sharing a secret key between CA ...
1
vote
1answer
261 views

Can any malware access the OSX keychain data

I'm working on a security project. I have sensitive data that I would like to store in OS X's keychain. I'm able to add the data programmatically into the OS X keychain by using RHKeychain. But after ...
2
votes
0answers
118 views

secure key management using smart card

I have a scenario where I want to encrypt the file data on client machine along with smart card authentication. I have followed a link that states that for smart cards, private key never leaves The ...
0
votes
1answer
71 views

MITM protection, key distribution

I want to make sure each of my apps users only get their own data, and that nobody tampers with it or sniffs it in a MITM fashion. Encryption of everything should be the solution, right? But how do I ...
3
votes
4answers
424 views

Bastion host that allows jailed users to SSH but protects private key

Basically, I'm trying to let the user use a private key without having read access to it. Use case: Employee needs to SSH to a server in the data center. There is 1 private key for all servers, ...
1
vote
2answers
668 views

Storing SSH private keys on an Android device

(I'm not sure if this better belongs on unix.se or android.se, but since it's primarily security-related, I'm asking it here) I use my Android device to access servers for quick on-the-go ...
1
vote
1answer
256 views

How are private keys (sMIME, PGP, etc) synchronized across a user's devices?

Given that user needs to store a copy of the same private key on each of his devices (in order to decrypt email and other data encrypted with the public key) ... what are some general techniques for ...
6
votes
1answer
232 views

Recommended operational security for generating one's primary key pair?

I have been looking for an operational security guide for generating one's asymmetric key pair for (Open)PGP. I have found plenty of technical guides for how to use GnuPG to generate RSA key-pairs, ...
1
vote
2answers
379 views

Where to store a key for system wide encryption/decryption?

I have a web application where (among other things) customers can upload files and administrators can then download those files. The uploaded files are stored on ServerA and the web application used ...
3
votes
1answer
156 views

Utility of multiple signing subkeys when we're restricted to a single encryption subkey in GnuPG (PGP)

As I understand it, GnuPG allows the creation of multiple subkeys, but multiple encryption subkeys are problematic because it's not clear which encryption subkey someone should use when sending a ...
7
votes
6answers
5k views

How are ProtonMail keys distributed?

There is a service called ProtonMail. It encrypts email on the client side, stores encrypted message on their servers, and then the recipient decrypts it, also on the client side and the system ...
4
votes
4answers
93 views

Proof that client app is using the recipient's public encryption key

I'm trying to implement a web app(lication), which allows to share data automatically with connected users. Data will be encrypted end-to-end asymmetrically on the clients. My first plan was to share ...
0
votes
2answers
301 views

Security Modules - Hardware vs. Software

In terms of PCI requirements and compliance, is a software-based key management module like Gazzang zTrustee an acceptable solution to the PCI requirements that a (hardware) HSM solution like AWS ...
1
vote
0answers
200 views

SSH using pre-existing session (symmetric) keys

Is there at present a way to open a SSH connection using pre-existing symmetric session keys? In other words, if I create a list of symmetric keys can I send that list to the recipient on a CD or USB ...
3
votes
2answers
441 views

Storing the master key in the app server binary

Imagine you have a master key to encrypt/decrypt the data saved in your database of your app service. What is the risk of having this key embedded in your app service code to store this key in the app ...
6
votes
3answers
358 views

Is it a bad idea to share the ssh host key in a diskless environment?

I am looking at this cluster of student work stations. They are diskless clients which boot from NFS. They also have sshd enabled. All of these machines share the same ssh host key (rsa,dsa,etc), ...
1
vote
1answer
87 views

How to validate the confirmation link received when publishing a new PGP key?

I find PGP to be quite a complex subject. I have gotten to a point where I need to give a client a public key for encryption. I have successfully done my homework, generating a public key from my ...
4
votes
1answer
352 views

GPG master key without email address

I would like to create a new GPG key. Going through a couple of thread it seems like the most popular scheme for maximum security is to have an offsite master (sign-only) key which provides a shell ...
0
votes
1answer
202 views

Multi user symmetric key encryption

I realize SIMILAR questions have been asked before but I'm looking for certain specifics I can't seem to find elsewhere. The following question closely resembles mine but falls short for me on ...
1
vote
0answers
50 views

Key Distribution using multicast

I am trying to come up with a solution for a system where i need to generate a key (Kn) from time to time and distribute it to a large number of servers in a private network. Since it has to be a ...
1
vote
1answer
113 views

When does S/MIME require the other party's certificate and when is their key enough?

Trying to understand S/MIME implementation, I see that sometimes you must have the other party's certificate, and sometimes its enough to just have their public key. I'm confused as to when you need ...
1
vote
0answers
176 views

Storing private messages in a database

I am creating a portal where users can send private messages (PMs) for a very large audience. So I want to encrypt the messages and store them in the database. But I do not want to ask the users for ...
2
votes
1answer
977 views

Storing encryption keys on a server using Node.js and MySQL

I am writing a web backend/api for an iOS application using Node.js and MySQL. In my database I have a table for posts. I would like the posts content to be encrypted. Let's say I'm using this AES for ...
0
votes
1answer
239 views

how to verify file signature by client PGP

Currently working on verifying and signing a file via GNUPG, given that I've already signed a file, given the clients the .sig and public key, is there a way for a client to verify the file without ...
4
votes
1answer
126 views

Recommended symmetric key usage period

Let's assume that there are two nodes A and B connected over a network. Both have a single pre-shared symmetric key (e.g., AES-128) and exchange messages. What is the recommended period, until the ...
7
votes
3answers
486 views

Server side SSH keys compromised

I'm interested in knowing what could be the consequence if the server side SSH keys of a host were compromised. The situation would be: An attacker manages to read the SSH private keys of the ...
0
votes
1answer
117 views

Multiple user encryption-key store

Let's say I have an application that accesses an encrypted datastore, and I want the admins to be able to unlock the datastore upon application startup (and then the application will have access to ...
1
vote
0answers
272 views

What is the preferred way of using AWS (specifically S3) from mobile apps?

Adding the AWS access key and secret key directly in app code is definitely not a good approach, primarily because the app resides on the users device (unlike server side code), and can be reverse ...
-1
votes
1answer
118 views

Implementing a product key system?

Say I have a piece software that allows people to download a trial version that can then be unlocked. Would the following steps below be an effective way to implement a key system for unlocking the ...
2
votes
2answers
57 views

How secure is switching keys if breaking the key is an intractable problem?

Let's say that you create a system where a secret is hidden and revealed by a particular key. As well, the key can be broken, but it would take thousands of years. If you keep switching the keys ...
2
votes
2answers
363 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 ...
1
vote
0answers
516 views

How to securely delete an OpenVPN connection profile

I store my OpenVPN profile (keys) in an encrypted drive but I run OpenVPN inside an OS that is not encrypted. When I finish my OpenVPN session and disconnect, the connection profiles are still there ...
1
vote
2answers
647 views

GSM A5/1 encryption: Key management

I'm currently studying the A5/1 algorithm used for GSM encryption. I understood how thanks to the symmetric private Key and a public counter frame one can encrypt the communication between A and B. ...