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

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6
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2answers
993 views

What happens if two parties have a same pair of public&private keys

we know that we have to create Private key on server and generate its public key and create a certificate. But what if we get a private key which someone already has. Isn't the security becomes weak ...
6
votes
1answer
678 views

Is this security/encryption scheme secure?

I'm rolling my own, personal threetags.com-style 'encrypted data in the cloud' webapp (I didn't like the UI, and lack of non-browser client). However, I have absolutely no experience with security ...
6
votes
4answers
433 views

How do you guarantee that you don't lose a keyfile?

I am toying with the idea of adding keyfiles to various things that I encrypt. However what's been keeping me from adopting them is guaranteeing that I don't lose the keyfile while still keeping ...
6
votes
3answers
6k views

How can I convert my encypted PGP secret key for use performing SSH authentication?

I wish to covert my PGP key (RSA) to be used performing SSH authentication. After some searching, I found openpgp2ssh, which appears to be an appropriate tool. Everything works swimmingly for my ...
6
votes
5answers
735 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, ...
6
votes
3answers
696 views

Vulnerabilities with DB backed session tokens

A user logs in and is given a session token. This token is also stored in a database on the server. The user includes this secret token with each request, and the server will pull it from the DB to ...
6
votes
4answers
6k views

Why do APIs use API Keys instead of Usernames?

It is now common to use an API Key to identify an agent when dealing with an API. What are the merits of doing that over using a username specified by the developer? Is it simply that the API Key is ...
6
votes
1answer
10k views

Exchange of DEK and KEK (encryption keys) between app server and key server

In my application, it is required to encrypt a user's data before inserting it into the mysql database. I am using AES algorithm to encrypt the data using a 256 bit hash (and is calling it Data ...
6
votes
2answers
337 views

How protective should we be of an SSL client certificate?

We've got an application where the database connection requires an SSL client certificate. How protective do we need to be of this certificate? What are the implications if someone else gets it? I ...
6
votes
1answer
2k views

Public key length

I was wondering if there was (and I hope there is) a standard for public key size for ECDH (Elliptic Curve Diffie-Hellman) and ECDSA (Elliptic Curve Digital Signature Algorithm) for every curve type ...
6
votes
1answer
916 views

What is the “PGP Global Directory Verification Key”?

In the server keys of the MIT, there is several signatures from "PGP Global Directory Verification Key". Example (from http://pgp.mit.edu/pks/lookup?op=vindex&search=0xB63024F96C73DA99): sig ...
6
votes
1answer
434 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 ...
6
votes
2answers
1k views

Generating one-time tokens from API-key?

I have a web-site for which I'm building a Drupal module that allows the users of that Drupal site to navigate to my web-site directly from the Drupal site. I intend to distribute secret API-keys to ...
6
votes
1answer
1k views

DPAPI equivalent on linux?

I have an app server and a db server. I want to send certain data to the db encrypted, using a DEK (data encryption key). Ideally, this DEK is read protected on the linux file system and encrypted ...
6
votes
2answers
768 views

How can you securely generate keys on AWS?

Our application needs to generate secure keys for long term storage on AWS using openssl. But I've seen some instance where entropy falls dangerously low on AWS machines and this doesn't appear to be ...
6
votes
1answer
194 views

Creating a Private Key using Human Intervention

In a hypothetical system, lets say that a design requirement is that people who snoop around the database of a web application (sysadmin gone rogue, or what have you), do not have access to the plain ...
6
votes
1answer
203 views

public key distribution from a central server

I'm trying to code up a encrypted communication program. Originally I was thinking that I would use public key cryptography and then I would keep the public keys in a database where users could query ...
6
votes
3answers
152 views

Should I make sure to get all of my OpenPGP uids are signed?

Should I make sure that I get all of the uids associated to my OpenPGP key signed, or is it enough to have one of them signed? If Bob can guarantee that alice@example.com belongs to Alice, I can't ...
5
votes
2answers
4k views

How to store IV and key temporarily but securely

I am using .NET 4.0 to develop a Windows service that will temporarily store encrypted data in a database. The data will be encrypted when it is inserted, then decrypted, processed, and deleted once ...
5
votes
3answers
224 views

Is there a common name for a software defect that leads to unexpected transfer of secret over the wire?

Suppose in a C++ program I use a memory region for temporarily storing an encryption key and don't overwrite that region afterwards. Then my program wants to send a data packet over the network. Due ...
5
votes
2answers
467 views

Continued Use of Kerberos

I posted this question over on Crypto.SE, but didn't get any takers and thought it might be more suited for this site as it were, so I'm cross posting it here. I was recently looking through the Mac ...
5
votes
3answers
8k 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 found the hexa value of the key in the binary file, but I guess the position is based on ...
5
votes
2answers
166 views

Why don't PGP keyservers enforce double-opt-in?

One thing that I found out when starting using PGP: When I uploaded my keys to the SKS keyserver, the keyserver did not take any action to verify that I am who I claim to be. Since a PGP key contains ...
5
votes
3answers
9k views

How to store a private RSA key for an application?

I was wondering how an application that have a private key will keep it secure? If the private key is outside the binary, then anybody can access it, but store it in the binary doesn't make it more ...
5
votes
2answers
161 views

Best practices: Use of a single private key as a person, or multiple to identify self across domains?

Similar to the question here, I'd like to apply the same question to a person. For example, I have implanted a chip in my hand that holds an encrypted private key that serves as my personal unique ...
5
votes
1answer
187 views

Help - Somebody stole my OpenPGP key ID, what can I do?

I received a key transition statement because somebody found himself in the exact same situation described here. This issue will target more and more OpenPGP users in future, probably even all of ...
5
votes
2answers
589 views

A SW system constructed with Microsoft CNG can be FIPS 140-2 Level 2 Compliant?

We have to design and construct a system that signs files with sensible data, like evidences/proofs. The sign process is simple, basically calculate MD5 of the file content and encrypt the MD5 result ...
5
votes
2answers
1k 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 ...
5
votes
2answers
756 views

TPM- Symmetric key storage

I understand that the TPM can be used to store an unlimited number of keys. However I am left with a few questions: Presuming the TPM is connected on the LPC what protects the data travelling across ...
5
votes
3answers
447 views

Authenticating client without hardcoding key?

A basic question, but I'm not a master and this is puzzling me- How is it possible to authenticate a client from the server's perspective? i.e. imagine you're the server, and you want to give the ...
5
votes
2answers
4k views

MySQL AES_ENCRYPT key length

AES_ENCRYPT uses a 128 bit long key to encrypt the data, but how MySQL handle longer or shorter keys? I found out that PyCrypto for instances recomend to transform the key by using MD5, SHA-1, SHA-2, ...
5
votes
1answer
565 views

Is storing a private key in a device as it was done in AirPort Express the right solution?

Here's a story about how one guy reverse engineered AirPort Express and obtained the private key that was used to prevent cloning the device ability to stream audio to approved devices only. So ...
5
votes
4answers
524 views

How to inject a key (physically) on a huge number of devices?

The system I am designing has a huge number (assume millions) of individual devices, and each device needs to be injected with a unique symmetric key dedicated to that device. Each device also has a ...
5
votes
2answers
979 views

Is HTML5 sessionStorage secure for temporarily storing a cryptographic key?

Assume I am building a local web application (e.g. browser extension) in HTML5 to encrypt a database locally. Access to the database is controlled by a password and a cryptographic master key is ...
5
votes
1answer
64 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 ...
5
votes
1answer
146 views

How do I sign another person's key and make the signature expire?

I'm using gnupg and I've just seen that people can sign keys with an expiration attached. The expiration of individual signatures can be seen in gpg --list-sigs <KEY> when setting this in your ...
5
votes
1answer
238 views

Design of system based on HTTPS, Client Certificates and custom CA

I have the following system: 2 application servers. At the beginning is installed the first server and later is installed the second one. A client access from a browser to both servers Application ...
5
votes
2answers
82 views

Public key for SSH over the internet differs from a key for SSH over the LAN

I have a Raspberry Pi and can access it via SSH (authentication via user password) when my laptop is in the same network. Now I want to access it over the internet. I already set my router to forward ...
5
votes
1answer
24 views

Transparent key management for client computers

I'm tasked with adding a backup feature to our software. This backup feature should store the customer's database on external memory. One of the requirements for this feature is that the backup should ...
5
votes
3answers
209 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, ...
5
votes
3answers
5k views

Where do I securely store application-specific symmetric key?

I am writing an application App1. This application uses SQLite database and I plan to encrypt it using AES256. For symmetric encryption I need a key, which I need to store somewhere. From a similar ...
5
votes
1answer
1k views

How does firefox sync password recovery work?

According to Mozilla Sync-new-security-model, Firefox servers are not able to decrypt your sync data without your password. So I figured that, the browser generates a key from your password, encrypts ...
5
votes
1answer
2k views

Truecrypt - One keyfile multiple passwords

Is it possible to create one keyfile that opens a Truecrypt volume and this keyfile is protected (aes encryption fe) with a password? The use case is a True crypt volume accessed by multiple ...
5
votes
2answers
290 views

How are symmetric cryptographic keys stored?

If you have a symmetric key which is negotiated via SRP protocol between a mobile device (e.g. smartphone) and a server, what would be a safe way to persist this resulting key on each side? On the ...
5
votes
1answer
579 views

Asymmetric / end to end encryption for web messaging app

Background I'm trying to design a secure and sustainable web app for messaging. The purpose is to learn how to create secure web application. The application is suppose to be written in Javascript ...
5
votes
2answers
220 views

Malware known for stealing private ssh keys

The ssh private key file, stored under ~/.ssh/id_rsa in many *nix distros, is typically owned by the user, allowing any program invoked by that user to read the file, and perhaps upload it to a remote ...
5
votes
3answers
507 views

Current industry standard key management solution for web app on linux host

The scenario: Data is sent to an application server and you want to selectively encrypt some data before sending it to a DB server for storage. All servers run some linux distro. This is a relatively ...
5
votes
1answer
1k views

Distributing API Keys to Mobile Apps

I'm currently developing a mobile app (iOS based initially) that consumes multiple APIs. Currently we're storing API keys as strings in the the prefix header file, and initializing most of the APIs ...
4
votes
3answers
543 views

Safe storage service for private keys

Is it currently technically (as opposed to financially) possible to provide a fairly secure means of providing a storage facility for private keys, not excluding physical verification etc? As in, you ...
4
votes
2answers
334 views

GnuPG asks for a key ID when sharing my public key, what is that?

I generated a public key using GnuPG. I can see it using --list-keys $ gpg --list-keys /Users/mertnuhoglu/.gnupg/pubring.gpg ------------------------------------- pub 4096R/CB3AF6E6 2015-12-24 ...