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

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141 views

Best practices to copy private keys to mobile devices

I would like to copy an ssh key to my Android phone. However, I have displaced the connection cable for my computer. I am looking for a safe way to transfer the key to the device. Obviously, I don't ...
3
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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 ...
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2answers
1k views

Change 'Key Usage' of a certificate

Is it possible to change the 'Key Usage' property of an existing ssl certificate of a web site? Our goal is to host a web service so that a third party can integrate with our solution, and their ...
3
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2answers
489 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 ...
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3answers
131 views

Encrypting a fixed format message with commands and transmitting over the internet

Linked to: Encrypting a fixed format message? I need to communicate from Site A, a set of information that will be presented to users of Site A, which when they choose to submit, should travel to my ...
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2answers
112 views

Do I ultimately have to hold a key in my head?

To preface, I'm not an IT security person, just a layman intrigued by the logic. I had this question while reading about Ladar Levison turning a key to his email service on paper to the government. ...
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4answers
2k views

Using dynamic keys

It is intuitively clear that, the less materials a cryptanalyst has available to work on, the lower would be his chance of success. This implies that the security of encryption of a message could be ...
3
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4answers
487 views

Generating OpenPGP key pair with restrictions

I intend to generate an OpenPGP RSA key pair where a part (~half) of the private key is as I specify, i.e. a specific string. Are there tools for generating a key pair with such restrictions, or will ...
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2answers
418 views

How Securely Store Sensitive Data on Mobile Appliation

i want to develop a mobile bank app (windows phone, android, ios) that interact with bank channel. first time when user opens application the key exchange process begins and at end of this process a ...
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1answer
144 views

Is the PGP Web of Trust / Keyserver infrastructure permanently broken?

I love the idea of decentralized trust, the web of trust, and the fact that anyone can run their own keyserver and isn't beholden to a centralized point of failure. But does the decentralized ...
3
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1answer
404 views

Hybrid key management doing it wrong?

I'm currently working on a project that needs be as secure as possible key-management. My experience with encryption, decryption and key-management are none whatsoever so i did some research on the ...
3
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1answer
2k views

Storage of 'secrets', keystores, HSMs and the rest

I've been digging for the past few days into storage of sentitive data. If I store this data in a database, I believe the general accepted practice is to store sensitive data encrypted, for various ...
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2answers
188 views

Encrypting a fixed format message?

I'm planning to send across TWO pieces of information over the internet from machine A A site identifier which will be like: $SiteName = "EXAMPLE" (in plaintext) Encoded text which will be like: ...
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1answer
3k views

How do I use C# to encrypt/decrypt data where the private key is on a smartcard, hardware security module, TPM chip etc

Is anyone aware of a C# code sample to interact with smartcard, hardware security module, TPM chips (etc), that will allow me to encrypt and decrypt data? My goal is to allow my application to ...
3
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1answer
883 views

Is knowing the decrypted and encrypted data enough to find the key?

Let's say an attacker knows the encrypted content, the decrypted content and the algorithm used: can he get the key that was used to encrypt the content or does it make it easier to find the key out? ...
3
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1answer
167 views

Can we build a key exchange protocol without certificates?

Assume that the server and the client both has some secret key K. Is it possible to have a key exchange protocol with authentication between them such that MITM attack cannot hold and if the key is ...
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1answer
2k views

What is the best practice for storing a secret on the cloud?

This post on Securing Java Application Data for Cloud Computing offers a good introduction to using a Java KeyStore for securing encrypted data in the cloud. It neglects, however, to answer the ...
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1answer
435 views

Help on interpretation of FIPS-140 paragraph

This is from the FIPS 140-2 standard: Cryptographic keys stored within a cryptographic module shall be stored either in plaintext form or encrypted form. Plaintext secret and private ...
3
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1answer
107 views

How to deal with SSH keys in insecure environment

I am trying to find out a "safe" solution for the following situation. tl;dr how to keep things secure in an environment that is absolutely not? I work in a company where workstations are not safe ...
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1answer
154 views

Why use “App Secret” in mobile applications?

I see some SaaS require to import "App Secret" into your application also with "Application Key". I understand the "Applicaton Key", but can not understand the "App Secret". Here is why: I can ...
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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, ...
3
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1answer
363 views

Is it important to keep my pastebin developer key private?

I would like for my application to enable users to save their programs to Pastebin through the Pastebin api. This requires a developer key, which is automatically created with each account. Keeping ...
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1answer
2k views

How do I share my S/MIME public key?

I have setup S/MIME encryption for my email address, and I'd like to allow people to download the public key from my website, rather than having to first receive an email from me. I want the public ...
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2answers
307 views

Verifying the authenticity of a public key without manual intervention?

In RSA encryption it is said that ensuring the authenticity of the public key can be as important as the protection of the private key. An effective way of doing this is to have key custodians ...
3
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1answer
287 views

What dangers are there in storing my private key on different servers?

This question is specifically concerned with storing keys in the cloud, and is somewhat applicable. But I've got a laptop and a desktop computer at home - I'm the admin on both of those systems, and ...
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1answer
65 views

PGP Owner Trust Field & Signature Trust Field Distinction

I'm reading Cryptography and Network Security Principles and Practices (5th ed, p584) and reading about PGP keyrings, I'm a little confused about the differences between the owner trust field and the ...
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1answer
156 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 ...
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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 ...
3
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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 ...
3
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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 ...
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2answers
289 views

Signing my certificate by using my smart card and eID card?

In Belgium we have electronic identity cards (eID) issued by our government. They can be read by a smart card reader. On the card are two certificates, one for signing and one for authentication. I ...
3
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1answer
264 views

How secure is to store encryption keys or SSH Keys on LPAR?

I want to store SSH keys (used to connect to some devices that have sensitive data) and the encryption/decryption keys of a database application. They will be inside a LPAR (logical partition) in our ...
3
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1answer
24 views

should ~/.cache/keyring-* be cleared?

I am using gnupg 1.4.15 ls ~/.cache/keyring-* shows many keyring directories. GPG_AGENT_INFO variable is pointing only to the latest one. Should I manually delete all the other keyring agents? Is ...
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2answers
80 views

JKS - Keystore protection and configuration file

It appears that Java Keystore is often used by web server using a configuration file, with the password opening the JKS written in it and also the password protecting the specific entry. How could ...
3
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1answer
589 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 ...
3
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1answer
765 views

Key Management: storing encrypted key in database and decrypted key in session variable

Edit: Rephrased title to hopefully get some interest on what I would have thought was a common issue ? I am developing a website using php/mySQL to store non-commercial data and it will be clearly ...
3
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2answers
160 views

How to properly transition from standard PGP keys to using subkeys?

When I initially set up PGP, PGPTools didn't prompt me to create separate subkeys, as explained in the article "Creating the Perfect PGP Keypair". Now that I've learned a bit more about PGP, I'd like ...
3
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2answers
304 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 ...
2
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2answers
306 views

Can unencrypted keys & logins be kept out of program memory?

No matter what technique is used to store encryption keys & logins, it seems that all roads lead back to program memory (as far as I know), as an unencrypted version of the keys & logins will ...
2
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3answers
977 views

In depth security: splitting key in different places

I use AES encryption on a website. At the moment, the key is stored in the source of the PHP script that does the encryption/decryption process thanks to openssl. I know that it isn't secure, so I ...
2
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3answers
6k 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 ...
2
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1answer
64 views

How to send an encrypted mail only knowing the PGP fingerprint?

How does one send an encrypted email with PGP, when he only has the recipient's fingerprint? I am already sending emails using PGP, but I've just pulled a contact's PGP fingerprint who I need to ...
2
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2answers
423 views

How does Wuala store symmetric key?

As far as I understand Wuala (so called secure cloud storage) is not using the original (user provided) password to encrypt data so what role does original password play in their system? I think they ...
2
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1answer
174 views

Passing generated keys to another process

I am doing a project in which one process generates a key using a distributed algorithm. I need to pass this key to the calling process or procedure. Generally speaking, one can do this in the ...
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5answers
164 views

Does publishing the md5sum of a private key compromise the private key in any meaningful way?

If I have a 4096 DSA private key used for signing binaries, and I want to ensure that a partner has an identical server using the same private key, can I send the md5sum of the private keys over an ...
2
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3answers
158 views

AES Key Management / How To Swap Encryption Key

I'm currently using AES 256 for the encryption of my web application and the security policy context specifies that the encryption key must be replaced once every few months. When that happens what ...
2
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2answers
879 views

Encrypt+Signing data: PKCS#7 / CMS or do-it-your-own way?

Currently I'm saving an array of AES keys into a keychain as JSON, saved as a text file / SQL text column: { [ { encryptedAesKey:RsaEncryptedBytesBase64Encoded==, ...
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4answers
2k views

SSH: reusing public keys and known-man-in-the-middle

Usually, people recommend to use a single private-public key pair everywhere (if we're not talking about a possibility of compromising the private key): Best Practice: “One per-user ssh key” or ...
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2answers
125 views

Distributing public keys; with or without a sub-key?

Most of the public keys I am getting from friends have a sub key in addition to the pub key. For educational purposes I retrieved some public keys and came across this Linus Torvalds' key that does ...
2
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1answer
404 views

Using Diffie–Hellman key protocol to create a safe secret key

Let's say, I have a friend far from me and I want to send some secret messages to him. I have to say, I'm pretty newbie in security. That's why I'm wondering, does the Diffie–Hellman key exchange ...