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

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Sharing RSA keys between PGP and SSH protocols: Does this pose a security risk?

If I generate a PGP subkey that only has the authentication capablity and use this to generate an SSH keypair to authenticate Git for example, does this pose a security threat? When I do, should I ...
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1answer
858 views

Short OpenPGP key IDs are insecure, how to configure GnuPG to use long key IDs instead?

Short OpenPGP key IDs (with 32 bits / 8 hex characters) are subject to collision attacks. It is strongly recommended to stop using 32 bit IDs: Stop using 32bit key ids It takes 4 seconds to ...
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1answer
2k views

how to secure Android Market public key

Android's security manual says that it is not safe to keep market public key just as a string and it should be hidden/encoded somehow. I am new to android Can somebody please provide me with example ...
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5answers
293 views

Should I generate new SSH private keys for each machine I work from?

I hope this is an appropriate place to ask this question. I've been thinking recently about public and private keys, and I'm wondering what the best practices are related to management of my own ...
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4answers
115 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 ...
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3answers
150 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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2answers
2k views

When should I use Message layer encryption vs transport layer encryption

Basically I will be having to secure a connection between different hops. Therefore even if TLS is widely known to be the best in class, I am wondering that in such a case message based encryption ...
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1answer
3k views

JSON Web Tokens - How to securely store the key?

I was building a RESTful Web Service when I came across JSON Web Tokens as an alternative to traditional cookies for authentication. The concept core of this method is that the server is the only ...
4
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1answer
285 views

Unique SSL keys for load-balanced hosts

Given a setup with multiple SSL-terminating load-balancers in a failover configuration, is it a bad idea to have a unique TLS private key for each one of the hosts? They would all share the same FQDN. ...
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1answer
4k 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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1answer
66 views

Infinite one time pads, brute force multiple pads?

So based on my understanding using the same key for encrypting two completely random plain texts when using an otp cipher will still retain perfectly secret. This is based on the answers on this ...
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1answer
3k 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? ...
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3answers
695 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 ...
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2answers
190 views

Question about the SessionLock paper

Some time ago there was a big fuzz over Firesheep: by listening to wifi traffic your login session can be stolen which is very bad because now somebody can e.g. send emails on your behalf. Some people ...
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3answers
465 views

Are there any serious problems with this technique for generating symmetric keys?

I'm using a technique borrowed out of a book by Bruce Schneier and Niels Ferguson called Practical Cryptography. Basically, it boils down to this: Bob does this: pubk_A = Alice's public key ...
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1answer
237 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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1answer
163 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 ...
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1answer
4k 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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1answer
3k 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
313 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
435 views

Storing License Keys

I'm creating an application which generates licenses key and stores this in a database (the licenses are checked online). I don't wish to store these license unhashed, in case the database is stolen. ...
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1answer
551 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 ...
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1answer
1k views

Symmetric key management

I am currently employing GNU Crypto in Java and I am now deciding on the best way to store the keys. The question Storage of 'secrets', keystores, HSMs and the rest has led me to believe the ...
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1answer
237 views

Key Management for PCI and Payment automation

We're a bootstrapped startup looking to achieve PCI compliance, we've almost nailed all requirements but I recently came across this blog post which totally derails our plans and efforts : ...
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3answers
285 views

Security in wireless ad hoc sensor network (without physical access)

I want to know without taking physical access, what are the methods that can steal the data in a node. When talking about eavesdropping, how can an attacker sniff the packets? Do they need to listen ...
4
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2answers
145 views

Securing HSM-stored symmetric data encryption keys (AES) in memory on server

My project requires me to encrypt sensitive user data using symmetric data encryption (AES). I will be storing the AES key (DEK) in a HSM-based key management service (ie. Azure Key Vault / AWS KMS) ...
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1answer
889 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 ...
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2answers
509 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 ...
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1answer
196 views

Can I ask GPG keyservers to name all keys signed by a particular key?

Given the alleged possibility that an adversary might attempt to acquire my (OFFLINE) Secret Certification Key and Passphrase and sign other keys with it, including a key they made with my ...
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1answer
1k views

Help understanding PCI-DSS when using password based encryption from automatically generated keys

I've inherited the task of self-auditing an e-commerce system for compliance with the PCI-DSS. We are storing the PAN in our database in encrypted form using 256 bit AES algorithm to do the ...
4
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1answer
108 views

My OpenPGP private keys are set up with sub-keys. What happens if I revoke a sub-key and re-issue a new one?

I have set up my OpenPGP keys with sub-keys, following the general instructions laid out in "Creating the perfect GPG keypair." The general gist is that you create a "master keypair" which is not ...
4
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1answer
57 views

Merge a second OpenPGP key pair into user id of other key

I have OpenPGP key pairs for two of my email addresses. When I created them, I did not know that it was possible to just add another user id to the first key pair. Then I found out it is possible from ...
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2answers
265 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 ...
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2answers
711 views

Is Google API Key a sensitive information that needs to be protected?

I'm making use of google API for location (in Android, iOS apps).. Can the key be hardcoded? Or should it be protected? If It's sensitive, why is it sensitive and how can attackers exploit this?
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2answers
960 views

Managing and deploying web app passwords

What are some best practices for managing and deploying web app passwords and private keys? E.g. the password to access a database or external services like the Facebook API. I'm referring generally ...
4
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2answers
84 views

Centralized key management for IOS and Android Code Signing

What is the best way for an enterprise to manage code signing certificates? The default seems to be that Apple and Android keys get stored by each developer on their machines. I see systems like ...
4
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1answer
157 views

Does RekeyLimit property in sshd_config enforce re-keying / key re-exchange?

I have set the RekeyLimit property in sshd_config and tried to perform a SSH. However, I could not see rekeying happening in the verbose logs, all I see is the log message below at the start of the ...
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4answers
1k views

Asymmetric crypto: Decrypt own messages without having private key

I have built a messages system for my website. Users can send the admin messages which are stored in the DB after being AES-encrypted. I think that using asymmetric crypto (RSA through openssl) ...
3
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1answer
1k views

How to encrypt the data such that only the user (owner) can decrypt them

Here is the system: The client side of our system generates confidential data that needs to be encrypted. Only the user should be able to read them, by that, I mean that even us who managed the data ...
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4answers
319 views

Are there Ciphers designed to be slow?

To safely store a passwords, it is better to store them hashed using a hashing function designed to be slow like bcrypt. The goal is to trump brute force attacks. Are there any ciphers slow enough to ...
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3answers
4k views

RSA 4096 with AES 256 Encryption Process Using PyCrypto

I have the following process for encrypting and decrypting data in a python script using the PyCrypto module: Encryption - Server A AES 256 shared key is generated Associated IV is generated Data ...
3
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3answers
254 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
557 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 ...
3
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2answers
988 views

How to store an encryption key on shared hosting?

I am designing a simple online patient management system that is running on shared hosting. According to national regulation sensitive data should be encrypted when used online, so I have encrypted ...
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2answers
2k 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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3answers
158 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 ...
3
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2answers
132 views

Does Intel or Arm support private key memory?

I know some security processors have an isolated bus where you can store a private key and use it with hardware encryption without the key ever being stored in memory. Some even have key storage ...
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2answers
849 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 ...
3
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2answers
285 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 ...
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4answers
3k 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 ...