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

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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 ...
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2answers
448 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 ...
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1answer
184 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
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1answer
923 views

How to use DPAPI under load balance environment

DPAPI can be used to encrypt the secret data. We intend to use it in our web app to encrypt some data and store the encrypted data in database. When needed we decrypt the data and present them on ...
5
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1answer
585 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 ...
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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 ...
5
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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 ...
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1answer
1k views

How to secure API (private key) for mobile apps

I am building a web service that has to be only accessible for iOS apps. In the future I want to expand to a mobile website to make my service also available for other mobile operating systems. Now, ...
5
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1answer
880 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 ...
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2answers
137 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 ...
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1answer
573 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 ...
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3answers
11k views

How to secure SSH such that multiple users can log in to one account?

Consider a generic up-to-date Linux distro hosting a web server. I need three humans to occasionally SSH into the same user account to perform some action that can only be done by that particular user ...
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3answers
163 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 ...
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2answers
296 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 ...
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2answers
520 views

What is the purpose of 'Version:' in PGP public key

PGP public keys look something like -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.9 (GNU/Linux) mQGiBEl2HAgRBAC9IZGQE3NRWFoXV7CcVRbo7xMe+nGPRMTOocA0pcv9N67R6CAZ ... -----END PGP PUBLIC ...
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3answers
2k views

What does it mean for a digital certificate to be “signed”?

When someone says that a particular digital certificate (like an SSL cert) has been "signed with a key", what does that imply? Does that mean the certificate simply includes a key that should be used ...
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4answers
84 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 ...
4
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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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2answers
1k 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
126 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 ...
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2answers
3k views

mysql AES_ENCRYPT key length

AES_ENCRYPT uses a 128 bit long key to encrypt the data, but how does mysql handle longer or shorter keys? I found out that pycrypto for instances recomend to transform the key by using md5 sha1 sha2, ...
4
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1answer
104 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 ...
4
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1answer
220 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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2answers
153 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
420 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
115 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 ...
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1answer
114 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
316 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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2answers
3k 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 ...
4
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1answer
784 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 ...
4
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1answer
211 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
262 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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1answer
777 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 ...
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2answers
108 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 ...
4
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1answer
108 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, ...
4
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1answer
269 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 ...
4
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2answers
238 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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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) ...
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3answers
181 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 ...
3
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4answers
228 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
3k 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
114 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
votes
2answers
418 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
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
452 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 ...
3
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3answers
129 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
108 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 ...
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4answers
478 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 ...
3
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2answers
324 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 ...