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

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3answers
665 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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6answers
2k 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 ...
2
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1answer
149 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 ...
2
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2answers
667 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==, ...
2
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4answers
1k 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 ...
2
votes
1answer
257 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 ...
2
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2answers
83 views

RSA key exposure

Is there any limit to the number bytes that an RSA key can be used before it can be exposed. In Symmetric encryption a Key is not recommended to be used to encrypt more than specific amount of data ...
2
votes
1answer
163 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 ...
2
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1answer
375 views

AES key management

I am encrypting a secret in a db field. I am encrypting using AES with a 256-bit key and a random IV per encryption. They AES key is hard coded in the code. Each IV is stored in clear in another ...
2
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1answer
159 views

Security of re-encryption with a list of pre-computed password based keys

I have a problem where an encrypted file stored on a server needs to be decrypted through a precomputed list of passwords that are used one time only - OTP applied to encryption basically. The file is ...
2
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2answers
2k views

DUKPT - Sample data other then in X9.24

I wrote some code that does PIN encryption/decryption according to rules in X9.24. It works great with examples provided in ANSI doc, but doesn't work with actual device from the client. Where can I ...
2
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1answer
114 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, ...
2
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1answer
47 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 ...
2
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1answer
1k 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 ...
2
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2answers
162 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 ...
2
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1answer
3k views

Where to store Java keystore password?

We are going to have a Java Key Store which will store certificates & public/private keys. This keystore will be protected with the password. However, access to the keystore is only from the ...
2
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2answers
128 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 ...
2
votes
1answer
467 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 ...
2
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2answers
44 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
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2answers
433 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 ...
2
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2answers
121 views

Is there a hard-to-spoof identifier associated with a physical hard disk

I would like to salt the pass phrase with the drive id in such a way that, if the disk were imaged to a new drive with a different id, (e.g. by a government forensics specialist) then the image would ...
2
votes
1answer
146 views

Where can I find resources to help me implement a key server?

I would like to implement a fairly basic but nonetheless robust key server for generating and managing symmetric encryption keys. Are there guidelines or best practices out there that I should peruse? ...
2
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2answers
187 views

Why doesn't Bitlocker mix the password with stored key?

Bitlocker doesn't support USB key + PIN (password). The reasoning was "the password is too weak to provide additional security". Isn't that flawed? With a USB key and password, I've got some level of ...
2
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1answer
132 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 ...
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3answers
4k 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 ...
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2answers
174 views

Using 1-day expiration GPG keys only… any disadvantages?

From the thread Does GPG key expiration add to security? , we know that the faster the keys expire, the greater our security. The minimum expiration for a GPG key seems to be 1 day. Thus, isn't it ...
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2answers
100 views

Are there any systems to mitigate the risk of losing a Signing Key?

I want to design a system that hinges on ECDSA. All messages are signed using the algorithm, and this is used to prevent spoofing. However, if a user were to somehow lose control of their key, they ...
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2answers
304 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 ...
1
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1answer
220 views

AES128 and IV for app crypto

We have some columns in some tables that are sensitive and would like to protect them "anyways". Also, since Azure SQL demands application level encryption, we have to roll our own. There would be a ...
1
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1answer
361 views

How to process or manage Key-Encryption-Key using HSM?

Let's consider two Encryption keys: 1.Data-Encryption-Key(DEK) 2.Key-Encryption-Key(KEK) KEK will be securely stored in HSM, which will be encrypted using master key. Data Encryption Key will be ...
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1answer
108 views

Advice on using encryption for self training app

I am self training on using encryption. I am a php developer and in my spare time I am building an online app that provides basic cms features to help me understand encryption design more. I am using ...
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1answer
515 views

How to protect encryption key while application is using it

I made an J2SE application that uses AES (in CBC mode using BouncyCastle library) to encrypt application config file & some user provided files. I stored the raw AES key in a file that is ...
1
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1answer
963 views

Google custom Search Engine api key: is it confidential?

Normally, I'd say yes, api keys should be kept secret, and Google's api console even says that. However, I'm just making an ajax get call and all the info is in the clear on my page in order to ...
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2answers
1k views

Need example and working Security Token Service (STS)?

Can anyone explain or post any link to a simple example and introduction about the Security Token Service (STS)?
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1answer
50 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 ...
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2answers
60 views

How to setup cronjobs that do scp without saving the .pem file on either of the machines

I have the following situation and want to know what are the best practices to do such things without exposing myself to security issues I have two servers both use the same private key for login. ...
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1answer
119 views

Security implications of setting the same password on private key and PKCS12/JKS?

Are there any negative security implications of setting the private key password (DSA in this case) as a PKCS12 (and then JKS) export password (instead of generating/inventing a new one)? My use case ...
1
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1answer
61 views

How to restrict access to a resource based on frequency of access?

I want to restrict access to a particular resource based on time (configurable). So suppose user A has time t configured from him. He can access the resource only once every t time units. The values ...
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2answers
291 views

How do I import a PKSC#12 private key into Java 5 (which may require PKCS#7)

I have a newer private key I have to import into an older server. How do I take a newer PKCS12 cert and import it into an older version of java that uses a different format?
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3answers
564 views

Validate hmac with hashed stored key

What if an HMAC is correctly generated and sent with the data to the server, so far I know the server needs to know the original data with which the MAC was created in order to re-create the MAC and ...
1
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1answer
153 views

How dependable can data encryption be without re-entry of password on startup?

I posted a comment awhile back, and thought I would turn it into a question. Example: There is a feature in the Microsoft SQL Server for full database encryption, which seems to have an option that ...
1
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1answer
761 views

How do I securely store and retrieve a many-time use key?

I am performing some symmetric database encryption/decryption in .net. I am using a single 256 bit private key. (1) Where do I store this key when not in use? (2) How do I securely retrieve this ...
1
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1answer
52 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 ...
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2answers
110 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
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1answer
100 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 ...
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2answers
107 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 ...
1
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1answer
45 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 ...
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2answers
224 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 ...
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1answer
249 views

Pgp Private key storage on windows server advice

Looking for a bit of advice really, here's the situation: I currently have a security minded client who will be sending PGP encrypted files. I have to decrypt the files on my server before ...
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1answer
122 views

Which is best DPAPI or HSM?

Can you please explain what's is the main difference between for this both DPAPI and HSM? As far as I understand both protecting the data, the way of protection is difference HSM is physical device ...