A public-key infrastructure (PKI) is a set of hardware, software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. In cryptography, a PKI is an arrangement that binds public keys with respective user identities by means of a ...

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Best practices for GPG user ids

What is the best practice for choosing GPG user id(s)? I've read various bits of advice, which sometimes even contradict each other. For instance, I've read that one should not use comments, because ...
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2answers
100 views

What would cause a server to only send over 1 SSL certificate to a client?

We have a secure server that seems to only be sending over the identity certificate. Running the hostname through Qualys says that only 1 cert was provided. The intermediate had to be downloaded on ...
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54 views

Temporarily suspending a Certificate Authority's Certiticate

The PKI RFC talks about revoking or suspending certificates. It also talks about revoking CA certs. However, I could not find anything about whether a CA or a Sub CA's certificates can be revoked or ...
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1answer
48 views

Anonymiszing sensitive data in MySQL DB while retaining searchability

I have a MySQL database that stores sensitive (personal) data about individuals; and have been tasked with ensuring that this data is encrypted in some way to protect the individuals and their data if ...
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1answer
57 views

Chat encryption system avoiding protocol sniffing and then key+decryption replay?

I'm working on a chat system and I want to add it some kind of security (not just HTTPS with SSL since I've read it can be sniffed and decrypted with a few tools). Now, my knowledge in cryptography is ...
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1answer
279 views

Generating ECDSA certificate and private key in one step

Similar to how it can be easily done for RSA: openssl req -x509 -nodes -newkey rsa:2048 -rand /dev/urandom -keyout example.key -out example.crt -days 365 I'd like to generate a ECDSA cert/key in ...
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57 views

OpenTSA and PKCS11

We are planning to implement the time-stamping service(RFC 3161) using OpenTSA wanted to know If OpenTSA supports PKCS-11 (Cryptoki) to talk to HSMs? BTW: I did not find documentation or much ...
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95 views

Automate the process of giving a user access to his encrypted messages, when the user loses his password

I'm implementing a way for users to share messages with other users. All users and admin-users have a unique key pair. A message can be sent from one user to multiple users. Admin-users, who always ...
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70 views

How will SHA1 deprecation affect internal CA's?

I am hearing that the SHA1 Deprecation notices from MS/CHROME only apply to certs that are a part of a public trusted root program. This makes one believe that IE will have new logic built in to allow ...
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41 views

Protecting data on a remote device

Background I have am developing a service which consists in a small headless client device (e.g. OLinuXino) which will contain sensitive data. The device will be plugged to a remote network (maybe ...
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27 views

Key management for hosting applications

We're looking to host a number of client applications in our environment. Some of those will use crypto, e.g. for ssl or database encryption and obviously we'll need to manage keys for that. I am ...
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38 views

1.3.6.1.5.5.7.1.12 Logotype extension - how can it be generated from openssl command line

If you look at this subCA Certificate from Verisign http://www.tbs-certificats.com/FAQ/en/495.html?p=en/495.html It has the following field 1.3.6.1.5.5.7.1.12: ...
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230 views

Import securely RSA private key through PKCS#11

I have a cryptographic device that supports the following mechanisms: How I could securely import RSA private key into it? Because there is no support for wrap/unwrap using symmetric key is there ...
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0answers
33 views

Message and Key Security

I'm reading Post-Quantum Cryptography, and in the page 106 in the beginning of the Section 3 it says: In this section we consider the message security (opposed to key security) of code-based ...
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0answers
73 views

Do SSH private keys always contain enough information to derive a public key?

I am working on a persistence model for SSH Private keys. The technology used is Java. Since the persistence structure of the public and private keys is pretty similar and using some of the Java APIs ...
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0answers
58 views

Public/Private key validation

Suppose I have this scenario: User --> Inputs License Key --> I validate it --> If success, good, move onto main window. If not, prompt the user to reenter the license key. The license key will not ...
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0answers
63 views

How can I generate some public and private keys on both sides with low overhead?

We have an Authority Center (CA) generating some public and private keys for each client (more than one pair for each client). One method for sending keys to client is sharing a secret key between CA ...
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33 views

Secure access of web application on a newly created AWS instance using the associated keypair

I create an AWS instance using a private AMI (Linux) with an embedded web application (Jetty) which is activated on instance start. As soon as the instance is launched first time, I want the ...
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0answers
67 views

Openssl command line: How to get “Policy: X509v3 Any Policy” in a certificate I am generating through openssl

I am trying to generate a certificate through openssl which has the following line X509v3 Certificate Policies: Policy: X509v3 Any Policy But I end up getting X509v3 Certificate Policies: ...
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32 views

Breaking public key pinning

I was reading through the IETF's Public Key Pinning Extension for HTTP (http://tools.ietf.org/html/draft-ietf-websec-key-pinning-12). The acknowledgements section has the following: Thanks to Trevor ...
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25 views

Looking for OpenSC compatibile token

I am currently proud user of Feitan ePass2003 with OpenSC, however it is not 100% reliable on Windows, on Linux it's just perfect. Anyway I started to looking and I have two candidates eToken Pro 64K ...
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48 views

Possibilities for “Service digital identity” field for a service of type http://uri.etsi.org/TrstSvc/Svctype/RA

In ETSI TS 102 231 sec. 5.5.3 Service digital identity, says about "Service digital identity": ... When using public-key technology (i.e. PKI), this field MUST be a representation of the public ...
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39 views

How do public/private keys work?

I have read "How does SSL/TLS work?" and "Public-key cryptography", and I know basically what happens when using a Public-key to encrypt/decrypt something. To sum up what I've read, A Public-key ...
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24 views

Webpage signature

Is there a way to sign each post of a provided hosted blog (wordpress.com in my case, not .org) with my private key? The goal is to provide the signature (at the end of each post) along with the ...