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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Oracle service public key [duplicate]

What is an oracle service(encryption and decryption?) For public key algorithm, does an attacker need an oracle service?
3
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2answers
412 views

Possible to use a YubiKey in HSM mode to secure a Windows CA infrastructure?

I'm looking for a low-cost Hardware Security module, and discovered that YubiKey has a HSM mode. I'm not entirely clear if this HSM mode is what I'm thinking, but I'd like to use it as the offline ...
2
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2answers
936 views

Extracting the PGP keyid from the Public key file?

is there a way via an CLI tool or some kind of API to extract the PGP KEY ID from the PGP PUBLIC KEY BLOCK ? I did find the hexa value of the key in the binary file, however I guess the position is ...
19
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6answers
1k views

Shouldn't GPG key fetching use a secure connection?

If I run this for example: gpg --keyserver hkp://keyserver.ubuntu.com --recv-keys 0xFBB75451 then does the importing occur in a secure way? I mean does it go over only secured connections? (HKP?) ...
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3answers
327 views

accepted naming convention for public keys/certificates

Is there an accepted naming convention for referring to PKI artifacts? There seems to be a lot of confusion with naming of artifacts. For example, it seems that some people refer to: public keys ...
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1answer
72 views

Bootstrapping dual SMIME certificates for signing and encryption?

To maintain the non-repudiation property of signing while still having escrow for the encryption key, it's recommended to have a separate certificates (and pub-priv keys) for signing (say CertSign) ...
3
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2answers
179 views

Requirements for qualified certificates in DIRECTIVE 1999/93/EC

DIRECTIVE 1999/93/EC at ANNEX I Requirements for qualified certificates states that one requirement for qualified certificates is (a) an indication that the certificate is issued as a qualified ...
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2answers
405 views

Is there a way to negotiate a secret between 2 parties with no prior knowledge?

Is there a way for 2 parties to negotiate a shared secret (for example, a session key) without having a pre-shared knowledge? SSL does this by using asymmetric encryption. Is there any other way to ...
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3answers
2k views

How does an SSL server prove its identity?

This document says that a challenge response authentication proves the servers identity. But is a man in the middle attack still possible if the client does not verify domain name ? Please help me ...
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4answers
11k views

How to achieve non-repudiation?

If I have a message that I need to send to another person, how do I achieve non repudiation ? Is digitally signing the message sufficient ?
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1answer
81 views

What is the meaning of http://uri.etsi.org/TrstSvc/eSigDir-1999-93-EC-TrustedList/SvcInfoExt/RootCA-QC from ETSI TS 102 231 V3.1.2

From Technical Spec http://uri.etsi.org/TrstSvc/eSigDir-1999-93-EC-TrustedList/SvcInfoExt/RootCA-QC a Root Certification Authority from which a certification path can be established down to ...
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4answers
3k views

What alternatives are there to the existing Certificate Authority system for SSL?

Whilst the current CA system works very well for a lot of people, it does put a lot of power into individual CAs' hands, and makes a CA hack potentially devastating for customers and business. What ...
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4answers
2k views

Can an intermediate CA be trusted like a self-signed root CA?

Is it possible within the limits of the X.509 specification to mark an intermediate CA as trusted for a specific purpose, e.g. to verify a VPN, HTTPS etc. server key, just like it would work with a ...
2
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1answer
946 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 ...
4
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1answer
344 views

What are the alternative to PKI certificates in mesh networks?

My particular problem has to do with secure communications over a mesh network (http://en.wikipedia.org/wiki/Mesh_network), in particular man-in-the-middle (MITM) attacks. The difficulty is that mesh ...
11
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2answers
370 views

Is PGP secure against a rogue keyserver?

Imagine Eve taking over the keyserver both Alica and Bob are using. By replacing Alices and Bobs public keys with her own, she can do a man-in-the-middle attack decrypting messages and relaying them ...
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3answers
5k views

Is it possible to use wildcard certificates on multiple devices?

I have a server that I want to use a wildcard cert on. It runs multiple services. I purchase a wildcard cert so that I can protect mail.something.dom, www.something.dom, im.something.dom, ...
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2answers
634 views

Two certificates on smart card

I have a question regarding Swedish gov eID (but I guess it is a pki/smart card general question); Why is there two certificates/keys on the card? Background: In Sweden you can have a "citizen ...
4
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3answers
535 views

How are possible uses for X.509 (SSL) certificates denoted?

X.509 certificates can be used for servers, clients, email, code signing and more applications. http://twitpic.com/6gdxaq indicates that a certificate can have different of these 'capabilities' on it ...
3
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2answers
123 views

Deciding whether to sign someones key

How do i decide whether to sign someones PGP public key? I was looking at some contact pages and they have a request for people to sign their public key. How serious of a commitment is it to sign ...
2
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4answers
9k views

SSL Client Certificate authentication

Is it possible to make a program which uses client certificate authentication with only public and private key (I have not generated any certificate, I have only public and private key). Simply, I ...
2
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1answer
235 views

What is the optimal result for the elliptic curve patent issue?

I saw an article this morning, discussing the fact that RSA and DH may be significantly less secure in the upcoming five years. Although the chance that this will materialize is small, I immediately ...
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1answer
138 views

Posting public key [closed]

Should I put my public key on my website so that people can securely contact me. I have seen personal sites where there public key is at the bottom of the page such as this site by the computer ...
0
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1answer
360 views

Splitting up symmetric key to be able to encrypt using 1024 bit RSA public key

The application which I am writing generates a 256 bit symmetric key everytime it wants to communicate with the server and encrypts the data and sends it to the server. This is to avoid storing the ...
9
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2answers
376 views

PKI solution vendor selection

What would you look for in a (X.509-) PKI solution, and why would you look for that, given the following constraints: Available programming/sw-engineering know how is limited (ie, "OpenSSL with a ...
2
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3answers
324 views

If a MITM has your public key and you are SSH-ing through the MITM, what is the maximum attack it can perpetrate?

Firstly, let me start by saying that I am not attempting to hack anyone or anything (not that I would know how or where to begin, if I were). For illustration purposes, let's call the primary key ...
5
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2answers
601 views

Root SSL certificates and browser support

I have given three certs to be install on nginx AddTrustExternalCARoot.crt PositiveSSLCA2.crt www_example_com.crt So I concat them into a chained cert cat www_example_com.crt PositiveSSLCA2.crt ...
5
votes
1answer
163 views

Password strengthening for PGP

I'm wondering about some of the semantics and security implications of using something like scrypt or bcrypt to "enhance" a password protecting a PGP private key. Essentially, I'm asking about the ...
5
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2answers
400 views

How to implement a Web of Trust?

How to implement a Web of Trust, or something similar? Alice get a public and a private key from the RSA guy. Bob need to send to Alice a nuclear secret code (or his babysiter's phone number). Bob ...
6
votes
2answers
453 views

Why do embedded systems store server's public certificate in ROM?

In the home automation scenario, smart gateway can bridge the many smart devices with Internet. In many cases, a server's public certificate is stored in the embedded system's ROM during ...
1
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1answer
169 views

Generate Keytool Object from CSR

I have to develop an application which uses another application for generating a CSR. After generating the CSR I have to provide this CSR along with a SHA256 hash of the public key to a CA. The ...
5
votes
1answer
769 views

Thunderbird - what happens if Gmail SSL cert gets spoofed?

I use a good MUA: Thunderbird [to read/reply to my emails on Gmail]. So: what happens, if i go to a place, where is public wifi, and someone tryes to sniff my password/username/emails? Questions: ...
10
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1answer
2k views

Renewing Microsoft Certificate Services Root Certificate

We currently have Microsoft Enterprise Certificate Server installed on a domain member machine which issues 1 year certificates to users for authenticating to VPN. We'd like to start issuing web ...
8
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1answer
950 views

Moving from a one tier to a two tier Microsoft Certificate Authority hierachy

Right now we have a single Microsoft Enterprise Root CA which issues certificates to our VPN users for two factor authentication. We're planning to extend use of the CA to issue certificates for RDP ...
8
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3answers
671 views

Does the SSL encryption strength of a website really matter?

When looking to get an SSL certificate one is presented with a lot of options. For example lets take Network Solutions since they have a nice comparison chart. Immediately there seems to be 4 major ...
4
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2answers
3k views
2
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2answers
851 views

Key Exchange using PKI

I'm new to the field of cryptography and trying out a sample program to understand PKI key exchange mechanism. I tried creating a self signed certificate using openssl openssl req -x509 -nodes ...
4
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1answer
2k views

AIA/CRL locations for Offline Root

I've read the answer to the following "Checklist on building an Offline Root & Intermediate Certificate Authority (CA)" and I have one questions based on the system I am trying building It's an ...
5
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2answers
153 views

How can a certificate be valid in the Hybrid Model but not in the Chain Model?

All dates in European format! I am learning about validity models, but the solution for this assignment confuses me. Translation: The relevant data for the applicable certificates are shown ...
141
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7answers
11k views

How do certification authorities store their private root keys?

Knowledge of a CA private key would allow MitM attackers to transparently supplant any certificates signed by that private key. It would also allow cyber criminals to start forging their own trusted ...
3
votes
4answers
9k views

how to import a private key in windows

Say I have an X.509 cert and a private key that corresponds to it. I can import X.509 certs easily enough into Windows but what about private keys? Is the only way I can do that by converting both ...
1
vote
1answer
282 views

generating RSA keys through the browser

HTML5 has the element that sends an SPKAC to the server (as I understand it). But how do you do it in IE? One CA's websites gives me the following prompt: This Web site is attempting to perform a ...
1
vote
1answer
1k views

Does Java's implementation of OCSP and CRL checking handle intermediate CAs?

I've read that Java provides OCSP and CRL checking for CertPaths via: Security.setProperty("ocsp.enable", "true"); System.setProperty("com.sun.security.enableCRLDP", "true"); Do these implementations ...
1
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1answer
283 views

signatureAlgorithm vs. tbsCertificate -> signature

From the X.509 RFC: Certificate ::= SEQUENCE { tbsCertificate TBSCertificate, signatureAlgorithm AlgorithmIdentifier, signature BIT STRING } TBSCertificate ::= ...
6
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2answers
1k views

OCSP and CRLs: Specified in CA or client certificate?

Here's an example PKI setup: * Root CA (offline) * Issuing CA * Client 1 * Client 2 I'd like to specify a CRL distribution point for CRLs generated by Root CA, and an OCSP URL for Issuing ...
3
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1answer
328 views

Internal CA for Digital Signature Solution - PKI Based

I'm trying to set up a digital signature solution which would work with a internal PKI. We have considered Microsoft Certificate Services, but we don't want to rule out any other option to set up a ...
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1answer
110 views

XER encoded X.509 certs [closed]

Would anyone happen to have an example of an XER encoded X.509 certificate so I can play around with it? Thanks!
2
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3answers
695 views

Public key Infrastructure

Here the MD5 hash is being encrypted with the private key of the sender. But I read in a paper that private key is only used for signing and not encrypting. Is the image wrong or can private key ...
1
vote
1answer
182 views

are organizations that receive certificates considered “end entities” in a PKI?

I am trying to understand the term end-entity. Does this term just mean anybody that plays a role in a PKI system that is not a CA? So if I request a certificate from A who is a CRL issuer for ...
3
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2answers
1k views

Checking SSL\TLS servers for null encryption support

I have a web server supporting SSL 3 and TLS protocols , the following are the supported cipher suites. TLS_RSA_WITH_RC4_128_MD5 TLS_RSA_WITH_RC4_128_SHA TLS_RSA_WITH_3DES_EDE_CBC_SHA How can i ...