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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3
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0answers
131 views

What is the openssl equivalent of using java's KeyPairGenerator?

I have been using java's KeyPairGenerator in order to generate public/private keys within a program so that I can encrypt and decrypt files(also using java encrypt/decrypt methods). I want to be able ...
4
votes
2answers
171 views

Why is openssl key length different from specified bytes

I realize this is rudimentary question, but I can't seem to even google diagnose it. Why is openssl key length different from specified bytes? For example when I use the command: openssl genrsa -out ...
5
votes
2answers
89 views

Data Integrity in PKCs

This is a simple question but one which greatly confuses me. When you have a PKC, the public key can be accessed by anyone. Therefore, doesn't this mean that anyone can encrypt data? My question is ...
0
votes
1answer
30 views

PGP Key Servers Verification Mail? [duplicate]

Why do existing PGP key servers not perform e-mail verification? Wouldn't it help the problem of authenticating of public keys? By e-mail verification/confirmation I mean a single e-mail sent to the ...
3
votes
1answer
52 views

GPG key expired on mykeyring, but still valid on keyserver

Can someone help me in explaining this: I have an old and expired GPG key, on my keyring the key lists correctly as expired: myself@mypc:~$ gpg --list-sig --fingerprint DDF70E72 pub 1024D/DDF70E72 ...
10
votes
1answer
225 views

Did D-Link's certificate revocation really only invalidate 1 day (of a six months long exposure)?

I'm trying to wrap my head around the OCSP revocationTime for D-Link's certificate. I recently answered another question and ended up drafting a timeline. That timeline is basically this: Jul 5 ...
4
votes
0answers
131 views

Windows Certificate Services: Is it possible to enroll a SmartCard certificate AND have key archival?

I'm using ACOS5-64 Client Kit, I want to enroll for a certificate with key archival. I tried to do so by duplicating the SmartCard template and checked Archive subject's encryption private key option ...
4
votes
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 ...
0
votes
1answer
64 views

WebCrypto, SOP and Yubikeys

I've been following some discussions on WebApp Security mailing list regarding WebCrypto and SOP policies (100+ messages). One of the things that kind of sprang out was keys held in WebCrypto were not ...
0
votes
1answer
121 views

Certificate - Digital fingerprint vs Signature [duplicate]

What is the purpose of the « fingerprint » section of a x509 certificate, and is there an issue using SHA1 for it ? I understand the certificate signature section, but I can’t see the point with the ...
0
votes
1answer
97 views

Code signing certificate validation by Java

Despite several web search, I can’t find an accurate explanation on code signing certificate validation by Java. Indeed, I am wondering if the code signing certificate (the “final cert”) must already ...
8
votes
1answer
2k views

Has the leaked D-Link windows signing key been revoked?

Recently news broke as to D-Link mistakenly publishing a private code-signing key as part of an open source framework. The D-Link key was leaked in late February, and expired on September 3, it ...
-4
votes
2answers
73 views

Does SSL doesn't work without a secondary Symmetric/Asymmetric session key?

I keep reading that Symmetric session key is used in SSL after handshake only for faster performance but isn't true a secondary session key either Symmetric or Asymmetric key generated by the client ...
1
vote
2answers
187 views

Difference between KMS and PKI

While the PKI System deal with digital certificates life cycle and Key Management System (KMS) deal with keys life cycle. What is the the fundamental difference between them? Is it possible to ...
4
votes
2answers
118 views

Should I add picture(s) to my OpenPGP key?

I'm toying with the idea of creating a pair of OpenPGP keys, and I'm wondering if I should include a picture or two. I know it will make my key a lot bigger, but is it still worth it? I'm thinking of ...
7
votes
2answers
804 views

One website - two different SSL certificates: two different CA's

I have seen multiple questions focusing on multiple certificates for a single domain (e.g.: a.com/example and a.com/example_one). However, what stops an individual from purchasing a certificate and ...
-2
votes
1answer
91 views

how to make non HTTP Applications PK-enabled

I have a server application that is using Winsock2.0 for client communication, this application is a service. The client is also a Windows desktop application and performs few operations. For example ...
5
votes
1answer
124 views

SSL certification path building

Background Some SSL certificates have two certification paths. In other words: the trust-chain can take two paths. I installed all the certificates for one path but that gave an HTTPS error on some ...
2
votes
3answers
173 views

How to deliver an encrypted message to multiple recipients without revealing keys

Let's say I have generated a private and a public key. I create a message and encrypt it with the public key. I deliver this encrypted message and a private key to multiple recipients. Why would I do ...
0
votes
0answers
71 views

Certificate policies extension in Root CA and Issuing CA

I am building new CA chain and PKI and I actually don't fully understand how I should include certificate policies (CP) and certificate practice statements (CPS) as extensions and how to work with it ...
0
votes
3answers
217 views

Transmitting private keys between devices? [duplicate]

I have an app where a users' device create a public/private key and all communication to this user is done by encrypting against their public key, which is stored on a server and sent to other clients ...
0
votes
1answer
77 views

How secure is this security protocol? [closed]

I'm developing an application that will encrypt a bunch of files the client has on their machine and then send them to a server, to back them up. I need to encrypt the files so that other ...
5
votes
2answers
119 views

Understanding Digital Certification as as a whole starting from a normal http request

I am trying to understand the difference between digital signature and digital certification and how they work as a whole together on a high level perspective. I hope gurus here can point to me if my ...
5
votes
1answer
91 views

How can I demonstrate that 3 independent root CAs validated my domain?

I am concerned about the hacking of a root CA and want to buy 3 SSL certs from completely different providers who will independently validate my identity. Then at presentation time, I will send all 3 ...
21
votes
4answers
2k views

Cloudflare's free SSL options require trusting them; what could they do to change that?

Cloudflare offers 3 free SSL options: Flexible SSL, Full SSL, and Full Strict SSL. The article “CloudFlare’s great new features and why I won’t use them” explores the shortcomings of the Flexible and ...
3
votes
2answers
116 views

A potential possibility of improvement of PKI for personal communications

In countries like Germany each citizen has an identity card that is issued by the registration authority. Since the identity of a citizen is, in a sense, created by that authority via assigning him ...
2
votes
1answer
194 views

Managing/Deploying a code signature certificate - Java Applet

I wonder how to manage/deploy a code signature certificate used by the JVM in a corporate context. Suppose you signed a Java applet (executed in browser by corporate users), how do you deal with the ...
1
vote
0answers
261 views

Certificate Transparency, TLS Extension method of serving SCT's

I was curious about how to supply certificate transparency from my web server. There are 3 ways certificate transparency information can be delivered to the client's browser (Source: ...
1
vote
0answers
21 views

Relationship between the validity of license of an accredited CA (certificate authority and the validity of it's certificate? [duplicate]

To more clear, let's see my example: As I know, in Korea, the validity of a CA's license is only 2 years, but the validity of this CA's certificate is 10 years. Why is the valid time of the license ...
3
votes
2answers
1k views

How do session keys in public key cryptography work? [duplicate]

I have read that a session key is symmetric, and it is encrypted by recipient's public key; When "Bob" receives a message, does he decrypt it with his private key and he's then in possession of an ...
1
vote
2answers
189 views

PKI cards - PIN and certificates

My company has introduced a PKI some months ago. We are now able to login in our laptops either with our Windows credentials or with a PKI smart card plus a 6 digits numeric PIN. A part from that we ...
2
votes
1answer
93 views

Generating shared secret key using existing receivers public key and senders private key

I have the public key of the receiver, and the private key of the sender. I want to generate a new key by using the receivers public key and senders private key (also known as the signing key) to ...
4
votes
1answer
116 views

How to verify an OpenPGP key's ownership?

I've added the public key of Diceware creator (please use it as a practical example), I've added it by downloading diceware.wordlist.asc, and I didn't have his key and couldn't immediately find it to ...
2
votes
1answer
147 views

What is the most secure way to digitally communicate between the U.S. and China?

What is the most secure way for two people to communicate digitally when one person is in the U.S. and the other is in China (likely being monitored)? Updated: Here's some additional info: The ...
5
votes
2answers
162 views

What do the terms used in OpenPGP keyserver SKS mean? (sig, sbind, sig3, exp2, Policy, …)

When viewing a key record in a public key server, such as this one, there are lots of keywords used: sig, sig3, exp3, Policy, sbind…). I understand that "sig" probably means a signature, but what's ...
1
vote
1answer
139 views

Confused about RFC 4492: difference between “ECDH-capable public key” and “ECDSA-capable public key”

As per section 5.3 of RFC 4492, I'm confused with the following table: Key Exchange Algorithm Server Certificate Type ---------------------- ----------------------- ...
0
votes
0answers
141 views

How to add a certificate chain to a JKS

I want to setup a KeyStore which contains certificate-chains only. This is required by a PKE system which uses the PublicKey of the desired certificate for encryption an then sends the cipher to the ...
2
votes
2answers
150 views

Internet Explorer - Advanced Properties for Trusted Root Certificates

If you go to IE -> Internet Options -> Content -> Certificates -> Trusted Root Certification Authorities. Now Click on some CA certificates and click on Advanced You can add properties to the ...
1
vote
1answer
99 views

Is it complicated to deploy my own CA?

We want to implement a free solution to sign digitally internal documents. No legal value of this sign are requested. We want to consider to deploy an internal CA. Why is it always said that keeping ...
3
votes
2answers
175 views

Using Different Algorithms in Single PKI

Assume the following Public Key Infrastructure: |Root CA (RSA) |-Sub CA (RSA) |-Sub CA (ECC) Is there any rational that explains why this would not be an acceptable implementation? Is the ...
1
vote
2answers
212 views

What if the Local Windows Cert Store is Compromised?

The diagram below illustrates chaining digital certificates up to a publicly trusted Root Certificate: I have been researching how trusted root authorities (such as GlobalSign or Verisign) are used ...
9
votes
2answers
324 views

Electronic identity and digital signatures - why they are different?

It seems (to me at least) that is is generally accepted that "electronic identity" and "digital signatures" are a different thing. For example, in the Estonian ID card there are two certificates - one ...
5
votes
2answers
112 views

How do I prepare for Certificate Authority end of business?

We are deploying a security solution which uses certificates to validate documents. These certificates are issued by our government-authorized CA. What if in a distant future, the CA who provided us ...
1
vote
1answer
105 views

Should self signed wildcard certs be used?

I think this is more urban legend around where I work than anything. I do not see anything in RFC 2459 that specifically says whether or not they should be used or if there are any known problems with ...
4
votes
2answers
50 views

Extend hierarchical PKI

The figure below shows four simple hierarchical PKIs. A, R, H and N are trust anchors of their PKI. I am supposed to add exactly one certificate so that T trusts G, but not D. Furthermore R must ...
5
votes
2answers
76 views

Understanding digitial certifications

q1) Does that mean that every time information is exchanged, both the original data + digital certification is sent? Meaning data + signature for each and every exchange. q2) Can any kind soul here ...
6
votes
2answers
88 views

Issuing certificates to two departments from same ROOT CA so one does not trust the other

Scenario: We have two departments within IT; Say Department-OLD and Department-NEW. A single internal PKI environment exists and a root CA (singular) is trusted by All endpoints. Problem: ...
22
votes
7answers
3k views

Is there such a thing as public key steganography

One of the drawbacks of traditional steganography is that both parties need to exchange a secret key. Encryption had this problem too but circumvented this with public key cryptography. Are there ...
0
votes
4answers
166 views

Generating SSH keys and sending the private key

I've been looking up on how to set up public key authentication between two hosts on my LAN. I am going to be using a pass phrase with my key pair. A lot of tutorials instruct me to generate the key ...
11
votes
3answers
987 views

Can I expose a passphrase-protected private OpenPGP key? [duplicate]

I have created a 4096-bit key-pair using GnuPG. Can I expose the passphrase-protected private key to an untrusted system? E.g. can I put that key in my Dropbox account or send it to myself as an ...