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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4
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3answers
84 views

How can I create a unique identifier that can not easily be reversed?

I've been working on the design of a longitudinal study and one requirement is: all participants will have a unique identifier that is not reversible from the data storage/analyst side of the study ...
0
votes
1answer
40 views

PGP Key publishing on MIT PGP Public Key Server [duplicate]

I have a public pgp key, so that users can send me an encrypted message. Ofcourse, any user that wants to send me a message, wants to verify that the public key (s)he has, really belongs to me. From ...
0
votes
1answer
66 views

Two-factor encryption model [on hold]

Please some on help me to understand this "Are you ready for this? With the two-factor encryption model your data is protected two-fold. First, a unique key is generated, encrypted, and turned into ...
2
votes
1answer
169 views

Openssl adding a telephone number or cell number to the distinguished_name

In the openssl.cnf file, I see fields like countryName, stateOrProvinceName etc which are typically present in the distinguished_name. Where can I get a list of fields which can be added to the ...
0
votes
1answer
72 views

Compromised submarine cables and the consequences to internet?

I recently read an article that Google wants to build a submarine cable connecting to my country supposedly to increase overall speed and while I hope my government will never allow this kind of thing ...
0
votes
0answers
26 views

Security schemes regularly in use on cloud

I've been looking into how connections are managed in the cloud, in order to better understand the threats users and their deployments may face. The most important and common ones in use seem to be ...
-1
votes
1answer
37 views

How do openvpn/easy-rsa generated keys map to RSA algorithm variables?

I was reading up a little on openvpn and pki infra and am confused by some of the questions posed by my colleague. :) This answer did help me understand more: ...
0
votes
1answer
8 views

Web of Trust: What is “signatory trust”?

I am learning about the Web of Trust and how to use it. However, I have some issues to fully grasp the concept of Signatory Trust. What is an easily understandable definition of signatory trust? An ...
2
votes
1answer
96 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 ...
2
votes
1answer
21 views

Is there a way of achieving perfect forward security with one directional messages?

Using for example ECDH and ephimeral keys, it is possible for two parties to establish a shared key with perfect forward security, i.e. even if the long term keys are lost, it will not be possible to ...
3
votes
1answer
42 views

Installing a CA only for specific domains

For many reasons, it's often convenient for organizations to have their own CA (self-signed or otherwise). As I understand it, adding the CA certificate to a OS or browser will make it trust the ...
1
vote
0answers
38 views

Key derivation of public key without knowledge of private key? [migrated]

I'm looking for a convenient way to share a set of public keys across multiple services, while preserving privacy by preventing these services from tying the identity of these public key sets together ...
2
votes
0answers
23 views

How do I create an exchange certificate with openssl? [migrated]

We've been using makecert to generate certificates for testing, and in some environments, we have access to Active Directory Certificate Services, for which we have certificate templates we can use to ...
3
votes
1answer
44 views

What encryption and signature systems (don't?) allow for plausible deniability of the OP's key being used?

I need to prevent Mallory from blindly matching encryption and signing keys to messages Hypothetical scenario: A user creates a public key An encrypted or signed payload exists. With only public ...
1
vote
0answers
27 views

Distribute S/MIME public keys and CA cert for email security

I have my own CA. I want to distribute S/MIME certificates for 10 different users. I saw S/MIME keyservers from http://wiki.cacert.org/KeyServers, but I don't want to use public servers. What is the ...
2
votes
1answer
35 views

Smartcard - main differences between .NET and Java smartcard?

My question focuses on the differences regarding PKCS11 implementation between a .Net and a Java smartcard. More generally, do smartcard use a specific "OS" (or firmware) and only differ in the ...
1
vote
1answer
31 views

Banking card certificate

Does anyone have an idea of what kind of public-key technologies are used in the bank perimeter ? Does banking card embedded x509 certificate ? OpenPGP ? Perhaps a standard exists or a de-facto ...
3
votes
1answer
52 views

PKI - Why Root CA is in intermediate CA section?

I can't understand why, when I accept to "install" a custom self signed Root CA on IE browser, the root certificate ends up in the "intermediate CA" section, rather than in "Root CA" section in the ...
4
votes
1answer
75 views

PKI Installation

I must install a PKI in my organization. I work in a windows environment. I already set an offline CA. I must now install a subordinate CA. I have the choice between installing the subordinate CA on a ...
1
vote
3answers
62 views

How to avoid identity theft at key signing parties?

Let me begin by distinguishing two kinds of identity theft: Conventional identity theft (e.g. using credentials from ID documents, bank accounts, etc, to commit fraud or other mischief). ...
47
votes
1answer
3k views

Why does Windows Ship with Expired SSL Certificates?

I am cleaning up the certificate stores on my Windows machines, and considering which certificates I should keep, and which ones I should delete. Why does a fresh install of Windows Server 2012 R2 ...
10
votes
1answer
175 views

Is TLS in Tor useless?

I am trying to optimize the Orchid Tor client library for my needs and noticed that every connection with every node uses TLS with turned off certificate verification. Actually there are no TLS ...
1
vote
0answers
31 views

Use of RSA in Yaksha Security System

So I'm reading over the Yaksha Security System and see it is based on the RSA cryptosystem and a centralized server, easy enough. What I'm slightly confused on is the math behind the related keys. It ...
0
votes
2answers
45 views

SHA1 - S/MIME and CRL validity after deprecation?

In an internal PKI using SHA1 for hashing, will S/MIME signature and CRL/ARL signature be considered invalid in the next few years (SHA1 Deprecation) ? End certificates can be revoked, CA ...
0
votes
0answers
45 views

How should I organize my keys?

Suppose I have a set of computers with variegate level of trust (for example): I fully trust my own desktop pc at home I trust a bit also my smartphone, but I know it could be stolen I trust a bit ...
0
votes
0answers
41 views

Is ADCS overkill just to replace self-signed certs?

Several of our internal applications are either not using SSL certificates, or are using self-signed certificates. I wanted to utilize ADCS to create a trusted, internal-only root CA that our browsers ...
13
votes
2answers
1k views

Does it matter which key is considered private and which public?

Mathematically, is there a difference which set of characters is private_key and which one is public_key? @Edit At the moment of asking I was thinking on RSA, not asymmetric crypto in general.
0
votes
2answers
46 views

Certificates - What about signing again Intermediate CA certificates?

I an thinking about this issue and it is hard to estimate technical impacts. For any relevant reasons, one want to modify one the x509 field of an intermediate CA. This intermediate CA was signed by ...
0
votes
2answers
50 views

Subordinate Certification Authorities and managed certificates

How many different certificates can a subordinate certification authority manage? Please, supply me also some reference. Thanks
-1
votes
2answers
99 views

Encrypt files on FTP server

I have a practical situation here, my company is a FTP server provider for some clients. The clients are sharing their files on our FTP server and have had no problem with access management and ...
0
votes
1answer
63 views

PKI - Security concerns when changing a certificate hash algorithm

Suppose I want to change the hash algorithm used for a certificate signature (ex: SHA1 to SHA2). Is it better to revoke the previous certificate and issue a new one with expected hash algorithm ? Or ...
2
votes
1answer
87 views

Why can't I upload a new ECC key to key servers, which is supported by GnuPG 2.1?

My OpenPGP key is soon to expire so I wanted to create a new one. GPG 2.1 came out a month ago including ECC support and I wanted to try the new key types. So I have generated a brand new ed25519 ...
3
votes
2answers
81 views

Corporate PKI - SHA1 deprecation

Here is the context. Suppose you have a corporate PKI with : AC_Root (offline in safe store - SHA1 signature) SubRootA and SubrootB (offline in safe store - SHA1 signature) SubSubRootC, SubSubRootD, ...
1
vote
1answer
25 views

Definitions of PKCS#11 abbreviations

Is there a complete definition list for all CKx abbreviations in PKCS#11? I believe I gathered most of them: CK = Cryptoki CKA = ... Attribute CKC = ... Certificate type CKD = ... Key derivation ...
2
votes
3answers
74 views

Email Encryption

I'm hoping someone can point me in the right direction. If I wanted to implement email encryption within an organisation what would be the best way? I've been searching the web tonight but all my ...
0
votes
0answers
60 views

Why is the public key extracted from the CSR different than the one extracted from the associated certificate?

I am playing around with pyopenssl. I am trying to extract the public key from a CSR and to check if it is the same than the one I find in the associated certificate. There is a small difference ...
-2
votes
2answers
42 views

Get the Signature algorithm from a public key? [closed]

When I do PublicKey.getAlgorithm(), it only returns me RSA. Am looking for something to return Sha1RSA. Basically to identify if it is a sha1 or sha2 algorithm. Any help is appreciated. Thanks,
1
vote
1answer
118 views

Authenticated Diffie Hellman Key Exchange

It appears that the textbook version of Diffie-Hellman is susceptible to man in the middle attack and the use of digital signatures could prevent this attack from occurring. Digital signatures could ...
1
vote
1answer
35 views

How to understand socat certificate check limitation?

I have set up a certificate-based connection with socat using this tutorial: http://www.dest-unreach.org/socat/doc/socat-openssltunnel.html My socat connection works as following (only the relevant ...
-1
votes
1answer
72 views

How is PKI used to encrypt an e-mail for multiple recipients?

My understanding is that when an e-mail is encrypted and sent to a recipient, the recipient's public key is used to encrypt the e-mail, and then only the recipient can decrypt it with their private ...
1
vote
1answer
594 views

SSL interception with Burp Suite using Firefox - Strange behavior when intercepting twitter

I am learning Burp Suite(Free Edition v1.6). I have set it up with the default settings. The proxy listener is listening to 127.0.0.1 on port 8080 and Certificate option is set to 'Generate CA-signed ...
0
votes
1answer
235 views

How can the private key be obtained in PKI without alerting a third party? [closed]

For example, I sent a message to Ardi and encrypted it with Ardi's public key. Ardi must decrypt the message with his private key. How can Ardi's private key be obtained in PKI without anyone else ...
2
votes
2answers
84 views

Distributing public keys; with or without a sub-key?

Most of the public keys I am getting from friends have a sub key in addition to the pub key. For educational purposes I retrieved some public keys and came across this Linus Torvalds' key that does ...
0
votes
1answer
159 views

Shall I set “RSAAuthentication yes” in sshd_config if I use only ECDSA key?

In a context of proprietary client boxes and servers, I want to limit authentication to ECDSA keys. Historically, "RSAAuthentication yes" was used to enable authentication with RSA and maybe DSA keys. ...
3
votes
1answer
968 views

Reset Windows trusted certificates store to its default

Over the time I have installed several additional trusted CA certificates to Windows trust store, sometimes because an app pushed me to do so, some other times for development and testing. Is there ...
1
vote
2answers
92 views

What's the benefit of hybrid cryptosystem vs asymmetric for small data blocks?

It's a common belief hybrid cryptosystems are better than asymmetric only. Is that allways like that? What's the benefit of using symmetric and asymmetric encryption for small data blocks (< 100 ...
1
vote
1answer
74 views

How long can a pkcs#8 passphrase be?

A program is using a private key to read messages. To improve security, besides randomness, I'm trying to create the longest passphrase that makes sense. How long should it be? After which amount of ...
-3
votes
2answers
195 views

Is “HTTPS” ~100% secure? [duplicate]

Assuming that the user always checks that the address bar has a green padlock and the URL has no typos before logging-in to a trusted website: After he had seen the green padlock and ...
0
votes
0answers
39 views

Attack Vector for Wildcard Cert

So I am looking to the security risks of WildCard Certs, in a previous post most of the questions were answered however I have one follow up question for that. In my instance I use DigiCert, so ...
1
vote
1answer
73 views

Problem with common factor in RSA [duplicate]

In the RSA key generation steps, what if two entities select a common factor to generate n (i.e. p*q1=n1 and p*q2=n2) resulting in gcd(n1,n2) <> 1 ? This will lead to a problem that everyone ...