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Results tagged with public-key-infrastructure
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user 38377
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 certificate authority (CA). There are three main categories of PKI: Web / SSL certs, corporate networks, and Government ID / ePassport.
116
votes
4
answers
245k
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Can I add a password to an existing private key?
Say I have previously created a private/public key combination, and decided at the time to not protect the private key with a password. If I later decide to "beef up" security and use a password-prote …
- 6,935
33
votes
1
answer
33k
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Are SSH keys and PGP keys the same thing?
I have a 3072 bit RSA key that I generated for use with SSH. Can this key-pair be used with PGP/GPG, or do I need to generate a new pair of keys separately for use in email encryption?
Are the two in …
- 6,935
16
votes
4
answers
2k
views
Is there any reason someone wouldn't use a longer key?
Larger key sizes are said to be more difficult to bruteforce; is there any reason someone would then decide to instead use a smaller key?
Is there any negative effect in using a larger key size, such …
- 6,935
11
votes
4
answers
13k
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What benefit is there to adding a password to your SSH key?
If you run the following command on a Linux/Unix machine, among other things, you get a prompt for a password:
$ ssh-keygen -t dsa
Enter passphrase (empty for no passphrase):
What does adding a pa …
- 6,935
8
votes
1
answer
5k
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How long do keys stay on keyservers?
Do GPG/PGP keyservers "garbage collect" old keys which have expired, been revoked, or simply haven't been updated in a decade? Or does the server (theoretically) keep every key it has ever seen from t …
- 6,935
5
votes
2
answers
2k
views
Does adding multiple recipients to an encrypted message decrease security?
Let's say you want to send the same GPG/OpenPGP encrypted message to 50+ recipients. Assuming everyone you send to is trusted, and there is no risk of any recipient leaking their secret key, is sendin …
- 6,935
3
votes
1
answer
1k
views
What happens if my signing subkeys are compromised?
Let's say my subkeys are compromised, but my master keypair is safe and secure, so I revoke the old subkeys and issue new ones.
With encryption keys, the results are pretty clear: I can still decrypt …
- 6,935
2
votes
1
answer
447
views
Which PGP settings have been found to be vulnerable?
Digging through articles, one often finds recommendations such as "Use the default key type/size X", whereas an article written a few years later will write "Key type/size X has been found to be vulne …
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2
votes
2
answers
763
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Does public key encryption/decryption speed actually matter?
There have been wars fought over RSA, DSA, and I'm sure other public key encryption algorithms, and usually the arguments are "Algorithm A is faster to encode, but algorithm B is faster to decode".
H …
- 6,935
1
vote
1
answer
123
views
Is there any benefit to providing multiple types of public keys?
Say I have a page on my website which lists public keys to be used in case people would either allow me access to a server, or send me encrypted information.
Is there any benefit to me providing diff …
- 6,935
1
vote
3
answers
434
views
Where do my keys come from for requests over SSL? [duplicate]
From what I understand, when you send information to a website over SSL, you encrypt the information you send with their public key.
However, if you want to be able to decrypt the information they re …
- 6,935