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9
votes
1answer
6k views

New PGP key: RSA/RSA or DSA/Elgamal?

I wanted to create a new PGP key using GPG Keychain Access on my Mac. One of the options was to choose keytype: RSA and RSA DSA and Elgamal RSA (Sign only) DSA (Sign only) I found this Superuser ...
5
votes
2answers
584 views

Should DSA keys be considered deprecated?

The gist of openssh deprecates dss-keys appears to be: "In light of recently discovered vulnerabilities openssh deprecates DSA keys." Does this mean I should generally consider DSA keys ...
11
votes
1answer
1k views

Why OpenSSH deprecated DSA keys

There was a question RSA vs. DSA for SSH authentication keys asking which key is better. Basically all answers were more in a favour of RSA over DSA but didn't really tell that DSA would be somehow ...
3
votes
1answer
54 views

Is it possible to have an RSA authentication subkey with a DSA master key?

My key setup is as follows: sec dsa3072/CA72E53A created: 2013-05-12 expires: never usage: SCA trust: ultimate validity: ultimate The following key was revoked on 2016-01-13 ...
3
votes
2answers
235 views

Was DSA invented from RSA?

I'm wondering if the two algorithms are similar and whether DSA was really just based off RSA? Is DSA based on RSA and public key encryption? If so how does DSA introduce signing and makes it ...
2
votes
0answers
56 views

Why is DSA is faster than RSA for signature generation but slower for validation?

Almost on every post comparing DSA and RSA, I see a point brought up: DSA is faster for signature generation, but slower for validation. I wonder why this is? For example, in DSA, to sign something, ...
0
votes
0answers
46 views

Generation of the primes p,q and g for DSA using an Hash Function in OpenSSL

We can generate primes p,q and g for DSA in OpenSSL by using command: openssl dsaparam -text -out dsaparam.pem 1024 Is it possible to generate primes p , q and g using an Hash Function in OpenSSL ...
2
votes
1answer
157 views

GPG: Can't encrypt DSA 3072 keys

I would like to ask this question as I'm not the first person which has this behavior. I'm trying to encrypt a simple message using GnuPG using a public key I've received from a friend, he's using ...
1
vote
2answers
168 views

Any way to revoke old key pair?

There is a many-year-old 1024 DSA key in the public keyservers under my name. There is a 2048 ELG-E subkey for it. I didn't create these keys, they were created for me by a former employer without my ...
0
votes
0answers
192 views

DSA, ECDSA and RSA [duplicate]

Conventional wisdom these days is that in the context of SSH keys, DSA is insecure and RSA is preferred (or that they are both fine, but RSA is more secure, depending on who you ask). As I understand ...
1
vote
2answers
181 views

Significance of the difference between DSA and RSA in signature verifying speed

I have run openssl speed and the output on my CPU for longest available DSA key size, which is 2048 bits: sign verify sign/s verify/s rsa 2048 bits 0.029185s ...
3
votes
1answer
400 views

Are DSA keys breakable?

Are the DSA keys breakable? If so, what is the maximum key size that is breakable with the latest technology ? Why are DSA keys not used during authentication? Can we use DSA keys for encryption?
4
votes
1answer
3k views

openssl ECDHE-RSA… cipher suite selected while using RSA server cert and ECDSA client cert

The scene: s_server using RSA certificate. s_client using ECC-ECDSA certificate. Client authentication is required (option -Verify set on s_server) Cipher-suite selected after handshake is ...
0
votes
1answer
174 views

RSA vs DSA Digital Signature Message Digest Recovery

I'm learning about signatures using RSA and DSA, I've come across this little fact: RSA can recover the message digest from the signature, whereas in DSA this isn’t possible – you have to have the ...
0
votes
1answer
259 views

RSA vs DSA working methodolgy?

I have looked for various answers but I am being confused on how does RSA can be used for both Digital Signatures and Encryption/Decryption like in "TLS_DHE_RSA_..." or "TLS_RSA_.." cipher suite ...
1
vote
1answer
537 views

DSA Generates different signatures with the same data [closed]

I'm using the example given in msdn article about the DSACryptoServiceProvider Class. The problem is that I get a different signature each time I run the code. I tried OpenSSL and didn't get this ...
1
vote
1answer
403 views

Rest WebService with signed requests in Java

I'm currently implementing a rest web service with Spring+Java+Tomcat and a cmd client to access it. The most important requirement is to restrict the usage to authenticated users - encryption isn't ...
0
votes
2answers
172 views

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". ...
3
votes
2answers
2k views

Are RSA 2048, ECDSA, and the SHA uncrackable in the sense that AES-256 is uncrackable?

The answer http://security.stackexchange.com/a/25392 has seemingly shown that AES-256 will not be directly cracked for at least the next 200 years (unless we manage to harvest the energy output of ...
5
votes
2answers
15k views

Why are DSA keys referred to as DSS keys when used with SSH?

When I generate a DSA key with ssh-keygen -t dsa, the resulting public key will begin with ssh-dss. How come? Why not ssh-dsa?
1
vote
2answers
727 views

why are the first few characters of a DSA Private Key similar?

I noticed most DSA private keys often start with the same few characters, MIIBvAIBAAKBgQD . For example, generate a private key on Ubuntu, by running: ssh-keygen -t dsa -N '' -f /tmp/id_dsa This ...
1
vote
1answer
165 views

Using secp256k1 and ECDSA with IKE

I just tried using an IKE daemon and EC certificates. I used the secp256k1 curve for key generation. The daemon claims signature scheme ECDSA-256 not supported by private key Now I am wondering ...
0
votes
1answer
256 views

Does DSA need padding?

So i read on wikipedia that digital signatures need padding (like PSS) and i know this is true for RSA. But know i ask myself does DSA also need padding?
2
votes
1answer
277 views

Is the `ssh-agent`'s DSA signature deterministic?

In my hopes to use ssh-agent to generate a signature as password I implicitly assumed a deterministic signature. DSA is however supposed to take random value k for signing. However that randomness is ...