ssh-keygen -t rsa | ssh-keygen -t dsa | Digital Signature Algorithm | Ed25519

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today, you are better of with an RSA 2048 bit key

 DSA (Digital Signature Algorithm)
DSA is a variant on the ElGamal and Schnorr algorithms creates a 320 bit signature, but with 512-1024 bit security security again rests on difficulty of computing discrete logarithms has been quite widely accepted 
  • DSA uses Discrete logarithm.
  • RSA uses Integer Factorization.

RSA stands for Ron Rivest, Adi Shamir and Leonard Adleman.

 [root@localhost ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): ^C

[root@localhost ~]# ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa): ^C
[root@localhost ~]#

The bottom line is:
  • Never use DSA or ECDSA.
  • Ed25519 is probably the strongest mathematically (and also the fastest), but not yet widely supported. As a bonus, it has stronger encryption (password-protection) of the private key by default than other key types.
  • RSA is the best bet if you can't use Ed25519.

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