What is the default encryption type of the ssh-keygen?

Question

When generating private/public keys with ssh-keygen what types of keys will it generate if I wont pass -t option followed with the encryption type like rsa?

Answer 1

From the man page:

ssh-keygen can create RSA keys for use by SSH protocol version 1 and DSA, ECDSA or RSA keys for use by SSH protocol version 2. The type of key to be generated is specified with the -t option. If invoked without any arguments, ssh-keygen will generate an RSA key for use in SSH protocol 2 connections.

So that's RSA by default. Note that ssh-keygen prints out what type of key it is generating in its first line of output.