SSH生成密钥是需要什么信息?

ssh-keygen的手册页:

ssh-keygen generates, manages and converts authentication keys for

ssh(1).  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 with-

out any arguments, ssh-keygen will generate an RSA key for use in SSH

protocol 2 connections.

-t type

      Specifies the type of key to create.  The possible values are

      'rsa1' for protocol version 1 and 'dsa', 'ecdsa' or 'rsa'

      for protocol version 2.

-f filename

      Specifies the filename of the key file.

-N new_passphrase

      Provides the new passphrase.

-b bits

      Specifies the number of bits in the key to create.  For RSA keys,

      the minimum size is 768 bits and the default is 2048 bits.  Gen-

      erally, 2048 bits is considered sufficient.  DSA keys must be ex-

      actly 1024 bits as specified by FIPS 186-2.  For ECDSA keys, the

      -b flag determines they key length by selecting from one of three

      elliptic curve sizes: 256, 384 or 521 bits.  Attempting to use

      bit lengths other than these three values for ECDSA keys will

      fail.