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* What preffered client?

GNU gpg.

* How import keys from key-server?

  $  gpg --keyserver pgp.mit.edu --recv-keys 0x353E25BC

* How create own PGP key?

  $ gpg --gen-key   # answer the question
...
  $ gpg -o $keyfile --export-secret-keys $NAME

* How import keys from file?

  $ gpg --import $keyfile

* How submit public key to key server?

  $ gpg --keyserver pgp.mit.edu --send-key ${key_ID}

* How keys in local db.

  $ gpg -list-keys ${user_ID}

* How sign file?

To sign with first key

  $ gpg -o $file.sig --sign $file
  $ gpg --default-key $NAME -o $file.sig --sign $file
  $ gpg -u ${USER_NAME} -o $file.sig --sign $file

* How verify signature?

  $ gpg --verify $file.sig