Checking files with .sign keys

Question: how to verify file with .sign key (for example updates downloaded from dell sites)

- first you have to generate your own certificate with gpg: gpg --gen-key

- download file and its .sign key (ex: file and sign)

- download public key (ex: http://lists.us.dell.com/linux-security-publickey.txt)

- import public key gpg --import linux-security-publickey.txt

- sign public key: gpg --edit-key linux-security@dell.com then fpr (for check fingerprint) and (sign for signature check)

- check file with gpg command:

 gpg --verify PER210_BMC_FRMW_LX_R278576.BIN.sign PER210_BMC_FRMW_LX_R278576.BIN

Result in Polish:

gpg: Podpisano w pon, 16 sie 2010, 13:41:21 CEST kluczem DSA o numerze 23B66A9D

gpg: Poprawny podpis złożony przez ,,Dell, Inc. (Product Group) ''