iso, asc e md5

Galera,

    Baixei o cl10-rc1, mais os arquivos .asc e md5, como funcionam esses
arquivos ? dei uma googada e não consegui fazer funcionar, fiz o seguinte:

 gpg --verify cl10_rc1-1.iso.asc cl10_rc1-1.iso # dá o erro
 gpg: Signature made Thu 22 Apr 2004 06:16:27 PM BRT using DSA key ID
99807190
 gpg: Can't check signature: public key not found

./MD5SUM cl10_rc1-1.iso.md5 cl10_rc1-1.iso # dá o erro

./MD5SUM: -----BEGIN: command not found
./MD5SUM: Hash:: command not found
./MD5SUM: 34048ce4cd069b624f6e021ba63ecde5: command not found
./MD5SUM: 6b8ba42f56b397d536826c78c9679c0a: command not found
./MD5SUM: af38ac4316ba20df2dec5f990913396d: command not found
./MD5SUM: 0727c51ab359dafa9ab31e0c50958aa6: command not found
./MD5SUM: 2ddd8e6a8502869cd2e78d47590b9be1: command not found
./MD5SUM: f378cf68b22c3b9a64c86b5067511630: command not found
./MD5SUM: -----BEGIN: command not found
./MD5SUM: line 11: syntax error near unexpected token `(G'
./MD5SUM: line 11: `Version: GnuPG v1.0.7 (GNU/Linux)

P.S. NÃO POSSO SIMPLESMENTE GRAVAR AS IMAGENS ISO PARA OS CD´S ??? SEMPRE
FAÇO ISSO NO RED HAT E FUNCIONA.

ROBSON