[packman] error with rpm installation in Suse(SLE11 i586)

[Елена Матвеева]

Dear sirs!

I'm new in Linux and I'd be very gratefull for your help.

When I'm trying to install in SLE11 i586  one of the rpms from the packman's site, for example let's take this one: liba52-0-0.7.5svn-3.pm.7.1.i586.rpm, I get the message:
"Subprocess failed. Error: Сбой RPM: error: /var/cache/zypp/packages/Хранилище/rpm/liba52-0-0.7.5svn-3.pm.7.1.i586.rpm: Header V4 RSA/SHA1 signature: BAD, key ID 1abd1afb
error: /var/cache/zypp/packages/Хранилище/rpm/liba52-0-0.7.5svn-3.pm.7.1.i586.rpm cannot be installed",
though the rpm seems to be the right one. I wonder where the mistake is.
Hoping to get an advice, I enclose the rpm below .

Thank you in advance.