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software installation considerably smaller, they must be
used correctly in order to benefit from increased security.
The existence of a certificate does not offer any protection
by itself, the certificate manager must contain correct,
authentic, or trusted certificates for increased security to
be available. Certificates have a restricted lifetime. If
“Expired certificate” or “Certificate not valid yet” is shown
even if the certificate should be valid, check that the
current date and time in your smartphone are correct.
Before changing any certificate settings, you must make
sure that you really trust the owner of the certificate and
that the certificate really belongs to the listed owner.
Fig. 31: Certificate manager
To view certificate details, double-tap a certificate.
To delete a certificate, tap Delete.
To define the usage of the certificate, double-tap a
certificate and tap Trust settings. Define the following:
SIS installation: — Select this check box, if you want this
certificate to be able to certify the origin of a new SIS
software.
Application installation: - Select this check box, if you want
this certificate to be able to certify the origin of a new
java software.
Web and e-mail: — Select this check box, if you want this
certificate to be able to certify web sites and mail-
servers.
Checking the authenticity of a
certificate
1 Select the certificate and tap Details. A view of
certificate details opens.
2 The Issued to: field identifies the owner of this
certificate. Make sure that this is the name of the
party to whom you think that this certificate belongs.
3 Scroll the dialog until you see the Fingerprint: field,
which uniquely identifies the certificate. Contact the
help desk or customer service of the owner of the
certificate (see step 2 above) and ask for the MD5
fingerprint of the certificate. Compare the fingerprint
with the one shown in the dialog. If they match, the
certificate should be authentic.
Use this authentication procedure each time you add a
new certificate.