sun/security/mscapi/SignatureOffsets.java fails intermittently with Keyset does not exist:

----------System.out:(6/212)----------
Seed from RandomFactory = 7500011171361296193L
Running test with offset 33
Successfully verified with offset 33
Running test with offset 50
Successfully verified with offset 50
Running test with offset 100
----------System.err:(20/1085)----------
java.security.SignatureException: Keyset does not exist

at sun.security.mscapi.RSASignature.verifySignedHash(Native Method)
at sun.security.mscapi.RSASignature.engineVerify(RSASignature.java:443)
at java.security.SignatureSpi.engineVerify(SignatureSpi.java:278)
at java.security.Signature$Delegate.engineVerify(Signature.java:1233)
at java.security.Signature.verify(Signature.java:705)
at Offsets.verifySignature(Offsets.java:91)
at Offsets.main(Offsets.java:145)
at SignatureOffsets.main(SignatureOffsets.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:504)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:218)
at java.lang.Thread.run(Thread.java:746)

JavaTest Message: Test threw exception: java.security.SignatureException
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.security.SignatureException: Keyset does not exist