Rsa Problem

When I running my Rsa program to testing the time. It has a exception that: Data must not be longer than 117 bytes. My encrypted thing is a object contains 4 string information. There is no restraction of RSA about data in document. Anybody know what's the problem?

Thanks very much.

KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");

keyGen.initialize(1024);

KeyPair pair = keyGen.generateKeyPair();

long startTime = TimeCounter.startTime();

Rsa rsa =new Rsa(pair);

rsa.encypt(si);

SecretInformation decrypted = rsa.decypt();

System.out.println(TimeCounter.period(startTime));

[744 byte] By [easona] at [2007-10-3 3:05:41]