To conduct data mining, we often need to collect data from various data owners. Privacy concerns may prevent the parties from directly sharing the data and some types of information about the data. To conduct data mining with- out compromising data privacy, we propose a verification scheme to ensure that the collected data follow the require- ments of data miners, which is one of the important issues in privacy-preserving data mining systems. Key Words: Data Collection, Data Mining, Verification, Cryptography.