To ensure security of the imported data, all data you import using Data Import will automatically be hashed. This means that we change the original values to a numeric value (hash), it's not possible to turn this hash back into its original string. This makes importing the data into the DMP much safer.
Hashing and encrypting data is not the same. The biggest advantage of hashing data over encrypting data is that it's not possible to turn the hash into its original string. With encrypting it is possible to reverse the data back into its original decrypted form if you have the right key.