Which repository are you referring to? An internal NiFi repository or the location your flow is writing data to?   You can use the EncryptContent processor to encrypt the whole content of the flowfile, but there isn't an easy way to a single field of a record. To do this you will have to use something like the ScriptedTransformRecord and provide a script that encrypts parts of your data.   Here's an example of using ScriptedTransformRecord with a Groovy script to encrypt the field "name": import javax.crypto.Cipher import javax.crypto.SecretKey import javax.crypto.SecretKeyFactory import javax.crypto.spec.IvParameterSpec import javax.crypto.spec.PBEKeySpec import javax.crypto.spec.SecretKeySpec import java.security.Key import java.security.spec.KeySpec String encryptionKey = "#{encryption.key}" Key aesKey = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES") Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding") cipher.init(Cipher.ENCRYPT_MODE, aesKey) record.setValue("name", cipher.doFinal(record.getValue("name").getBytes("UTF-8")).encodeBase64()) record  To decrypt it you could use: import javax.crypto.Cipher import javax.crypto.SecretKey import javax.crypto.SecretKeyFactory import javax.crypto.spec.IvParameterSpec import javax.crypto.spec.PBEKeySpec import javax.crypto.spec.SecretKeySpec import java.security.Key import java.security.spec.KeySpec import java.util.Base64 String encryptionKey = "#{encryption.key}" Key aesKey = new SecretKeySpec(encryptionKey.getBytes("UTF-8"), "AES") Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding") cipher.init(Cipher.DECRYPT_MODE, aesKey) record.setValue("name", cipher.doFinal(Base64.getDecoder().decode(record.getValue("name")))) record   The encrypt key is specified through a NiFi parameter called encryption.key.   Cheers, André ... View more