diff --git a/pir/pom.xml b/pir/pom.xml
index 7a73e86..4fdae28 100644
--- a/pir/pom.xml
+++ b/pir/pom.xml
@@ -7,6 +7,18 @@
     <groupId>dk.au.pir</groupId>
     <artifactId>pir</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 
     <dependencies>
         <dependency>
diff --git a/pir/src/main/java/dk/alexandra/fresco/framework/builder/numeric/field/BigIntegerFieldElement.java b/pir/src/main/java/dk/alexandra/fresco/framework/builder/numeric/field/BigIntegerFieldElement.java
new file mode 100644
index 0000000..93b774e
--- /dev/null
+++ b/pir/src/main/java/dk/alexandra/fresco/framework/builder/numeric/field/BigIntegerFieldElement.java
@@ -0,0 +1,86 @@
+package dk.alexandra.fresco.framework.builder.numeric.field;
+
+import dk.alexandra.fresco.framework.util.MathUtils;
+import java.math.BigInteger;
+
+/**
+ * An element in a field defined by a {@link BigIntegerModulus}.
+ */
+final public class BigIntegerFieldElement implements FieldElement {
+
+    private static final long serialVersionUID = -6786266947587799652L;
+
+    private final BigInteger value;
+
+    private final BigIntegerModulus modulus;
+    private BigIntegerFieldElement(BigInteger value, BigIntegerModulus modulus) {
+        this.value = modulus.reduceModThis(value);
+        this.modulus = modulus;
+    }
+
+    private FieldElement create(BigInteger value) {
+        return create(value, this.modulus);
+    }
+
+    static FieldElement create(BigInteger value, BigIntegerModulus modulus) {
+        return new BigIntegerFieldElement(value, modulus);
+    }
+
+    static FieldElement create(long value, BigIntegerModulus modulus) {
+        return create(BigInteger.valueOf(value), modulus);
+    }
+
+    static FieldElement create(String string, BigIntegerModulus modulus) {
+        return create(new BigInteger(string), modulus);
+    }
+
+    @Override
+    public FieldElement add(FieldElement operand) {
+        return create(value.add(extractValue(operand)));
+    }
+
+    @Override
+    public FieldElement subtract(FieldElement operand) {
+        return create(value.subtract(extractValue(operand)));
+    }
+
+    @Override
+    public FieldElement negate() {
+        return create(getModulus().subtract(value));
+    }
+
+    @Override
+    public FieldElement multiply(FieldElement operand) {
+        return create(value.multiply(extractValue(operand)));
+    }
+
+    @Override
+    public FieldElement sqrt() {
+        return create(MathUtils.modularSqrt(value, getModulus()));
+    }
+
+    @Override
+    public FieldElement modInverse() {
+        return create(value.modInverse(getModulus()));
+    }
+
+    static BigInteger extractValue(FieldElement element) {
+        return ((BigIntegerFieldElement) element).value;
+    }
+
+    public BigInteger getValue() {
+        return value;
+    }
+
+    private BigInteger getModulus() {
+        return modulus.getBigInteger();
+    }
+
+    @Override
+    public String toString() {
+        return "BigIntegerFieldElement{"
+                + "value=" + value
+                + ", modulus=" + modulus
+                + '}';
+    }
+}
diff --git a/pir/src/main/java/dk/au/pir/Driver.java b/pir/src/main/java/dk/au/pir/Driver.java
new file mode 100644
index 0000000..2d8f3f1
--- /dev/null
+++ b/pir/src/main/java/dk/au/pir/Driver.java
@@ -0,0 +1,13 @@
+package dk.au.pir;
+
+import dk.alexandra.fresco.framework.builder.numeric.field.FieldElement;
+import dk.au.pir.protocols.interpoly.InterPolyClient;
+
+public class Driver {
+    public static void main(String[] args) {
+        InterPolyClient client = new InterPolyClient();
+        for (FieldElement elem: client.getSRandomFieldElements()) {
+            System.out.println(elem);
+        }
+    }
+}
diff --git a/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyClient.java b/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyClient.java
index 01b6459..e1febd3 100644
--- a/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyClient.java
+++ b/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyClient.java
@@ -1,10 +1,35 @@
 package dk.au.pir.protocols.interpoly;
 
+import dk.alexandra.fresco.framework.builder.numeric.field.BigIntegerFieldElement;
+import dk.alexandra.fresco.framework.builder.numeric.field.FieldElement;
 import dk.au.pir.settings.PIRSettings;
 
+import java.math.BigInteger;
+import java.util.Random;
+
 public class InterPolyClient {
-    public static void main(String[] args) {
-        System.out.println("Client!");
-        System.out.println(PIRSettings.FIELD_DEFINITION.getBitLength());
+    private final int i;
+    private Random random = new Random();
+    private BigIntegerFieldElement[] fieldElements = new BigIntegerFieldElement[PIRSettings.MOD_BIT_LENGTH];
+
+    public InterPolyClient(int i) {
+        this.i = i;
+    }
+
+    public void generateSRandomFieldElements() {
+        for (int i = 0; i < fieldElements.length; i++) {
+            this.fieldElements[i] = (BigIntegerFieldElement) PIRSettings.FIELD_DEFINITION.createElement(new BigInteger(PIRSettings.MAX_BIT_LENGTH, random));
+        }
+    }
+
+    public FieldElement g(int l, BigIntegerFieldElement z) {
+        String iString = Integer.toBinaryString(i);
+        char lChar = iString.charAt(iString.length() - 1 - l);  // lol
+        BigIntegerFieldElement il = (BigIntegerFieldElement) PIRSettings.FIELD_DEFINITION.createElement(Character.toString(lChar));
+        return fieldElements[l].multiply(z).add(il);
+    }
+
+    public FieldElement[] getFieldElements() {
+        return fieldElements;
     }
 }
diff --git a/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyServer.java b/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyServer.java
index cfa3018..fa2efa2 100644
--- a/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyServer.java
+++ b/pir/src/main/java/dk/au/pir/protocols/interpoly/InterPolyServer.java
@@ -1,4 +1,5 @@
 package dk.au.pir.protocols.interpoly;
 
 public class InterPolyServer {
+
 }
diff --git a/pir/src/main/java/dk/au/pir/settings/PIRSettings.java b/pir/src/main/java/dk/au/pir/settings/PIRSettings.java
index ebd7738..a0c3b79 100644
--- a/pir/src/main/java/dk/au/pir/settings/PIRSettings.java
+++ b/pir/src/main/java/dk/au/pir/settings/PIRSettings.java
@@ -4,7 +4,12 @@ import dk.alexandra.fresco.framework.builder.numeric.field.BigIntegerFieldDefini
 import dk.alexandra.fresco.framework.builder.numeric.field.FieldDefinition;
 import dk.alexandra.fresco.framework.util.ModulusFinder;
 
+import java.math.BigInteger;
+
 public class PIRSettings {
-    private static final int MOD_BIT_LENGTH = 16;
-    public static FieldDefinition FIELD_DEFINITION =  new BigIntegerFieldDefinition(ModulusFinder.findSuitableModulus(MOD_BIT_LENGTH));
+    public static final int MOD_BIT_LENGTH = 16;  // s
+    public static final int DATABASE_SIZE = (int) Math.pow(2, MOD_BIT_LENGTH);  // n
+    public static final int MAX_BIT_LENGTH = 512;
+
+    public static FieldDefinition FIELD_DEFINITION = new BigIntegerFieldDefinition(ModulusFinder.findSuitableModulus(MOD_BIT_LENGTH));
 }
diff --git a/pir/src/main/java/dk/au/pir/utils/ProtocolUtils.java b/pir/src/main/java/dk/au/pir/utils/ProtocolUtils.java
new file mode 100644
index 0000000..abb5462
--- /dev/null
+++ b/pir/src/main/java/dk/au/pir/utils/ProtocolUtils.java
@@ -0,0 +1,10 @@
+package dk.au.pir.utils;
+
+public class ProtocolUtils {
+    public static int kronecker(int i, int j) {
+        if (i == j) {
+            return 1;
+        }
+        return 0;
+    }
+}