diff --git a/src/tasks/mod.rs b/src/tasks/mod.rs
index 0613d93..2c3a428 100644
--- a/src/tasks/mod.rs
+++ b/src/tasks/mod.rs
@@ -9,8 +9,8 @@ use tasks01::{
     gfmul::gfmul_task,
     pad_oracle::padding_oracle,
     pfmath::{
-        gfdiv, gfpoly_add, gfpoly_diff, gfpoly_divmod, gfpoly_gcd, gfpoly_make_monic, gfpoly_mul,
-        gfpoly_pow, gfpoly_powmod, gfpoly_sort, gfpoly_sqrt,
+        gfdiv, gfpoly_add, gfpoly_diff, gfpoly_divmod, gfpoly_factor_sff, gfpoly_gcd,
+        gfpoly_make_monic, gfpoly_mul, gfpoly_pow, gfpoly_powmod, gfpoly_sort, gfpoly_sqrt,
     },
     poly2block::poly2block,
     sea128::sea128,
@@ -157,6 +157,12 @@ pub fn task_deploy(testcase: &Testcase) -> Result<Value> {
 
             Ok(json)
         }
+        "gfpoly_factor_sff" => {
+            let result = gfpoly_factor_sff(args)?;
+            let json = json!({"factors" : result});
+
+            Ok(json)
+        }
 
         _ => Err(anyhow!(
             "Fatal. No compatible action found. Json data was {:?}. Arguments were; {:?}",
diff --git a/src/tasks/tasks01/pfmath.rs b/src/tasks/tasks01/pfmath.rs
index 182e17d..b9067cc 100644
--- a/src/tasks/tasks01/pfmath.rs
+++ b/src/tasks/tasks01/pfmath.rs
@@ -5,6 +5,7 @@ use serde_json::Value;
 use crate::utils::{
     field::FieldElement,
     poly::{gcd, Polynomial},
+    sff::{sff, Factors},
 };
 
 pub fn gfpoly_add(args: &Value) -> Result<Polynomial> {
@@ -117,6 +118,23 @@ pub fn gfpoly_gcd(args: &Value) -> Result<Polynomial> {
     Ok(result)
 }
 
+pub fn gfpoly_factor_sff(arsg: &Value) -> Result<Vec<(Factors)>> {
+    let poly_f = Polynomial::from_c_array(&arsg["F"].clone());
+
+    let mut factors = sff(poly_f);
+    factors.sort();
+    let mut result: Vec<Factors> = vec![];
+
+    for (factor, exponent) in factors {
+        result.push(Factors {
+            factor: factor.to_c_array(),
+            exponent,
+        });
+    }
+
+    Ok(result)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/utils/dff.rs b/src/utils/dff.rs
index e69de29..575d9de 100644
--- a/src/utils/dff.rs
+++ b/src/utils/dff.rs
@@ -0,0 +1,10 @@
+use super::poly::Polynomial;
+
+pub fn dff(f: Polynomial) {
+    let q = 2u128.pow(128);
+    let z: Vec<(Polynomial, u32)> = vec![];
+    let d = 1;
+    let f_start = f.clone();
+
+    while f_start.degree() >= 2 * d {}
+}
diff --git a/src/utils/poly.rs b/src/utils/poly.rs
index b4a1060..786c67a 100644
--- a/src/utils/poly.rs
+++ b/src/utils/poly.rs
@@ -22,6 +22,10 @@ impl Polynomial {
         Self { polynomial }
     }
 
+    pub fn degree(&self) -> usize {
+        self.polynomial.len()
+    }
+
     pub fn from_c_array(array: &Value) -> Self {
         let mut polynomial: Vec<FieldElement> = vec![];
         let c_array: Vec<String> = array
diff --git a/src/utils/sff.rs b/src/utils/sff.rs
index f2478b5..f8f1358 100644
--- a/src/utils/sff.rs
+++ b/src/utils/sff.rs
@@ -8,9 +8,9 @@ use crate::utils::{
 use super::poly::Polynomial;
 
 #[derive(Debug, Serialize, Deserialize)]
-struct Factors {
-    factor: Vec<String>,
-    exponent: u32,
+pub struct Factors {
+    pub factor: Vec<String>,
+    pub exponent: u32,
 }
 
 pub fn sff(mut f: Polynomial) -> Vec<(Polynomial, u32)> {
diff --git a/test_json/sandbox.json b/test_json/sandbox.json
index 48d59ed..007d487 100644
--- a/test_json/sandbox.json
+++ b/test_json/sandbox.json
@@ -1,26 +1,26 @@
 {
   "testcases": {
     "sandbox": {
-      "action": "gfpoly_gcd",
+      "action": "gfpoly_factor_sff",
       "arguments": {
-        "A": [
-          "DNWpXnnY24XecPa7a8vrEA==",
-          "I8uYpCbsiPaVvUznuv1IcA==",
-          "wsbiU432ARWuO93He3vbvA==",
-          "zp0g3o8iNz7Y+8oUxw1vJw==",
-          "J0GekE3uendpN6WUAuJ4AA==",
-          "wACd0e6u1ii4AAAAAAAAAA==",
-          "ACAAAAAAAAAAAAAAAAAAAA=="
-        ],
-        "B": [
-          "I20VjJmlSnRSe88gaDiLRQ==",
-          "0Cw5HxJm/pfybJoQDf7/4w==",
-          "8ByrMMf+vVj5r3YXUNCJ1g==",
-          "rEU/f2UZRXqmZ6V7EPKfBA==",
-          "LfdALhvCrdhhGZWl9l9DSg==",
-          "KSUKhN0n6/DZmHPozd1prw==",
-          "DQrRkuA9Zx279wAAAAAAAA==",
-          "AhCEAAAAAAAAAAAAAAAAAA=="
+        "F": [
+          "vL77UwAAAAAAAAAAAAAAAA==",
+          "mEHchYAAAAAAAAAAAAAAAA==",
+          "9WJa0MAAAAAAAAAAAAAAAA==",
+          "akHfwWAAAAAAAAAAAAAAAA==",
+          "E12o/QAAAAAAAAAAAAAAAA==",
+          "vKJ/FgAAAAAAAAAAAAAAAA==",
+          "yctWwAAAAAAAAAAAAAAAAA==",
+          "c1BXYAAAAAAAAAAAAAAAAA==",
+          "o0AtAAAAAAAAAAAAAAAAAA==",
+          "AbP2AAAAAAAAAAAAAAAAAA==",
+          "k2YAAAAAAAAAAAAAAAAAAA==",
+          "vBYAAAAAAAAAAAAAAAAAAA==",
+          "dSAAAAAAAAAAAAAAAAAAAA==",
+          "69gAAAAAAAAAAAAAAAAAAA==",
+          "VkAAAAAAAAAAAAAAAAAAAA==",
+          "a4AAAAAAAAAAAAAAAAAAAA==",
+          "gAAAAAAAAAAAAAAAAAAAAA=="
         ]
       }
     }