diff --git a/src/core/air/air_ext.rs b/src/core/air/air_ext.rs
index 574b5b742..2817df889 100644
--- a/src/core/air/air_ext.rs
+++ b/src/core/air/air_ext.rs
@@ -3,15 +3,14 @@ use std::iter::zip;
 
 use itertools::Itertools;
 
-use super::evaluation::{
-    DomainEvaluationAccumulator, PointEvaluationAccumulator, SECURE_EXTENSION_DEGREE,
-};
+use super::evaluation::{DomainEvaluationAccumulator, PointEvaluationAccumulator};
 use super::{Air, ComponentTrace};
 use crate::core::backend::CPUBackend;
 use crate::core::circle::CirclePoint;
 use crate::core::fields::qm31::SecureField;
+use crate::core::fields::secure::{SecureCirclePoly, SECURE_EXTENSION_DEGREE};
 use crate::core::fri::CirclePolyDegreeBound;
-use crate::core::poly::circle::{CanonicCoset, CirclePoly, SecureCirclePoly};
+use crate::core::poly::circle::{CanonicCoset, CirclePoly};
 use crate::core::prover::LOG_BLOWUP_FACTOR;
 use crate::core::ComponentVec;
 
diff --git a/src/core/air/evaluation.rs b/src/core/air/evaluation.rs
index cca111d2e..e89c6df11 100644
--- a/src/core/air/evaluation.rs
+++ b/src/core/air/evaluation.rs
@@ -3,50 +3,13 @@
 //! Given a random alpha, the combined polynomial is defined as
 //!   f(p) = sum_i alpha^{N-1-i} u_i (P).
 use crate::core::backend::cpu::CPUCircleEvaluation;
-use crate::core::backend::{Backend, CPUBackend, Col, Column};
+use crate::core::backend::{Backend, CPUBackend};
 use crate::core::fields::m31::BaseField;
 use crate::core::fields::qm31::SecureField;
-use crate::core::fields::{ExtensionOf, FieldExpOps};
-use crate::core::poly::circle::{CanonicCoset, CirclePoly, SecureCirclePoly};
+use crate::core::fields::secure::{SecureCirclePoly, SecureColumn};
+use crate::core::fields::FieldExpOps;
+use crate::core::poly::circle::{CanonicCoset, CirclePoly};
 use crate::core::poly::BitReversedOrder;
-use crate::core::utils::IteratorMutExt;
-
-pub const SECURE_EXTENSION_DEGREE: usize =
-    <SecureField as ExtensionOf<BaseField>>::EXTENSION_DEGREE;
-
-// TODO(spapini): find a better place for this
-pub struct SecureColumn<B: Backend> {
-    pub cols: [Col<B, BaseField>; SECURE_EXTENSION_DEGREE],
-}
-
-impl SecureColumn<CPUBackend> {
-    fn at(&self, index: usize) -> SecureField {
-        SecureField::from_m31_array(std::array::from_fn(|i| self.cols[i][index]))
-    }
-
-    fn set(&mut self, index: usize, value: SecureField) {
-        self.cols
-            .iter_mut()
-            .map(|c| &mut c[index])
-            .assign(value.to_m31_array());
-    }
-}
-
-impl<B: Backend> SecureColumn<B> {
-    pub fn zeros(len: usize) -> Self {
-        Self {
-            cols: std::array::from_fn(|_| Col::<B, BaseField>::zeros(len)),
-        }
-    }
-
-    pub fn len(&self) -> usize {
-        self.cols[0].len()
-    }
-
-    pub fn is_empty(&self) -> bool {
-        self.cols[0].is_empty()
-    }
-}
 
 /// Accumulates evaluations of u_i(P0) at a single point.
 /// Computes f(P0), the combined polynomial at that point.
diff --git a/src/core/fields/mod.rs b/src/core/fields/mod.rs
index 72693b5fa..e804100c8 100644
--- a/src/core/fields/mod.rs
+++ b/src/core/fields/mod.rs
@@ -9,6 +9,7 @@ use super::backend::ColumnOps;
 pub mod cm31;
 pub mod m31;
 pub mod qm31;
+pub mod secure;
 
 pub trait FieldOps<F: Field>: ColumnOps<F> {
     // TODO(Ohad): change to use a mutable slice.
diff --git a/src/core/poly/circle/secure_poly.rs b/src/core/fields/secure.rs
similarity index 52%
rename from src/core/poly/circle/secure_poly.rs
rename to src/core/fields/secure.rs
index 986c648bd..f557952e7 100644
--- a/src/core/poly/circle/secure_poly.rs
+++ b/src/core/fields/secure.rs
@@ -1,12 +1,48 @@
 use std::ops::Deref;
 
-use crate::core::air::evaluation::SECURE_EXTENSION_DEGREE;
+use super::m31::BaseField;
+use super::qm31::SecureField;
+use super::ExtensionOf;
 use crate::core::backend::cpu::CPUCirclePoly;
+use crate::core::backend::{Backend, CPUBackend, Col, Column};
 use crate::core::circle::CirclePoint;
-use crate::core::fields::qm31::SecureField;
+use crate::core::utils::IteratorMutExt;
 
-pub struct SecureCirclePoly(pub [CPUCirclePoly; SECURE_EXTENSION_DEGREE]);
+pub const SECURE_EXTENSION_DEGREE: usize =
+    <SecureField as ExtensionOf<BaseField>>::EXTENSION_DEGREE;
+
+pub struct SecureColumn<B: Backend> {
+    pub cols: [Col<B, BaseField>; SECURE_EXTENSION_DEGREE],
+}
+impl SecureColumn<CPUBackend> {
+    pub fn at(&self, index: usize) -> SecureField {
+        SecureField::from_m31_array(std::array::from_fn(|i| self.cols[i][index]))
+    }
+
+    pub fn set(&mut self, index: usize, value: SecureField) {
+        self.cols
+            .iter_mut()
+            .map(|c| &mut c[index])
+            .assign(value.to_m31_array());
+    }
+}
+impl<B: Backend> SecureColumn<B> {
+    pub fn zeros(len: usize) -> Self {
+        Self {
+            cols: std::array::from_fn(|_| Col::<B, BaseField>::zeros(len)),
+        }
+    }
 
+    pub fn len(&self) -> usize {
+        self.cols[0].len()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.cols[0].is_empty()
+    }
+}
+
+pub struct SecureCirclePoly(pub [CPUCirclePoly; SECURE_EXTENSION_DEGREE]);
 impl SecureCirclePoly {
     pub fn eval_at_point(&self, point: CirclePoint<SecureField>) -> SecureField {
         combine_secure_value(self.eval_columns_at_point(point))
@@ -24,7 +60,6 @@ impl SecureCirclePoly {
         ]
     }
 }
-
 impl Deref for SecureCirclePoly {
     type Target = [CPUCirclePoly; SECURE_EXTENSION_DEGREE];
 
diff --git a/src/core/poly/circle/mod.rs b/src/core/poly/circle/mod.rs
index 639696bae..d2b97c082 100644
--- a/src/core/poly/circle/mod.rs
+++ b/src/core/poly/circle/mod.rs
@@ -3,14 +3,12 @@ mod domain;
 mod evaluation;
 mod ops;
 mod poly;
-mod secure_poly;
 
 pub use canonic::CanonicCoset;
 pub use domain::CircleDomain;
 pub use evaluation::{CircleEvaluation, CosetSubEvaluation};
 pub use ops::PolyOps;
 pub use poly::CirclePoly;
-pub use secure_poly::{combine_secure_value, SecureCirclePoly};
 
 #[cfg(test)]
 mod tests {
diff --git a/src/core/prover/mod.rs b/src/core/prover/mod.rs
index 497f12079..abecd21c5 100644
--- a/src/core/prover/mod.rs
+++ b/src/core/prover/mod.rs
@@ -12,7 +12,8 @@ use crate::core::circle::CirclePoint;
 use crate::core::commitment_scheme::{CommitmentSchemeProver, CommitmentSchemeVerifier};
 use crate::core::fields::m31::BaseField;
 use crate::core::fields::qm31::SecureField;
-use crate::core::poly::circle::{combine_secure_value, CircleEvaluation};
+use crate::core::fields::secure::combine_secure_value;
+use crate::core::poly::circle::CircleEvaluation;
 use crate::core::poly::BitReversedOrder;
 use crate::core::ComponentVec;