diff --git a/base2k/src/sampling.rs b/base2k/src/sampling.rs
index 212658a..b2d6f22 100644
--- a/base2k/src/sampling.rs
+++ b/base2k/src/sampling.rs
@@ -297,8 +297,6 @@ where
 
 #[cfg(test)]
 mod tests {
-    use std::fmt::Display;
-
     use super::{AddNormal, FillUniform};
     use crate::vec_znx_ops::*;
     use crate::znx_base::*;
diff --git a/base2k/src/scalar_znx_dft_ops.rs b/base2k/src/scalar_znx_dft_ops.rs
index a4b3ccc..a51d72f 100644
--- a/base2k/src/scalar_znx_dft_ops.rs
+++ b/base2k/src/scalar_znx_dft_ops.rs
@@ -2,8 +2,8 @@ use crate::ffi::svp;
 use crate::ffi::vec_znx_dft::vec_znx_dft_t;
 use crate::znx_base::{ZnxInfos, ZnxView, ZnxViewMut};
 use crate::{
-    Backend, FFT64, Module, ScalarToRef, ScalarZnxDft, ScalarZnxDftOwned, ScalarZnxDftToMut, ScalarZnxDftToRef, VecZnx,
-    VecZnxDft, VecZnxDftToMut, VecZnxDftToRef, VecZnxToRef, ZnxSliceSize,
+    Backend, FFT64, Module, ScalarToRef, ScalarZnxDft, ScalarZnxDftOwned, ScalarZnxDftToMut, ScalarZnxDftToRef,
+    VecZnxDft, VecZnxDftToMut, VecZnxDftToRef,
 };
 
 pub trait ScalarZnxDftAlloc<B: Backend> {
diff --git a/rlwe/src/elem.rs b/rlwe/src/elem.rs
index 3cb1360..1126ed4 100644
--- a/rlwe/src/elem.rs
+++ b/rlwe/src/elem.rs
@@ -1,13 +1,12 @@
 use base2k::{
-    Backend, DataView, DataViewMut, MatZnxDft, MatZnxDftAlloc, MatZnxDftToMut, MatZnxDftToRef, Module, VecZnx, VecZnxAlloc,
-    VecZnxDft, VecZnxDftAlloc, VecZnxDftToMut, VecZnxDftToRef, VecZnxToMut, VecZnxToRef, ZnxInfos,
+    Backend, DataView, DataViewMut, MatZnxDft, MatZnxDftAlloc, MatZnxDftToMut, MatZnxDftToRef, Module, ScalarZnxDftToRef, VecZnx,
+    VecZnxAlloc, VecZnxDft, VecZnxDftAlloc, VecZnxDftToMut, VecZnxDftToRef, VecZnxToMut, VecZnxToRef, ZnxInfos,
 };
 
-pub trait Infos<T>
-where
-    T: ZnxInfos,
-{
-    fn inner(&self) -> &T;
+pub trait Infos {
+    type Inner: ZnxInfos;
+
+    fn inner(&self) -> &Self::Inner;
 
     /// Returns the ring degree of the polynomials.
     fn n(&self) -> usize {
@@ -48,17 +47,16 @@ where
     fn log_q(&self) -> usize;
 }
 
-pub struct Ciphertext<T> {
-    data: T,
+pub struct RLWECt<C>{
+    data: VecZnx<C>,
     log_base2k: usize,
     log_q: usize,
 }
 
-impl<T> Infos<T> for Ciphertext<T>
-where
-    T: ZnxInfos,
-{
-    fn inner(&self) -> &T {
+impl<T: ZnxInfos> Infos for RLWECt<T> {
+    type Inner = T;
+
+    fn inner(&self) -> &Self::Inner {
         &self.data
     }
 
@@ -90,11 +88,10 @@ pub struct Plaintext<T> {
     log_q: usize,
 }
 
-impl<T> Infos<T> for Plaintext<T>
-where
-    T: ZnxInfos,
-{
-    fn inner(&self) -> &T {
+impl<T: ZnxInfos> Infos for Plaintext<T> {
+    type Inner = T;
+
+    fn inner(&self) -> &Self::Inner {
         &self.data
     }
 
diff --git a/rlwe/src/encryption.rs b/rlwe/src/encryption.rs
index de3146f..e0f9e1f 100644
--- a/rlwe/src/encryption.rs
+++ b/rlwe/src/encryption.rs
@@ -6,13 +6,16 @@ use base2k::{
 
 use sampling::source::Source;
 
-use crate::{elem::Infos, keys::SecretKey};
+use crate::{
+    elem::{Ciphertext, Infos, Plaintext},
+    keys::SecretKey,
+};
 
-pub trait EncryptSk<B: Backend, D, P> {
+pub trait EncryptSk<B: Backend, C, P> {
     fn encrypt<S>(
         module: &Module<B>,
-        res: &mut D,
-        pt: Option<&P>,
+        res: &mut Ciphertext<C>,
+        pt: Option<&Plaintext<P>>,
         sk: &SecretKey<S>,
         source_xa: &mut Source,
         source_xe: &mut Source,
@@ -22,20 +25,18 @@ pub trait EncryptSk<B: Backend, D, P> {
     ) where
         S: ScalarZnxDftToRef<B>;
 
-    fn encrypt_tmp_bytes(module: &Module<B>, size: usize) -> usize {
-        (module.vec_znx_big_normalize_tmp_bytes() | module.bytes_of_vec_znx_dft(1, size)) + module.bytes_of_vec_znx_big(1, size)
-    }
+    fn encrypt_scratch_bytes(module: &Module<B>, size: usize) -> usize;
 }
 
-impl<C, P> EncryptSk<FFT64, C, P> for C
+impl<C, P> EncryptSk<FFT64, C, P> for Ciphertext<C>
 where
-    C: VecZnxToMut + ZnxInfos + Infos<C>,
-    P: VecZnxToRef,
+    C: VecZnxToMut + ZnxInfos,
+    P: VecZnxToRef + ZnxInfos,
 {
     fn encrypt<S>(
         module: &Module<FFT64>,
-        ct: &mut C,
-        pt: Option<&P>,
+        ct: &mut Ciphertext<C>,
+        pt: Option<&Plaintext<P>>,
         sk: &SecretKey<S>,
         source_xa: &mut Source,
         source_xe: &mut Source,
@@ -76,6 +77,41 @@ where
         // c0 = norm(c0_big = -as + m + e)
         module.vec_znx_big_normalize(log_base2k, &mut ct_mut, 0, &c0_big, 0, scratch_1);
     }
+
+    fn encrypt_scratch_bytes(module: &Module<FFT64>, size: usize) -> usize {
+        (module.vec_znx_big_normalize_tmp_bytes() | module.bytes_of_vec_znx_dft(1, size)) + module.bytes_of_vec_znx_big(1, size)
+    }
+}
+
+impl<C> Ciphertext<C>
+where
+    C: VecZnxToMut + ZnxInfos,
+{
+    pub fn encrypt_sk<P, S>(
+        &mut self,
+        module: &Module<FFT64>,
+        pt: Option<&Plaintext<P>>,
+        sk: &SecretKey<S>,
+        source_xa: &mut Source,
+        source_xe: &mut Source,
+        scratch: &mut Scratch,
+        sigma: f64,
+        bound: f64,
+    ) where
+        P: VecZnxToRef + ZnxInfos,
+        S: ScalarZnxDftToRef<FFT64>,
+    {
+        <Self as EncryptSk<FFT64, _, _>>::encrypt(
+            module, self, pt, sk, source_xa, source_xe, scratch, sigma, bound,
+        );
+    }
+
+    pub fn encrypt_sk_scratch_bytes<P>(module: &Module<FFT64>, size: usize) -> usize
+    where
+        Self: EncryptSk<FFT64, C, P>,
+    {
+        <Self as EncryptSk<FFT64, C, P>>::encrypt_scratch_bytes(module, size)
+    }
 }
 
 pub trait EncryptZeroSk<B: Backend, D> {
@@ -91,17 +127,12 @@ pub trait EncryptZeroSk<B: Backend, D> {
     ) where
         S: ScalarZnxDftToRef<B>;
 
-    fn encrypt_zero_tmp_bytes(module: &Module<B>, size: usize) -> usize {
-        (module.bytes_of_vec_znx(1, size) | module.bytes_of_vec_znx_dft(1, size))
-            + module.bytes_of_vec_znx_big(1, size)
-            + module.bytes_of_vec_znx(1, size)
-            + module.vec_znx_big_normalize_tmp_bytes()
-    }
+    fn encrypt_zero_scratch_bytes(module: &Module<B>, size: usize) -> usize;
 }
 
 impl<C> EncryptZeroSk<FFT64, C> for C
 where
-    C: VecZnxDftToMut<FFT64> + ZnxInfos + Infos<C>,
+    C: VecZnxDftToMut<FFT64> + ZnxInfos + Infos,
 {
     fn encrypt_zero<S>(
         module: &Module<FFT64>,
@@ -146,4 +177,53 @@ where
         // ct[0] = DFT(-as + e)
         module.vec_znx_dft(&mut ct_mut, 0, &tmp_znx, 0);
     }
+
+    fn encrypt_zero_scratch_bytes(module: &Module<FFT64>, size: usize) -> usize{
+        (module.bytes_of_vec_znx(1, size) | module.bytes_of_vec_znx_dft(1, size))
+            + module.bytes_of_vec_znx_big(1, size)
+            + module.bytes_of_vec_znx(1, size)
+            + module.vec_znx_big_normalize_tmp_bytes()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use base2k::{FFT64, Module, ScratchOwned, VecZnx, Scalar};
+    use sampling::source::Source;
+
+    use crate::{elem::{Ciphertext, Infos, Plaintext}, keys::SecretKey};
+
+    #[test]
+    fn encrypt_sk_vec_znx_fft64() {
+        let module: Module<FFT64> = Module::<FFT64>::new(32);
+        let log_base2k: usize = 8;
+        let log_q: usize = 54;
+
+        let sigma: f64 = 3.2;
+        let bound: f64 = sigma * 6;
+
+        let mut ct: Ciphertext<VecZnx<Vec<u8>>> = Ciphertext::<VecZnx<Vec<u8>>>::new(&module, log_base2k, log_q, 2);
+        let mut pt: Plaintext<VecZnx<Vec<u8>>> = Plaintext::<VecZnx<Vec<u8>>>::new(&module, log_base2k, log_q);
+
+        let mut source_xe = Source::new([0u8; 32]);
+        let mut source_xa: Source = Source::new([0u8; 32]);
+        
+
+        let mut scratch: ScratchOwned = ScratchOwned::new(ct.encrypt_encsk_scratch_bytes(&module, ct.size()));
+
+        let mut sk: SecretKey<Scalar<Vec<u8>>> = SecretKey::new(&module);
+        let mut sk_prep
+        sk.svp_prepare(&module, &mut sk_prep);
+
+        ct.encrypt_sk(
+            &module,
+            Some(&pt),
+            &sk_prep,
+            &mut source_xa,
+            &mut source_xe,
+            scratch.borrow(),
+            sigma,
+            bound,
+        );
+    }
 }
diff --git a/rlwe/src/keys.rs b/rlwe/src/keys.rs
index 77f1d9a..ee8bb94 100644
--- a/rlwe/src/keys.rs
+++ b/rlwe/src/keys.rs
@@ -1,6 +1,5 @@
 use base2k::{
-    Backend, FFT64, Module, Scalar, ScalarAlloc, ScalarZnxDft, ScalarZnxDftOps, ScalarZnxDftToMut, Scratch, VecZnxDft,
-    VecZnxDftAlloc, VecZnxDftToMut,
+    Backend, Module, Scalar, ScalarAlloc, ScalarZnxDft, ScalarZnxDftAlloc, ScalarZnxDftOps, ScalarZnxDftToMut, Scratch, VecZnxDft, VecZnxDftAlloc, VecZnxDftToMut, ZnxInfos, FFT64
 };
 use sampling::source::Source;
 
@@ -43,6 +42,16 @@ impl SecretKey<Scalar<Vec<u8>>> {
     }
 }
 
+type SecretKeyPrep<C, B> = SecretKey<ScalarZnxDft<C, B>>;
+
+impl<B: Backend> SecretKey<ScalarZnxDft<Vec<u8>, B>> {
+    pub fn new(module: &Module<B>) -> Self{
+        Self{
+            data: module.new_scalar_znx_dft(1)
+        }
+    }
+}
+
 pub struct PublicKey<D, B: Backend> {
     data: VecZnxDft<D, B>,
 }