diff --git a/poulpy-core/examples/encryption.rs b/poulpy-core/examples/encryption.rs
index 08e1595..898170f 100644
--- a/poulpy-core/examples/encryption.rs
+++ b/poulpy-core/examples/encryption.rs
@@ -1,9 +1,9 @@
 use poulpy_core::{
-    GLWESub, SIGMA,
     layouts::{
-        Base2K, Degree, GLWE, GLWELayout, GLWEPlaintext, GLWEPlaintextLayout, GLWESecret, LWEInfos, Rank, TorusPrecision,
-        prepared::GLWESecretPrepared,
+        prepared::GLWESecretPrepared, Base2K, Degree, GLWELayout, GLWEPlaintext, GLWEPlaintextLayout, GLWESecret, LWEInfos, Rank,
+        TorusPrecision, GLWE,
     },
+    GLWESub, SIGMA,
 };
 
 #[cfg(all(feature = "enable-avx", target_arch = "x86_64"))]
@@ -71,14 +71,33 @@ fn main() {
     let mut sk_prepared: GLWESecretPrepared<Vec<u8>, BackendImpl> = GLWESecretPrepared::alloc(&module, rank);
     sk_prepared.prepare(&module, &sk);
 
+    // DBG:
+    // obtain pk from sk
+    let mut pk = poulpy_core::layouts::GLWEPublicKey::alloc_from_infos(&glwe_ct_infos);
+    pk.generate(&module, &sk_prepared, &mut source_xa, &mut source_xe);
+    // Backend-prepared publickey:
+    let mut pk_prepared: poulpy_core::layouts::GLWEPublicKeyPrepared<Vec<u8>, BackendImpl> =
+        poulpy_core::layouts::GLWEPublicKeyPrepared::alloc(&module, base2k, k_ct, rank);
+    pk_prepared.prepare(&module, &pk);
+
     // Uniform plaintext
     module.vec_znx_fill_uniform(base2k.into(), &mut pt_want.data, 0, &mut source_xa);
 
     // Encryption
-    ct.encrypt_sk(
+    // ct.encrypt_sk(
+    //     &module,
+    //     &pt_want,
+    //     &sk_prepared,
+    //     &mut source_xa,
+    //     &mut source_xe,
+    //     scratch.borrow(),
+    // );
+
+    // DBG: encrypt with public key
+    ct.encrypt_pk(
         &module,
         &pt_want,
-        &sk_prepared,
+        &pk_prepared,
         &mut source_xa,
         &mut source_xe,
         scratch.borrow(),
diff --git a/poulpy-core/src/encryption/glwe.rs b/poulpy-core/src/encryption/glwe.rs
index 06b6426..ea83def 100644
--- a/poulpy-core/src/encryption/glwe.rs
+++ b/poulpy-core/src/encryption/glwe.rs
@@ -401,6 +401,9 @@ where
                 // ci_big = u * p[i]
                 let mut ci_big = self.vec_znx_idft_apply_consume(ci_dft);
 
+                // to print it run: cargo run --example encryption -- --nocapture
+                println!("DBG: ci_big before adding e: {:?}", &ci_big.data);
+
                 // ci_big = u * pk[i] + e
                 self.vec_znx_big_add_normal(base2k, &mut ci_big, 0, pk.k().into(), source_xe, SIGMA, SIGMA_BOUND);