[DOCS] add cache_encryption_callbacks docs (#26484)

### Details:
 - *add example of cache_encryption_callbacks in document*

### Tickets:
 - *CVS-123336*

---------

Co-authored-by: Chen Peter <peter.chen@intel.com>
Co-authored-by: Tatiana Savina <tatiana.savina@intel.com>
Co-authored-by: Karol Blaszczak <karol.blaszczak@intel.com>

Author: 4 people

docs/articles_en/assets/snippets/ov_caching.cpp

@@ -60,12 +60,43 @@ bool cachingSupported = std::find(caps.begin(), caps.end(), ov::device::capabili
     }
 }
 
+void part4() {
+    std::string modelPath = "/tmp/myModel.xml";
+    std::string device = "CPU";
+    ov::Core core;                                           // Step 1: create ov::Core object
+    core.set_property(ov::cache_dir("/path/to/cache/dir"));  // Step 1b: Enable caching
+    auto model = core.read_model(modelPath);                 // Step 2: Read Model
+//! [ov:caching:part4]
+ov::AnyMap config;
+ov::EncryptionCallbacks encryption_callbacks;
+static const char codec_key[] = {0x30, 0x60, 0x70, 0x02, 0x04, 0x08, 0x3F, 0x6F, 0x72, 0x74, 0x78, 0x7F};
+auto codec_xor = [&](const std::string& source_str) {
+    auto key_size = sizeof(codec_key);
+    int key_idx = 0;
+    std::string dst_str = source_str;
+    for (char& c : dst_str) {
+        c ^= codec_key[key_idx % key_size];
+        key_idx++;
+    }
+    return dst_str;
+};
+encryption_callbacks.encrypt = codec_xor;
+encryption_callbacks.decrypt = codec_xor;
+config.insert(ov::cache_encryption_callbacks(encryption_callbacks));  // Step 4: Set device configuration
+auto compiled = core.compile_model(model, device, config);            // Step 5: LoadNetwork
+//! [ov:caching:part4]
+    if (!compiled) {
+        throw std::runtime_error("error");
+    }
+}
+
 int main() {
     try {
         part0();
         part1();
         part2();
         part3();
+        part4();
     } catch (...) {
     }
     return 0;

docs/articles_en/assets/snippets/ov_caching.py

@@ -42,3 +42,20 @@
 # Find 'EXPORT_IMPORT' capability in supported capabilities
 caching_supported = 'EXPORT_IMPORT' in core.get_property(device_name, device.capabilities)
 # ! [ov:caching:part3]
+
+# ! [ov:caching:part4]
+import base64
+
+def encrypt_base64(src):
+    return base64.b64encode(bytes(src, "utf-8"))
+
+def decrypt_base64(src):
+    return base64.b64decode(bytes(src, "utf-8"))
+
+core = ov.Core()
+core.set_property({props.cache_dir: path_to_cache_dir})
+config_cache = {}
+config_cache["CACHE_ENCRYPTION_CALLBACKS"] = [encrypt_base64, decrypt_base64]
+model = core.read_model(model=model_path)
+compiled_model = core.compile_model(model=model, device_name=device_name, config=config_cache)
+# ! [ov:caching:part4]

docs/articles_en/openvino-workflow/running-inference/optimize-inference/optimizing-latency/model-caching-overview.rst

@@ -136,3 +136,27 @@ To check in advance if a particular device supports model caching, your applicat
          :language: cpp
          :fragment: [ov:caching:part3]
 
+Set "cache_encryption_callbacks" config option to enable cache encryption
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+If model caching is enabled, the model topology can be encrypted when saving to the cache and decrypted when loading from the cache. This property can currently be set only in ``compile_model``.
+
+.. tab-set::
+
+   .. tab-item:: Python
+      :sync: py
+
+      .. doxygensnippet:: docs/articles_en/assets/snippets/ov_caching.py
+         :language: py
+         :fragment: [ov:caching:part4]
+
+   .. tab-item:: C++
+      :sync: cpp
+
+      .. doxygensnippet:: docs/articles_en/assets/snippets/ov_caching.cpp
+         :language: cpp
+         :fragment: [ov:caching:part4]
+
+.. important::
+
+   Currently, this property is supported only by the CPU plugin. For other HW plugins, setting this property will not encrypt/decrypt the model topology in cache and will not affect performance. 

src/bindings/c/include/openvino/c/ov_property.h

@@ -108,9 +108,9 @@ OPENVINO_C_VAR(const char*)
 ov_property_key_cache_mode;
 
 /**
- * @brief Write-only property<ov_encryption_callbacks*> to set encryption/decryption function for model cache.
- * If ov_property_key_cache_encryption_callbacks is set, model cache will be encrypted/decrypted when saving/loading
- * model cache. ov_property_key_cache_encryption_callbacks is enabled in ov_core_compile_model_* only
+ * @brief Write-only property<ov_encryption_callbacks*> to set encryption and decryption function for model cache.
+ * If ov_property_key_cache_encryption_callbacks is set, model topology will be encrypted when saving to the cache and
+ * decrypted when loading from the cache. This property is set in ov_core_compile_model_* only
  * @ingroup ov_property_c_api
  */
 OPENVINO_C_VAR(const char*)
@@ -245,4 +245,4 @@ ov_property_key_enable_mmap;
  * @ingroup ov_property_c_api
  */
 OPENVINO_C_VAR(const char*)
-ov_property_key_auto_batch_timeout;
+ov_property_key_auto_batch_timeout;

src/inference/include/openvino/runtime/properties.hpp

@@ -791,8 +791,8 @@ struct EncryptionCallbacks {
 
 /**
  * @brief Write-only property to set encryption/decryption function for saving/loading model cache.
- * If cache_encryption_callbacks is set, the model cache will be encrypted/decrypted when saving/loading cache.
- * cache_encryption_callbacks is enabled in core.compile_model only.
+ * If cache_encryption_callbacks is set, the model topology will be encrypted when saving to the cache and decrypted
+ * when loading from the cache. This property is set in core.compile_model only.
  * - First value of the struct is encryption function.
  * - Second value of the struct is decryption function.
  * @ingroup ov_runtime_cpp_prop_api