AutofillNoiseInjectedData Class
Definition
Important
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Represents the noise-injected version of a text field's content, generated using a differential privacy algorithm.
[Android.Runtime.Register("android/view/autofill/AutofillNoiseInjectedData", ApiSince=37, DoNotGenerateAcw=true)]
public sealed class AutofillNoiseInjectedData : Java.Lang.Object, Android.OS.IParcelable, IDisposable[<Android.Runtime.Register("android/view/autofill/AutofillNoiseInjectedData", ApiSince=37, DoNotGenerateAcw=true)>]
type AutofillNoiseInjectedData = class
inherit Object
interface IParcelable
interface IJavaObject
interface IDisposable
interface IJavaPeerable- Inheritance
- Attributes
- Implements
Remarks
Represents the noise-injected version of a text field's content, generated using a differential privacy algorithm. While the Autofill providers won't be able to recover the actual text from the noise-injected data from one device, with uploads from sufficient number of devices, the Autofill providers are able to rebuild the constant, non-private parts of the text to help them improve Autofill detection's quality.
The noise injection process involves the following steps: 1. The original string is converted to a byte array using UTF-8 Encoding. The actual length of the string is hidden by padding with 0x0000 or truncating as needed. 2. Then for each bit in the byte array, random noise is introduced by "coin flipping": first we flip a coin to decide whether to change this bit. The probability is 50%. If we decide to change this bit, then we flip another coin to decide its new value. The probability is: 50% to be 1, 50% to be 0. 3. To further enhance privacy, each device may drop some of the bits after noise injection. getRetainedBitMask() tells you which bits are retained for the current payload.
With the coin flipping mechanism described above, each bit has 75% chance to report the real value, and 25% chance to report the opposite value(e.g. real value is 1, reported value is 0). This means if a bit remains the same across all devices(i.e. it's a part of a non-personalized string such as "Country or region"), then with a large enough amount of reports collected from different devices, then the ratio of real value among all reports should be close to 75%. In another word, if we see close to 75% of the reports show 1 then the real value of this bit should be a constant 1; if we see close to 75% of the reports show 0 then the real value of this bit should be a constant 0; all other distributions indicate this bit is not same across different devices(hence very likely to be personalized/private information), which should be discarded as noise.
Android reference for android.view.autofill.AutofillNoiseInjectedData.
Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.
Properties
| Name | Description |
|---|---|
| Class |
Returns the runtime class of this |
| Creator | |
| Handle |
The handle to the underlying Android instance. (Inherited from Object) |
| JniIdentityHashCode |
Gets the identity hash code assigned to this Java peer by the interop runtime. (Inherited from Object) |
| JniManagedPeerState | (Inherited from JavaObject) |
| JniPeerMembers | |
| PeerReference |
Gets the JNI object reference for this Java peer. (Inherited from Object) |
| RetainedBitMask |
Returns a bit mask indicating which bits were retained for each byte in the payload
returned by |
| ThresholdClass |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. (Inherited from Object) |
| ThresholdType |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. (Inherited from Object) |
Methods
| Name | Description |
|---|---|
| Clone() |
Creates and returns a copy of this object. (Inherited from Object) |
| Construct(JniObjectReference, JniObjectReferenceOptions) | (Inherited from JavaObject) |
| DescribeContents() |
Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. |
| Dispose() |
Releases the resources held by this Java peer. (Inherited from Object) |
| Dispose(Boolean) |
Releases the resources held by this Java peer. (Inherited from Object) |
| DisposeUnlessReferenced() | (Inherited from JavaObject) |
| Equals(Object) | (Inherited from JavaObject) |
| Equals(Object) |
Indicates whether some other object is "equal to" this one. (Inherited from Object) |
| GetHashCode() |
Returns a hash code value for the object. (Inherited from Object) |
| GetNoiseInjectedPayload() |
Gets the noise-injected and bit-reduced data. |
| JavaFinalize() |
Obsolete.
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (Inherited from Object) |
| Notify() |
Wakes up a single thread that is waiting on this object's monitor. (Inherited from Object) |
| NotifyAll() |
Wakes up all threads that are waiting on this object's monitor. (Inherited from Object) |
| SetHandle(IntPtr, JniHandleOwnership) |
Sets the Handle property. (Inherited from Object) |
| SetPeerReference(JniObjectReference, JniObjectReferenceOptions) | (Inherited from JavaObject) |
| ToArray<T>() |
Creates a managed array from this Java array wrapper. (Inherited from Object) |
| ToString() |
Returns a string representation of the object. (Inherited from Object) |
| UnregisterFromRuntime() |
Unregisters this Java peer from the interop runtime. (Inherited from Object) |
| Wait() |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>. (Inherited from Object) |
| Wait(Int64, Int32) |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object) |
| Wait(Int64) |
Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object) |
| WriteToParcel(Parcel, ParcelableWriteFlags) |
Flatten this object in to a Parcel. |
Explicit Interface Implementations
| Name | Description |
|---|---|
| IJavaPeerable.Disposed() | (Inherited from JavaObject) |
| IJavaPeerable.Finalized() | (Inherited from JavaObject) |
| IJavaPeerable.JniObjectReferenceControlBlock | (Inherited from JavaObject) |
| IJavaPeerable.SetJniIdentityHashCode(Int32) | (Inherited from JavaObject) |
| IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) | (Inherited from JavaObject) |
| IJavaPeerable.SetPeerReference(JniObjectReference) | (Inherited from JavaObject) |
| IJavaPeerable.UnregisterFromRuntime() | |
Extension Methods
| Name | Description |
|---|---|
| GetJniTypeName(IJavaPeerable) |
Gets the JNI name of the type of the instance |
| JavaAs<TResult>(IJavaPeerable) |
Try to coerce |
| JavaCast<TResult>(IJavaObject) |
Performs an Android runtime-checked type conversion. |
| JavaCast<TResult>(IJavaObject) | |
| TryJavaCast<TResult>(IJavaPeerable, TResult) |
Try to coerce |