Which two items are used in asymmetric encryption choose two a public key a DES key a TPM a private key a token navigation bar?
Public-key cryptography, or asymmetric cryptography, is an encryption scheme that uses two mathematically related, but not identical, keys - a public key and a private key. Unlike symmetric key algorithms that rely on one key to both encrypt and decrypt, each key performs a unique function. The public key is used to encrypt and the private key is used to decrypt. Show
It is computationally infeasible to compute the private key based on the public key. Because of this, public keys can be freely shared, allowing users an easy and convenient method for encrypting content and verifying digital signatures, and private keys can be kept secret, ensuring only the owners of the private keys can decrypt content and create digital signatures. Since public keys need to be shared but are too big to be easily remembered, they are stored on digital certificates for secure transport and sharing. Since private keys are not shared, they are simply stored in the software or operating system you use, or on hardware (e.g., USB token, hardware security module) containing drivers that allow it to be used with your software or operating system. Digital certificates are issued by entities known as Certificate Authorities (CAs). For more information on CAs, please see our related article - What are Certificate Authorities?. Business ApplicationsThe main business applications for public-key cryptography are:
Security Benefits of Digital SignaturesAssuming the private key has remained secret and the individual it was issued to is the only person with access to it, digitally signing documents and emails offers the following benefits.
Security Benefits of EncryptionAssuming the individual’s private key has not been compromised, encrypting data and messages offers the following security benefits.
The Android Keystore system lets you store cryptographic keys in a container to make them more difficult to extract from the device. Once keys are in the keystore, you can use them for cryptographic operations, with the key material remaining non-exportable. Also, the keystore system lets you restrict when and how keys can be used, such as requiring user authentication for key use or restricting keys to use only in certain cryptographic modes. See the Security Features section for more information. The keystore system is used by the Security featuresThe Android Keystore system protects key material from unauthorized use in two ways. First, it reduces the risk of unauthorized use of key material from outside the Android device by preventing the extraction of the key material from application processes and from the Android device as a whole. Second, the keystore system reduces the risk of unauthorized use of key material within the Android device by making apps specify the authorized uses of their keys and then enforcing those restrictions outside of the apps' processes. Key material of Android Keystore keys is protected from extraction using two security measures:
Hardware security moduleSupported devices running Android 9 (API level 28) or higher can have a StrongBox Keymaster, an implementation of the Keymaster or Keymint HAL that resides in a hardware security module-like secure element. While hardware security modules can refer to many different implementations of key-storage where a Linux kernel compromise can't reveal them, such as TEE, StrongBox explicitly refers to devices such as embedded Secure Elements (eSE) or on-SoC secure processing units (iSE). The module contains the following:
To support low-power StrongBox implementations, a subset of algorithms and key sizes are supported:
When generating or importing keys using the
Although StrongBox is a little slower and resource constrained (meaning that it supports fewer concurrent operations) compared to TEE, StrongBox provides better security guarantees against physical and side-channel attacks. If you want to prioritize higher security guarantees over app resource efficiency, we recommend using StrongBox on the devices where it is available. Wherever StrongBox isn't available, your app can always fall back to TEE to store key materials. To avoid unauthorized use of keys on the Android device, Android Keystore lets apps specify authorized uses of their keys when they generate or import the keys. Once a key is generated or imported, its authorizations can't be changed. Authorizations are then enforced by the Android Keystore whenever the key is used. This is an advanced security feature that is generally useful only if your requirements are that a compromise of your application process after key generation/import (but not before or during) can't lead to unauthorized uses of the key. Supported key use authorizations fall into the following categories:
As an additional security measure for keys whose key material is inside secure hardware (see You
can query whether a key's user authentication authorization is enforced by the secure hardware using Choose between a keychain and the Android Keystore providerUse the Use the Android Keystore provider to let an individual app store its own credentials, which only that app can access. This provides a way for apps to manage credentials that only they can use while providing the same security benefits that the Use the Android Keystore provider To use this feature, you use the standard
Generate a new private or secret keyTo generate a new The Security library provides a default implementation for generating a valid symmetric key, as shown in the following snippet:
Alternatively, you can use To generate the key pair, use a
Import encrypted keys into secure hardwareAndroid 9 (API level 28) and higher lets you import encrypted keys securely into the keystore using an ASN.1‑encoded key format. The Keymaster then decrypts the keys in the keystore, so the content of the keys never appears as plaintext in the device's host memory. This process provides additional key decryption security. To support secure importing of encrypted keys into the keystore, complete the following steps:
Work with keystore entriesYou can access the List entriesList entries in the keystore by calling the
Sign and verify dataSign data by fetching the
Similarly, verify data with the
Require user authentication for key useWhen generating or importing a key into the This is an advanced security feature that is generally useful only if your requirements are that a compromise of your application process after key generation/import (but not before or during) can't bypass the requirement for the user to be authenticated to use the key. When a key is only authorized to be used if the user has been authenticated, you can call
Each operation involving a specific key must be individually authorized by the user. Your app starts this process by calling For each
key that you create, you can choose to support a strong biometric credential, a lock screen credential, or both types of credentials. To determine whether the user has set up the credentials that your app's key relies on, call
If a key only supports biometric credentials, the key is invalidated by default whenever new biometric enrollments are added. You can configure the key to remain valid when new biometric enrollments are added. To do so, pass Learn more about how to add biometric authentication capabilities into your app, including how to show a biometric authentication dialog. Supported algorithms
Blog articlesSee the blog entry Unifying Key Store Access in ICS. Which two items are used in asymmetric encryption?Asymmetric encryption uses a mathematically related pair of keys for encryption and decryption: a public key and a private key.
Which key is used for asymmetric encryption?Asymmetric encryption is also called public key encryption, but it actually relies on a key pair. Two mathematically related keys, one called the public key and another called the private key, are generated to be used together. The private key is never shared; it is kept secret and is used only by its owner.
What are two asymmetric encryption algorithms choose two?Asymmetric Encryption Algorithms:
Elliptic Curve Digital Signature Algorithm (ECDSA) Rivest-Shamir-Adleman (RSA) Diffie-Hellman.
Which choices are examples of asymmetric encryption choose two?Examples of asymmetric encryption include:. Rivest Shamir Adleman (RSA). the Digital Signature Standard (DSS), which incorporates the Digital Signature Algorithm (DSA). Elliptical Curve Cryptography (ECC). the Diffie-Hellman exchange method.. TLS/SSL protocol.. |