What is an encryption?
Data can be jumbled using encryption so that only people with the proper authorization can decipher it.
Technically speaking, it's the process of transforming legible plaintext for humans into unintelligible text or
ciphertext. To put it another way, encryption modifies readable data to make it appear random. A cryptographic
key, a collection of agreed-upon mathematical values by the sender and the recipient of an encrypted communication
is necessary for encryption.
Realm Encryption
To prevent data, you store on disk from being read by anyone other than the application, you can hide your realms.
For the realm encryption key, do not use cryptographically weak hashes. To best protect, it is recommended that
realm encryption key be generated on a random basis. To encrypt the realm file to disk using AES256 + SHA2
encryption, you provide a 64-bit key when it opens. Realm domain straightforwardly encodes and decodes information
with standard AES-256 encryption, utilizing the initial 256 pieces of the given 512-bit encryption key.
Realm domain utilizes the other 256 pieces of the 512-bit encryption key to approve respectability utilizing a
hash-based message confirmation code (HMAC).
Considerations
When encrypting a realm, keep the following important effects in mind.
- Reusing and Storing Keys
- Performance Influence
- Atlas Device Sync and Encryption
Reusing and Storing Keys
Each time you open the encrypted realm, you have to pass the same realm encryption key. The Realm SDK raises an
error if you specify the incorrect key or don't supply a key at all for an encrypted realm.
To prevent key leaking, applications should keep the realm encryption key safely. Usually, this is done in the
target platform's secure key/value storage. For easier access to underlying storage, you may utilise Xamarin
Secure Storage or MAUI Secure Storage, for instance. In the end, the developer has the obligation of making sure
that the key is inaccessible to attackers.
Performance Influence
Encrypted realm reads and writes can be up to 10% slower than unencrypted realms. Because full disc encryption
encrypts and decrypts data continuously, it may have a detrimental impact on system performance. Limited
flexibility: Sharing possibilities for non-sensitive data on the drive may be limited since all files are
protected using full disc encryption.
Note: You have to provide the same realm encryption key each time you get a Realm instance. When you run
GetInstance on an encrypted Realm, you will receive a RealmFileAccessErrorException if you don't supply a key or
if you submit the incorrect key.
Atlas Device Sync and Encryption
A synchronized realm is encryptable. Data synchronization between client apps and an Atlas App Services backend is
automatically accomplished via Atlas Device Sync. Sync asynchronously synchronizes data in a background thread
between a client device and your backend application while the device is online.
You may use an OAuth provider (like MAUI.Auth and Xamarin.Auth) or one of the MongoDB realm Authentication
providers and an Authentication Trigger to produce 64-bit keys that can be stored in user objects if you require
separate keys for each user of your application.
The following codes demonstrates how to generate an encryption key and open an encrypted realm:
Realm Encryption key
Open an encrypted realm
Conclusion
Threats to cybersecurity aren't going away. The volume of cyberattacks and the sophisticated methods used to
obtain information have increased yearly.
Businesses must use encryption to safeguard systems and data. It's among the best solutions for preventing
unwanted people from accessing sensitive data. These above techniques ensure that even if hackers gain access to
your system data, they won't be able to see, read, or do anything with it. Without the encryption key, the data
will continue to be unreadable.