What encryption methods are applied to phone number data at rest?

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Data at rest refers to information stored on a physical medium in any digital form (e.g., databases, data warehouses, or file storage). Protecting sensitive data such as phone numbers is critical, as it helps prevent unauthorized access, data breaches, and identity theft. Encryption is a key method used to secure this data. Here's an overview of the encryption methods commonly applied to phone number data at rest.

1. AES (Advanced Encryption Standard)
AES is the most widely used encryption algorithm for buy telemarketing data data at rest, including phone numbers. It is a symmetric encryption method, which means the same key is used for both encryption and decryption. AES supports key sizes of 128, 192, and 256 bits, with AES-256 being the most secure.

When phone numbers are stored in databases, AES encryption ensures they are unreadable to anyone without access to the decryption key. For example, a phone number like +1-202-555-0173 would be transformed into an unintelligible string of characters.

AES is often used in combination with other security measures such as secure key management and access control to provide robust protection.

2. RSA (Rivest–Shamir–Adleman)
RSA is an asymmetric encryption algorithm that uses a pair of keys—public and private. While RSA is more commonly used for encrypting small pieces of data or for secure key exchange, it can also be used to encrypt sensitive information like phone numbers in some specific use cases.

Because RSA is computationally more intensive than AES, it is usually not used for encrypting large volumes of data at rest. Instead, RSA may be used to encrypt AES keys, which then secure the phone number data.