Question 1

How to encrypt data with RSA in JavaScript using JSEncrypt?

Accepted Answer

Import JSEncrypt, set a public key using setPublicKey(), and call the encrypt() method. The README provides clear examples for both synchronous and asynchronous patterns, making implementation straightforward.

Question 2

JSEncrypt vs Web Crypto API for RSA encryption?

Accepted Answer

JSEncrypt is lightweight and zero-dependency with OpenSSL compatibility, while Web Crypto API is built into browsers but may have varying support. JSEncrypt offers more control for specific RSA use cases, but Web Crypto is more standardized for broader cryptographic operations.

Question 3

How to generate RSA keys securely with JSEncrypt?

Accepted Answer

For security, avoid JavaScript key generation; instead, use OpenSSL to generate keys offline as recommended in the README. JSEncrypt can then import these PEM-formatted keys, but in-browser generation is less secure due to entropy limitations.

Question 4

Can JSEncrypt encrypt large files?

Accepted Answer

No, RSA is inefficient for large data; it's best for encrypting small pieces like keys or messages. For files, use symmetric encryption and encrypt the symmetric key with RSA, as implied by the library's focus on RSA operations.

Question 5

What key sizes does JSEncrypt support?

Accepted Answer

JSEncrypt supports 512, 1024, 2048, and 4096-bit key sizes, with 2048-bit recommended as the minimum for production use, as detailed in the key generation section of the documentation.

Question 6

Is JSEncrypt safe for production use?

Accepted Answer

Yes, when used with OpenSSL-generated keys, as it builds on the battle-tested jsbn library. However, avoid JavaScript key generation for sensitive applications due to entropy concerns highlighted in the README.

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