I'm using Crypto++ for RSA encryption. My plain text exceeds FixedMaxPlaintextLength. What should I do?

Question

Should I break the text into chunks?

Is RSA the wrong encryption scheme?

Answer 1

Wrong scheme. The standard technique for message encryption (for example, PGP and CMS) is to generate a random symmetric session key K for something like AES and encrypted the message with AES using key K. Then encrypt K with the public key of each recipient of the message.

Answer 2

Typically, the asymmetric RSA algorithm is used for key exchanges. If you are encrypting larger chunks of data, it might be better to use something like AES.