RSA encryption output size

Question

What is RSA encryption output size when using 2048 bit key and pkcs1padding.

Is it always 256 bytes independent of input size?

How can i calculate it for oth

Answer 1

The output size of plain RSA (using some padding scheme, but no hybrid encryption) is always the key size. The reason is that for some public key n the result is some integer c with 0<=c. There are lots of introductions for RSA, e.g. http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-045j-automata-computability-and-complexity-spring-2011/lecture-notes/MIT6_045JS11_rsa.pdf