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The RSA Algorithm
The Rivest-Shamir-Adleman (RSA) algorithm is one of the most popular and secure public-key encryption methods. The algorithm capitalizes on the fact that there is no efficient way to factor very large (100-200 digit) numbers

RSA encryption usually is only used for messages that fit into one block.

A 1024-bit RSA key invocation can encrypt a message up to 117 bytes, and results in a 128-byte value
A 2048-bit RSA key invocation can encrypt a message up to 245 bytes
RSA, as defined by PKCS#1, encrypts "messages" of limited size,the maximum size of data which can be encrypted with RSA is 245 bytes. No more