**RSA** got its name from first letter of the surname’s inventors (Ron **R**ivest, Adi **S**hamir & Leonard **A**dleman). RSA is an **Asymmetric Algorithm** that was first introduced in 1977, which is built into current operating systems by Microsoft, Apple, Sun and Novell. In hardware, the **RSA algorithm** can be found in secure telephones, Ethernet network cards and smart cards.

**Encryption**(__Note: m = Plaintext__)*m*^{e}mod n =*c*.

**Decryption**(__Note: c = Ciphertext__)*c*^{d}mod n =*m*.

The security of **RSA** is based on this difficulty, since the algorithm is based on an underlying mathematical problem. Specifically, it is the problem of factoring a given large number into prime numbers.

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