RSADERP

local component = require("component")
local cipher = component.advanced_cipher
local keygen = cipher.createRandomKeySet() --replace with createKeySet(prime1,prime2)

while not keygen.finished() do
  os.sleep(0.5) --wait some time to let the keygen finish, may be less or more than 0.5
end

local pubKey, privKey = keygen.getKeys()

--There you are, you have two keys.

local msg = "I am a Pastryfork!"
print(msg)
print("-----")
local cpt = cipher.encrypt(msg, pubKey)
print(cpt)
print("-----")
local nw = cipher.decrypt(cpt, privKey)
print(nw)