For example , the Optimal Asymmetric Encryption Padding -LRB- OAEP -RRB- scheme uses a simple Feistel network to randomize ciphertexts in certain asymmetric key encryption schemes .

For example , the Optimal Asymmetric Encryption Padding -LRB- OAEP -RRB- scheme uses a simple Feistel network to randomize ciphertexts in certain asymmetric-key encryption schemes .
