text: In cryptography , DES-X ( or DESX ) is a variant on the DES ( Data Encryption Standard ) block cipher intended to increase the complexity of a brute force attack using a technique called key whitening .
simplified: In cryptography , DES-X ( or DESX ) is an alternative to the DES ( Data Encryption Standard ) block cipher designed to increase the complexity of a brute force attack using a technique called key whitening .