Pandora other pains" (100). Prometheus had (fearing further reprisals) warned his brother Epimetheus not to accept any gifts from Zeus. But Epimetheus did not listen; he accepted Pandora, who promptly scattered the contents of her jar. As a result, Hesiod tells us, "the earth and sea are full of evils" (101). One item, however, did not escape the jar (96–9): <poem> Only Hope was left within her unbreakable house, she remained under the lip of the jar, and did not fly away. Before [she could], Pandora replaced the lid of the jar. This was the will of aegis-bearing Zeus the Cloudgatherer.</poem>
S-box years out of a concern that a "backdoor" — a vulnerability known only to its designers — might have been planted in the cipher. The S-box design criteria were eventually published (in ) after the public rediscovery of differential cryptanalysis, showing that they had been carefully tuned to increase resistance against this specific attack. Biham and Shamir found that even small modifications to an S-box could significantly weaken DES. There has been a great deal of research into the design of good S-boxes, and much more is understood about their use in block ciphers than when DES was released. Any