The world will little note, nor long remember what we say here, but it can never forget what they did here. The brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract. But, in a larger sense, we can not dedicate - we can not consecrate - we can not hallow - this ground. It is altogether fitting and proper that we should do this. We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that nation might live. We are met on a great battle-field of that war. Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived and so dedicated, can long endure. com/misc/vigenere/ Four score and seven years ago our fathers brought forth on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal. 's computer networks, and says that progress has been made. Schmidt stresses the importance of private-public collaboration to secure the U. Lynn III recently said that the threat to the intellectual property of the government, universities, and businesses may represent "the most significant cyberthreat" facing the United States. Lewis with the Center for Strategic and International Studies. "You've got a lot of agreement on what the problem is but very little agreement on the solution, both within the government and outside, " notes James A. Meanwhile, Congress has drafted numerous cybersecurity bills, but the White House has yet to assume a stance on any of them. Critics also charge that officials have failed to allay privacy fears or determine the extent to which the government should regulate or cooperate with the private sector to ensure that critical industries are shielded against hackers. In 2009 the administration revealed a cyberspace policy review, while the president appointed White House cybercoordinator Howard Schmidt to bring the government's initiatives into sync-but the administration is still debating whether it requires new legal authorities or whether such actions are permitted by existing statutes. government is still struggling with key cybersecurity issues more than a year after President Obama deemed the protection of computer systems a national priority. Out of which we can guess that the key is 2019.Substitution Cipher http: //25 yearsofprogramming. In the table above, given the ciphertext and the plaintext, we subtract the latter from the former to obtain 201920192019201920192019 This recovers the key up to its length $\ell$, which need not be known in advance. Similarly, given a plaintext/ciphertext pair, we can recover the key in the sense of constructing the sequence
In the table above, given the cipher and the key, we just need to subtract the key from the cipher, borrowing if necessary (so 3-9=4 since 13-9=4). The key is an arbitrary word, $k_0 \ldots k_$, we simply reverse the process: A Vigenère cypher on an alphabet of size $M$, which we identify with the integers modulo $M$, works as follows.