Q1). How would you approach the creation of a generalized program to decipher /break any encrypted message, independent of the technique used to create the cipher? What is your algorithm?
Answer: If the algorithm to decipher an encrypted message has to be independent of the technique used to create cipher, i could think of only brute force technique that attempts to try every key possible. However, this is not always feasible even with the computing powers that are available today. The success of brute force largely depends on the length of the key used for encryption. A longer key requires more computing time/power to and is exponentially more difficult to decipher the key. If n is the size of the key, the computer needs to check characters used to the power of key size combinations which means it could take million billion years or more depending on the size of key.
While DES, which uses 56 bit keys is relatively easier to crack compared to AES, which uses 126 bits symmetric keys and is still considered a strong encryption. The brute force attack typically checks all...
The Black Codes were legal statutes and constitutional amendments enacted by the ex Confederate states following the Civil War that sought to restrict the liberties of newly free slaves, to ensure a supply of inexpensive agricultural labor, and maintain a white dominated hierachy. (paragraph 1) In southern states, prior to the Civil War they enacted Slave Codes to regulate the institution of slavery. And northern non-slave holding states enacted laws to limit the black political power and social mobility. (paragraph 2) Black Codes were adopted after the Civil War and borrowed points from the antebellum slave laws as well as laws in the northern states used to regulate free blacks. (paragraph 3) Eventually, the Black Codes were extinguished when Radical Republican Reconstruction efforts began in 1866-67 along with the passage of the Fourteenth Amendment and civil rights legislation. The lives of the Black Codes did not have longevity but were significant. (paragraph 3)
The sender would type the message in plaintext (not encrypted) and the letters would be illuminated on a glass screen. With the press of each typewriter key the rotor would shift 1/26 of a revolution giving each letter a different encryption each time, which made the code so difficult to crack. Due to the complexity of the code the enigma became very useful for the Germans for radioing messages to u-boats. The cipher was finally broken when the British were able to capture some key documents from a German warship.
At this juncture, it may be somewhat difficult to accept the proposition that a threat to the telecommunications grid, both wired and wireless, in the United States could potentially be subject to a catastrophic cyber attack. After careful research on the subject, it appears the potentiality of an event of such magnitude, which either disrupts one or the other grids for a long period or destroys either, is both theoretically and realistically impossible. It may be that proponents—those who advance such theories—equate such “doomsday” scenarios as if a cyber attack would or could be of the same magnitude as a conventional or nuclear military strike. Terms such as “cyber Pearl Harbor,” “cyber 9/11” and “cyber Vietnam” have been used to describes potential catastrophic cyber attacks and yet, “Though many have posited notions on what a ‘real’ cyber war would be like, we lack the understanding of how such conflicts will be conducted and evolve.” (Rattray & Healey, 2010, p. 77). Yet, the U.S. government continues to focus on such events, as if the plausibility of small-scale cyber attacks were not as pressing.
What is encryption? Encryption is a technological technique that protects and secures the transfer of plain text information between two sources through the use of the internet. This is done by rearranging the text using a mathematical algorithm that renovates the message into an indecipherable form, which can only be unlocked and translated with a use of a key. The strength of the encryption key is measured by its length, which is determined by the number of bits and by the type of encryption program.
...ey, so the more random the keystrokes, the better is the data needed to generate the key (Senderek, 2003).
Codes, on their surface, reveal little. While they may take the form of numbers, letters, bytes, or symbols, the primary goal of most codes is either to conceal or condense information. In the context of codebreaking, the codes that pique the most interest are, of course, the ones that hide a message from unauthorized eavesdroppers. The role of the codebreaker is not always the honest one, for it is his/her job to undo the careful manipulations of the sender to uncover, without the key for the lock, what the message contains. To do this, he/she must rely on intuition, on reasoning, and sometimes on “luck,” to get his/her way.
Throughout the course of history, words have been gifted the unique ability to change what people think, positively or negatively. This is highlighted in The Book Thief by Markus Zusak which discusses a young girl who lives through the times of Nazi Germany. Liesel goes through countless predicaments which range from her hiding a Jewish man to losing everyone she ever knew. In The Book Thief, Zusak explores the power of words by analyzing the ways in which words can be used to change the way people perceive different events. By exploring the duality of the power of words, one is able to see how perspective can change for better or worse.
A clerk in the German government codes department, named Hans Schmidt, who got his job by way of having a senior military commander for a brother. His complicated personal life led him to contact the French intelligence in 1931 and offer to sell them top secret documents for money. Schmidt gave them both the Enigma machine's operating manual and its settings lists. Even with the information, the French and British code breakers at the time could not crack the code, so they contacted the Polish code breakers. The Polish realize that the only way to decipher the Enigma codes was to build an Enigma-like machine, which they do in 1932.
In the worst case, an entire database of private data could be accessible to the attacker and whomever he or she chooses to share it with. To prevent the recovery of this key by repeated guessing of each possibility, called a “brute force” attack by cryptographers because there is no intelligent method behind it, the key is made relatively long. Even with the rapid throughput of computer processing, a standard computer could take many thousands of years to try all of the potential 128-bit long keys. In response to the increasing resistance of encryption designs to these brute force attacks, security researchers have identified more complex methods of attack on encryption which use the analysis of physical characteristics to obtain the encryption key (Liu, Chang, & Lee, 2012). These methods are known collectively as side channel
Data Encryption is from the cryptography science, which includes coding and decoding of message to protect the safety. Development computer technology makes the encryption even more complicated. The ability for people to break codes is increasing, so are the ability to guard the codes. Many encryptions are available now. They were developed by some hi-tech company and sold, or you can choose some free service. Actually, when you are using the web browsers, emails, or even the basic system, your information has been automatically encrypted.
My knowledge has grown over the past six years, outwith the areas of learning offered by school courses, and I see this course as an opportunity to gain new skills and broaden my knowledge further. My main interests are varied, including communications and the internet, system analysis and design, software development, processors and low level machine studies. I have recently developed an interest in data encryption, hence my active participation in the RSA RC64 Secret-Key challenge, the latest international de-encryption contest from the RSA laboratories of America.
not practicing the interpretation of verbal cues on a consistent basis. The shield of text messaging is also used to avoid difficult face-to-face conversations.
Computer science is a vast field that includes nearly everything relating to computers. Everyday there is information transmitted all over the Internet. Pictures are uploaded, transactions are made on thousands of online retail websites, and banking transactions take place everyday on the Internet. All of these transactions have created a need for secure communications. People wish to keep things like banking, medical, and political information from the eyes of unwelcome parties. This has created a need for cryptography. Cryptography is the science or study of the techniques of secret writing, especially code and cipher systems, and is used by everyone from the average citizen to the government and military.
...M and the US National Security Agency. It was previously the most dominant type of encryption, but it is now being taken over by AES (Advanced Encryption Standard). Since data encryption standard, only took on a 56-bit symmetric key encryption, AES uses three key sizes, 128, 192, and 256 bits. When personal computer users want to encrypt email or other documents, they go to Phillip Zimmerman?s "Pretty Good Privacy" software. This software allows you to digitally sign a message, which verifies to the recipient that you are the sender and that no interfering is involved.
“In the early years of World War II,” (Sales), the airways in Poland were flooded with coded messages that created confusion with the “cryptanalyst working in the cipher bureau” (Maziakowski). Over a several years over Poland received thousands of messages but still hadn’t any luck.