Multimedia Content Encryption: Techniques and Applications
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Advertisement Hide. Multimedia Encryption: A Brief Overview. This process is experimental and the keywords may be updated as the learning algorithm improves. This is a preview of subscription content, log in to check access. Schneier, B. Menezes, A. Mao, W. Wu, M. Ali, S. IEEE Int. Yinian, M. IEEE Trans. Lookabaugh, T. In: SPIE.
Multimedia Content Encryption : Techniques and Applications
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What is Perceptual Encryption? - Cryptography Stack Exchange
Meeting, vol. Jiang-Lung, L. Karl, M. Maples, T. Li, Y. Agi, I. Alternative methods of breaking a cipher include side-channel attacks, which don't attack the actual cipher but the physical side effects of its implementation. An error in system design or execution can allow such attacks to succeed. The challenge of successfully attacking a cipher is easier if the cipher itself is already flawed. More recently, law enforcement agencies such as the FBI have criticized technology companies that offer end-to-end encryption, arguing that such encryption prevents law enforcement from accessing data and communications even with a warrant.
Department of Justice has proclaimed the need for "responsible encryption" that can be unlocked by technology companies under a court order. The use of encryption is nearly as old as the art of communication itself. As early as B. In a time when most people couldn't read, simply writing a message was often enough, but encryption schemes soon developed to convert messages into unreadable groups of figures to protect the message's secrecy while it was carried from one place to another.
The contents of a message were reordered transposition or replaced substitution with other characters, symbols, numbers or pictures in order to order to conceal its meaning. In B. When the tape was unwound, the characters became meaningless, but with a stick of exactly the same diameter, the recipient could recreate decipher the message.
So, for example, if the agreed number is three, then the message, "Be at the gates at six" would become "eh dw wkh jdwhv dw vla". At first glance this may look difficult to decipher, but juxtaposing the start of the alphabet until the letters make sense doesn't take long. The Middle Ages saw the emergence of polyalphabetic substitution, which uses multiple substitution alphabets to limit the use of frequency analysis to crack a cipher.
This method of encrypting messages remained popular despite many implementations that failed to adequately conceal when the substitution changed, also known as key progression. Possibly the most famous implementation of a polyalphabetic substitution cipher is the Enigma electromechanical rotor cipher machine used by the Germans during World War II. It was not until the mids that encryption took a major leap forward. Until this point, all encryption schemes used the same secret for encrypting and decrypting a message: a symmetric key. In , Whitfield Diffie and Martin Hellman's paper "New Directions in Cryptography" solved one of the fundamental problems of cryptography: namely, how to securely distribute the encryption key to those who need it.
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This content is part of the Essential Guide: Essential guide to business continuity and disaster recovery plans. This was last updated in May Related Terms cryptosystem A cryptosystem is a structure or scheme consisting of a set of algorithms that converts plaintext to ciphertext to encode or Login Forgot your password? Forgot your password? No problem! Submit your e-mail address below.
We'll send you an email containing your password. Your password has been sent to:. Please create a username to comment. Will the industry ever reach a point where all encryption algorithms can be broken by brute force and rendered useless or uneconomic? I would like to say that this could never happen, given the strength of today's encryption and the robustness of the algorithms, but "never" is a long time. Technology tends to advance in exponential leaps, so I guess it's possible that it "could" happen someday.
However, it is not possible today, even with existing super computers. The NSA is trying to get to the point where it can crack anything, but I doubt it's there yet and probably won't be for a while. I suspect this is more like an arms race where as one side gains temporary advantage, the other innovates and we are back to the middle. The bad guys will figure out how to create a trojan that steals CPU cycles from all over the world to break encryption - meanwhile the good guys will find a way to add another 64 bits, making the decrypt cycles take exponentially longer for brute force -- and on and on it will go.