Abstract : Steganography is the methodology in science that involves communicating secret data in an appropriate multimedia carrier for e.g. video, audio and image files. Audio steganography hides data in a audio signal which is a cover signal without any modification in that cover signal. Generally, Steganography concept is confused with other technique such as cryptography and watermarking, but objectives such as imperceptibility, capacity of hidden data and robustness draws thin line between them. The prime goal of steganography is to reliably send hidden information secretly, and not to reveal its presence.
Public key cryptography is an asymmetric method that use a pair of keys for encryption: a public key which is used to encrypt data, and private, or secret key is used to decryption. It requires that a person must have a pair of public key and private key. The public key is distributed in the open so that anyone wishing to communicate with that in a secure way than he can use the receiver’s public key to convert the plaintext into cipher text. This cipher text cannot be converted into same plaintext using same public key. Therefore, there is no issue if some other person knows about public key.
JPEG IMAGE STEGANALYSIS USING MACHINE LEARNING Abstract—This project deals with detection of steganography content. Steganography is the additional method in cryptography which helps to hide the coded message inside pictures, audio or videos. To hide the message is important but to reveal such content is more important to avoid usage by criminals. This project applies an approach of supervised machine learning to detect the presence of steganographic content coded by programs like Steghide in the images. Keywords—Steganography, Stego-images, Cover-images, Steganalysis.
INTRODUCTION Steganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity . The word Steganography is of Greek origin and means “concealed writing” from the Greek words steganos meaning “covered or protected”, and graphing meaning “to write”. Steganography is the technique of hiding the message in a chosen carrier such that no one except the intended recipient is aware of its existence. Secrecy: Extraction of hidden data from the host medium should not be possible without the knowledge of the proper secret key used in the extracting procedure. Imperceptibility: After embedding the data in the medium, it should be imperceptible from the original medium.
Detecting outliers and analyzing large data sets can lead to discovery of unexpected knowledge in area such as fraud detection, telecommunication, web logs, and web document, etc. This paper focuses to clarify the problem with detecting outlier over data stream and specific techniques used for detecting outlier over streaming data in data mining.
In Preferential sampling the process that determines the data location and the process being modeled are stochastically dependent. In the over sample are the action of sample importantly higher than the doubly the twice the band width or peak relative frequency of the signal comprising sampled. Over sampling sample aids avoid aliasing, answer and brings down noise. The equation is used fs=2bb Where fs are the sample relative frequency and b are the bandwidth or maximum relative frequency of signal. Then
Even when the text file and key both get hacked or interpreted by third party user it will open up text file which does not contain actual secret message until he knows what actually an Algorithm used he can’t retrieve the original secret message. This protects the data from being invisible and hence be secure during transmission. The user at receiving end uses an Algorithm of code to retrieve the actual secret message from the cover text using Matrix file as key. Key words: Steganography, cryptography, cover text 1. INTRODUCTION Steganography is the art or practice of concealing a message, image, or file within another message, image, or file.
The conceivable spread transporters are blameless looking carriers (images, audio, video, text, or some other digitally representative code) which will hold the concealed data. A message is the data concealed and it may be plain text, cipher text, images, or anything that can be embedded into a bit torrent. It is composed of the cover carrier as well as the implanted message and it creates a stego-carrier. The concealing of data may oblige a stego key which is additional mystery data, for example, a secret word needed for implanting the information. When a secret message is hidden within a cover video, the subsequent item is a stego-video .
What is cryptography? Cryptography is the study of utilizing science to encode and unscramble information. Cryptography empowers you to store delicate data or transmit it crosswise over frail systems (like the Web) so it can't be perused by anybody aside from the expected beneficiary. While cryptography is the study of securing information, cryptanalysis is the study of examining and breaking secure correspondence. Established cryptanalysis includes a fascinating mix of systematic thinking, use of numerical instruments, example discovering, tolerance, determination, and good fortune.
3. Don’t allow any program remember (such as internet explorer) your passwords. It is risky. Hackers could steal such passwords without your knowledge. You should rather install a reputable password manager to remember your passwords.
One of the biggest issues is that all services use HTTP rather than HTTPS. HTTP is used to access the firewall, Opsview monitoring, and the documentation wiki. All three of these should have their traffic encrypted, especially the firewall because if that is compromised than an attacker has much more direct access to all other systems that are behind it. It would also be recommended to use an authentication database such as Active Directory to authenticate and authorize all users for these systems. This would make it much harder to compromise accounts if the local account is not being used.
Secret code is applied to the message and hashed and is sent to the receiver 6. Secret code is applied to the message and hashed and this hashed message is encrypted and sent to the receiver. It is used in digital signatures the hash is encrypted using sender’s private key and then encrypted using public key and sent to the receiver and the receiver decrypts the message using the private key. It is used in password storage A good system does not store the plaintext equivalent but store something else which include some randomness .so now if we use hash and because of its onewayness it is impossible to get back the password. If we use pure hash in the password and encrypt it, it can be broken easily by exhaustive search so that is why we have add some randomness to the password before the hash function is applied.
The Patriot Act and similar amendments passed in countries all over the world increased the demand for services, which redirect your traffic through a proxy server & encrypt it to prevent other internet users and even your ISP from spying on you. All for instance your ISP is able to see is that you established an encrypted connection to a server, nothing more. Using a proxy server is not completely secure, though. To communicate with your desired server providing the website you want to visit, the proxy has to decrypt your traffic and thus the internet provider of the proxy server is able to see the unencrypted data stream. This can be avoided by chaining proxies together or by simply using a service like Tor which redirects your traffic through 3 proxies, so called "nodes".
The government has a vested interest in the cyber security of their network. Thumb-drives can have devastating effects when connected to a network. They make the governments system vulnerable to viruses, malware, and other threats that can compromise the security of sensitive information. Also, thumb-drives or devices like them make it extremely easy to obtain data that should not be removed from government computers. This again gives the government a reasonable interest in the protection of “their” property to search these personally used