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Abstract: security is one of the most imperative commentaries in contemporary era. Especially, in terms of creating a safe channel. Create secure channel means the protection of information against an invader during exchanging the data through channel. Many procedures suggested overcoming this problem like cryptography, steganography, biometrics ….etc. In this paper, the propose system consist of two stages: the first is generated key called image key from an image while the second stage is applied Diffie Hellman based on the key which is created from the first step. The image key in our system is used instead of the two numbers which are needed compulsory in Hilleman algorithm. . In our proposal two client will not need to agree previously about the two numbers (prime and integer) which are basically the requirements in d,h algorithm to generate the shared key which should be used in ciphering process in advance. Moreover, the exchange key as a part of Diffie Hellman algorithm will be exchanged between parties through hiding it in own copy image of each party in specific position which are selected based on image key that are created in the first stage .The hiding process support a secure channel for two parties to exchange their keys securely. Moreover, support securely channel is done with keeping quality of stego- image due to limitation pixels which are used for hiding process.in addition the hiding process is applied in high bit plane 8th lsb to make it immune against channel effected like noise or compression. The system has been proved truly and the image key generated completely and exchange keys exchanged truly even if the channel has some effect on image like noise or compression.

Abstract: Security is one of the most important thingsin current era especially in sending information in unsecured channel, because of thedanger of attack the information during passing channel, many methods suggested to overcome this problem like cryptography, steganography, passwords, biometrics, barcode,......... each one of them contain a wide range of precisecorrect algorithmslike public key algorithms, substitution algorithms, polyalphabetic algorithms, DES algorithms, ......... in cryptography and so on in other methods. The proposed system cipher colored image by using information scrambling between bands of colored image firstly,then x-orwith number which is seen random but it is related to position of the pixel and the band of the colored image after that the result number will be x-ored with special key that discovered from another image. The key will be constructing by scanning image from start to end line after line andconsidering the sequence of pixels appearance as a colored key instead of original color of the pixel.

Steganography is an important area of research in recent years involving a number of applications. It is the science of embedding information into the cover images viz. text, video, and images. Various Steganography methods have been applied in terms of robustness, Imperceptibility (stego-image), and capacity. However, most of hiding image in image focus on capacity and Imperceptibility (image quality) and most of them need cover image to be 8 times bigger than secret image, for that reason this project focus on apply new techniques to reduce the size of cover image requiring by insert 4 bits in each pixel instead of one with mention to image quality. The quality of cover image is considered high due to the inserting process by add the message or inverse of message. Moreover, selecting a suitable pixel within the same block case less change to the cover image and keep quality of cover image too

Abstract:Varioussteganographytechniques for hidinginformationhavebeencreated.Steganographyistheartorscienceofhidingdatainsuch a meansthateventhereceivercannotestimatethepresenceoftheunseendataexceptheisresponsiveoftheaccomplishmentofhidingletter.The whole awarenessofsteganographyistoguaranteethatthetransferredmessageisfullycovered;bythismeansmakesurethatthemessageisreachableonlytotheintentionalreceiver.Steganographygenerate a protectedchanneltoexchangethetop-secretinformationbetween two parties.Inthisproject,several steganographytechniqueshavebeenanalyzed.Themainideaoftheprojectistointroduceanoverviewofimagesteganographytoidentifytherequirementsof a goodsteganographyapproachthetermsofgoodapproachisapplicationdepended.ingeneralThismethodologyshouldbeabletohide a secretmessageinanimagefile(coverimage)andshouldalsobeabletoextractthehiddeninformationfromthecoverimage..

Abstract: Inlastdecadesdifferenttechniqueshavebeencreated for hidinginformation. Theroleofhidinginformationistocreate a securecommunicationbetweenauthorizepartiesintermsofexchangetheirvitaldatainsafechannel.Steganographyis a methodofhidingdatainsuchanapproachnoonecanfeelthereis a hiddendataorfoundit.I.e.Onlytheauthorizepartycanextractthesedatabecauseheknowtheachievementofhidinginformation.inthispaper,anefficientmethodofhidingbinarytextimageviaanoptimalusingofFibonaccisequence.Digitalimageisconsideredtobethecoverimage. A binarytextimageisusedtorepresentthesecretmessageinsteadofnormaltext.Thismethodisused for thepurposeofhaving a chancetoreadthebinarytextimageifshouldanymodificationhappenalong thecommunicationchannel. (E.g. JPEG compression). A binarytextimageisanimagewhichincludes a textandcanbeconstructbyusinganysoftwareforimageprocessinglikepaint.

Abstract:Securityis an important part of computer science that deals with the protection of important information from access, change or modified, and delete, so there are many ways to improve the security of information like cryptography, steganography, biometrics, passwords, barcode..... Howevermostof these methods are consideredkeysrequired.These keys are used toimplement the changing of the information forsecure stylepurpose. For that reason, generating and keeping thesekeys isa major part of theappropriate securitysystem. Moreover, sending the key to the wanted person in unsacred channelis a widelyweakness part forany system. The proposed systemis a novel methodfor generating asecret unique key from an image. A generating process is appliedby discovering the essential colors in the image and constructing a table values for these essential colors , after that asuitable thresholdis usedto considered thesevalues are(0, 1)bitswhich will be used as stream bits key