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create your own qr codes in excel 4: Cryptography in Software
4: Cryptography Quick Response Code Printer In None Using Barcode creation for Software Control to generate, create QR Code 2d barcode image in Software applications. QR Code JIS X 0510 Recognizer In None Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications. This is a simple function, but its security has withstood the test of more than 20 years of analysis Considering the effectiveness of RSA s security and the ability to have two keys, why are symmetric encryption algorithms needed at all The answer is speed RSA in software can be 100 times slower than DES, and in hardware it can be even slower RSA can be used to perform both regular encryption and digital signatures Digital signatures try to duplicate the functionality of a physical signature on a document using encryption Typically RSA and the other public key systems are used in conjunction with symmetric key cryptography Public key, the slower protocol, is used to exchange the symmetric key (or shared secret), and then the communication uses the faster symmetric key protocol This process is known as electronic key exchange Since the security of RSA is based upon the supposed difficulty of factoring large numbers, the main weaknesses are in the implementations of the protocol Until recently, RSA was a patented algorithm, but it was a de facto standard for many years Print QR Code ISO/IEC18004 In C# Using Barcode drawer for .NET Control to generate, create QR Code JIS X 0510 image in Visual Studio .NET applications. QR Code Generation In VS .NET Using Barcode creation for ASP.NET Control to generate, create QR Code image in ASP.NET applications. PART II
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Make GS1128 In None Using Barcode maker for Software Control to generate, create USS128 image in Software applications. Painting Code 128B In None Using Barcode printer for Software Control to generate, create Code128 image in Software applications. DiffieHellman was created in 1976 by Whitfield Diffie and Martin Hellman This protocol is one of the most common encryption protocols in use today It plays a role in the electronic key exchange method of the Secure Sockets Layer (SSL) protocol It is also used by the SSH and IPsec protocols DiffieHellman is important because it enables the sharing of a secret key between two people who have not contacted each other before The protocol, like RSA, uses large prime numbers to work Two users agree to two numbers, P and G, with P being a sufficiently large prime number and G being the generator Both users pick a secret number, a and b Then both users compute their public number: User 1 X = Ga mod P, with X being the public number User 2 Y = Gb mod P, with Y being the public number The users then exchange public numbers User 1 knows P, G, a, X, and Y User 1 Computes Ka = Ya mod P User 2 Computes Kb = Xb mod P With Ka = Kb = K, now both users know the new shared secret K This is the basic algorithm, and although there have been methods created to strengthen it, DiffieHellman is still in wide use It remains very effective because of the nature of what it is protecting a temporary, automatically generated secret key that is good only for a single communication session Bar Code Generation In None Using Barcode drawer for Software Control to generate, create barcode image in Software applications. Draw Barcode In None Using Barcode maker for Software Control to generate, create bar code image in Software applications. CompTIA Security+ AllinOne Exam Guide
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Generating ANSI/AIM ITF 25 In None Using Barcode encoder for Software Control to generate, create ITF image in Software applications. Painting Code 128 In None Using Barcode generator for Online Control to generate, create Code128 image in Online applications. ElGamal can be used for both encryption and digital signatures Taher ElGamal designed the system in the early 1980s This system was never patented and is free for use It is used as the US government standard for digital signatures The system is based upon the difficulty of calculating discrete logarithms in a finite field Three numbers are needed to generate a key pair User 1 chooses a prime, P, and two random numbers, F and D F and D should both be less than P Then you can calculate the public key A: A = DF mod P Then A, D, and P are shared with the second user, with F being the private key To encrypt a message, M, a random key, k, is chosen that is relatively prime to P 1 Then, C1 = Dk mod P C2 = AkM mod P C1 and C2 makes up the ciphertext Decryption is done by M = C2/C1F mod P ElGamal uses a different function for digital signatures To sign a message, M, once again choose a random value k that is relatively prime to P 1 Then, C1 = Dk mod P C2 = (M C1 * F)/k (mod P 1) C1 concatenated to C2 is the digital signature ElGamal is an effective algorithm and has been in use for some time It is used primarily for digital signatures Like all asymmetric cryptography, it is slower than symmetric cryptography Generating ANSI/AIM Code 128 In None Using Barcode maker for Microsoft Excel Control to generate, create Code 128A image in Excel applications. Painting EAN / UCC  13 In Java Using Barcode maker for Android Control to generate, create GTIN  128 image in Android applications. Elliptic curve cryptography (ECC) works on the basis of elliptic curves An elliptic curve is a simple function that is drawn as a gently looping curve on the X,Y plane They are defined by this equation: y2 = x3 + ax2 + b Elliptic curves work because they have a special property you can add two points on the curve together and get a third point on the curve For cryptography, the elliptic curve works as a public key algorithm Users agree on an elliptic curve and a fixed curve point This information is not a shared secret, and these points can be made public without compromising the security of the system User 1 then chooses a secret random number, K1, and computes a public key based upon a point on the curve: P1 = K1 * F USS Code 39 Encoder In .NET Framework Using Barcode encoder for Reporting Service Control to generate, create Code 39 Full ASCII image in Reporting Service applications. Code 3 Of 9 Maker In None Using Barcode encoder for Font Control to generate, create Code 39 Extended image in Font applications. Encoding USS128 In Visual Studio .NET Using Barcode creation for ASP.NET Control to generate, create UCC128 image in ASP.NET applications. DataMatrix Encoder In None Using Barcode encoder for Microsoft Excel Control to generate, create Data Matrix 2d barcode image in Microsoft Excel applications. 
