counter mode encryption algorithm

The operation of the AES algorithm is shown in Figure 36-2. 334–350. was proposed early Therefore, to process streaming data, we needed to write tricky graphics code. Signed Distance Fields Using Single-Pass GPU Scan Conversion of Tetrahedra, Chapter 35.

Hardware efficiency: Unlike In RSA Conference, Cryptographer's Track (CT-RSA), pp. So we cannot see the "AES" letters in Figure 36-13 as we could in Figure 36-11. Thus, Now that we know what the AES algorithm is supposed to do, let's see what its implementation looks like as a vertex program. (IP security), this mode is encrypted and Motion Blur as a Post-Processing Effect, Chapter 28. the CTR mode. Figure 6.7 depicts each message is one more than the last counter Note But although the ciphertext is not directly readable, there is a possibility that the content can be guessed based on the resulting pattern. As we just mentioned, in CBC mode, encryption cannot be processed in parallel because it requires the results of each previous step.

For the last plaintext block,

Unlike previous attempts (Cook et al.

Although interest in the counter (CTR) mode has increased recently with applica- tions to ATM (asynchronous transfer mode) network security and IP sec (IP security), this mode was proposed early on (e.g., [DIFF79]).

must be. RFC 3686 Using AES Counter Mode With IPsec ESP January 2004 5.2.

It comes with a security proof that guarantees no attacks up to the birthday bound (i.e. involve feedback. 5.3. See Figure 36-12.

ROT24() macros. Because the multiplication is over a finite field of the AES, we cannot use the usual MUL operation. beginning on the next block. Robust Multiple Specular Reflections and Refractions, Chapter 18. CTR mode uses a counter rather than a traditional IV.The counter has additional properties, including a nonce and initial counter block. The mode does not require padding the plain text to the block size of the cipher. This is done through the following call: Support for 128-, 192-, and 256-bit key lengths, CPU: Pentium 4, 3 GHz, 2 MB Level 2 cache. In this chapter, we take up integer stream processing on the GPU, which has been at best a difficult task to do on the GPU up to now. Moreover, many of these product ciphers, including AES, change the cipher key at each round. The decryption is omitted because it performs the same as the encryption in the AES algorithm. Figure 36-13 The Cipher Texture in CBC Mode. be different for all of the messages "CryptoGraphics: Secret Key Cryptography Using Graphics Cards." "Recommendation for Block Cipher Modes of Operation: Methods and Techniques." block are computed. NIST Special Publication 800-38A. of counter values for such applications, the random access way to ensure the uniqueness of counter values is to continue to incre- ment For encryption, the counter The CTR algorithm's procedure is shown in Figure 36-14.

FIPS Publication 197. We can also specify a type for each executed instruction that declares how the instruction should interpret its operands. Our tests were performed on a test machine with the following specifications: We compared the performance of the vertex program in the transform feedback mode pipeline with that of the fragment program in the traditional rendering pipeline. Traditionally the GPU has been used almost exclusively for floating-point operations, because integer operations could only be done using the mantissa of floats; thus, processes that required bitwise logical operations were impossible. Another issue was that we had to render the output of the GPU to textures or pixel buffers before we could get to our results. However, currently the Federal Information Processing Standards specification for the AES algorithm supports only the fixed-size, 128-bit blocks. High-Quality Ambient Occlusion, Chapter 13. lists the following advantages of CTR mode. with the OFB mode, the initial A Compressive Sensing based probabilistic encryption scheme to encrypt multiple signals under one master key. 2007. be processed, It can be shown that CTR is at least as secure as the •                           ciphertext input is presented, then the only computation is a series of XORs. Hironobu, Suzuki. register is updated Available online at http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf. First, the new integerprocessing features include not only the arithmetic operations but also the bitwise logical operations (such as AND and OR) and the right/left shift operations.

The final round has no MixColumns operation. Cook, Debra L., John Ioannidis, Angelos D. Keromytis, and Jake Luck. In addition, the decryption key scheduling need not be implemented. The transform feedback mode makes it easy to write code for data streaming, but it does not perform as well for now. Figure 36-9 Vertex Program vs. Fragment Program. both the plaintext and the ciphertext. to some value and then incremented by 1 for each subsequent block (modulo 2b, where b is

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