how to create qr codes in excel 2013 4: Cryptography in Software

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quire 11 rounds, and 256-bit keys use 13 rounds Four steps are performed in every round: 1 Byte sub Each byte is replaced by its S-box substitute 2 Shift row Bytes are arranged in a rectangle and shifted 3 Mix column Matrix multiplication is performed based upon the arranged rectangle 4 Add round key This round s subkey is cored in These steps are performed until the final round has been completed, and when the final step has been performed, the ciphertext is output The Rijndael algorithm is well thought-out and has suitable key length to provide security for many years to come While no efficient attacks currently exist against AES, more time and analysis will tell if this standard can last as long as DES has PART II
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CAST is an encryption algorithm similar to DES in its structure It was designed by Carlisle Adams and Stafford Tavares CAST uses a 64-bit block size for 64- and 128-bit key versions, and a 128-bit block size for the 256-bit key version Like DES, it divides the plaintext block into a left half and a right half The right half is then put through function f and then is XORed with the left half This value becomes the new right half, and the original right half becomes the new left half This is repeated for eight rounds for a 64-bit key, and the left and right output is concatenated to form the ciphertext block CAST supports longer key lengths than the original 64 bits Changes to the key length affect the number of rounds: CAST-128 specifies 16 rounds and CAST-256 has 48 rounds This algorithm in CAST-256 form was submitted for the AES standard but was not chosen CAST has undergone thorough analysis with only minor weaknesses discovered that are dependent on low numbers of rounds Currently, no better way is known to break high-round CAST than by brute-forcing the key, meaning that with sufficient key length, CAST should be placed with other trusted algorithms
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RC is a general term for several ciphers all designed by Ron Rivest RC officially stands for Rivest Cipher RC1, RC2, RC3, RC4, RC5, and RC6 are all ciphers in the series RC1 and RC3 never made it to release, but RC2, RC4, RC5, and RC6 are all working algorithms
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RC2 was designed as a DES replacement, and it is a variable-key-size block-mode cipher The key size can be from 8 bits to 1024 bits with the block size being fixed at 64 bits RC2 breaks up the input blocks into four 16-bit words and then puts them
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through 18 rounds of one of two operations The two operations are mix and mash The sequence in which the algorithms works is as follows: 1 Initialize the input block to words R0 through R3 2 Expand the key into K0 through K63 3 Initialize j = 0 4 Five mix rounds 5 One mash round 6 Six mix rounds 7 One mash round 8 Five mix rounds This outputs 64 bits of ciphertext for 64 bits of plaintext The individual operations are performed as follows, with rol in this description meaning to rotate the word left This is the mix operation: Ri = Ri + Kj + (Ri-1 & Ri-2) + ((~Ri-1) & Ri-1) j=j+1 Ri = Ri rol si This is the mash operation: Ri = Ri + K[Ri-1 & 63] According to RSA, RC2 is up to three times faster than DES RSA maintained RC2 as a trade secret for a long time, with the source code eventually being illegally posted on the Internet The ability of RC2 to accept different key lengths is one of the larger vulnerabilities in the algorithm Any key length below 64 bits can be easily retrieved by modern computational power
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RC5 is a block cipher, written in 1994 It has multiple variable elements, numbers of rounds, key sizes, and block sizes The algorithm starts by separating the input block into two words, A and B A = A + S0 B = B + S1 For i=1 to r A = ((A XOR B) <<< B) + S2i B = ((B XOR A) <<< A) + S2i+1 A and B represent the ciphertext output This algorithm is relatively new, but if configured to run enough rounds, RC5 seems to provide adequate security for current bruteforcing technology Rivest recommends using at least 12 rounds With 12 rounds in the algorithm, cryptanalysis in a linear fashion proves less effective than brute-force against RC5, and differential analysis fails for 15 or more rounds A newer algorithm is RC6
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