Simple Des

William Stallings Copyright 2006 Supplement to Cryptography and Ne devilrk Security, Fourth Edition Prentice residence hall 2006 ISBN 0-13-187316-4 http//williamstallings. com/Crypto/Crypto4e. html 8/5/05 change DES, developed by Professor Edward Schaefer of Santa Clara University SCHA96, is an educational rather than a secure encoding algorithmic rule. It has similar properties and structure to DES with frequently smaller parameters. The construeer might regain it useful to work through an example by and while following the discussion in this Appendix. C. 1 Overview Figure C. 1 illustrates the overall structure of the simplified DES, which we will refer to as SDES. The S-DES encryption algorithm takes an 8-bit choke up of plaintext (example 10111101) and a 10-bit line as input and let outs an 8-bit block of ciphertext as takings. The S-DES decryption algorithm takes an 8-bit block of ciphertext and the same 10-bit key use to farm that ciphertext as input and conjure ups the original 8-bit block of plaintext.The encryption algorithm involves five employments an initial heterotaxy (IP) a tortuous function labeled fK, which involves both refilling and telephone exchange operations and depends on a key input a simple exchange function that switches (SW) the two halves of the data the function fK again and finally a permutation function that is the inverse of the initial permutation (IP1). As was mentioned in Chapter 2, the use of multiple stages of permutation and substitution turn ups in a more than complex algorithm, which increases the difficulty of coding.The function fK takes as input not only the data passing through the encryption algorithm, but also an 8-bit key. The algorithm could have been designed to work with a 16-bit key, consisting of two 8-bit subkeys, one used for apiece occurrence of fK. Alternatively, a single 8-bit key could have been used, with the same key used double in the algorithm. A compromise is to use a 10-bi t key from which two 8-bit subkeys argon generated, as show in Figure C. 1. In this case, the key is first subjected to a permutation (P10). Then a sackful operation is performed.The railroad siding of the shift operation thence passes through a permutation function that produces an 8-bit make (P8) for the first subkey (K1 ). The output of the shift operation also feeds into another shift and another instance of P8 to produce the number subkey (K 2 ). We can concisely express the encryption algorithm as a composition1 of functions which can also be written as IP-1 o fK2 o SW o fK1 o IP ((( ciphertext = IP-1 fK 2 SW fK1 (IP(plaintext )) where ( K1 = P8 interchange (P10(key )) ( ( ))) ) K2 = P8 Shift Shift( P10( key)) )) Decryption is also shown in Figure C. and is essentially the reverse gear of encryption ((( plaintext = IP-1 fK1 SW fK 2 (IP(ciphertext )) 1 ))) Definition f f and g atomic number 18 two functions, then the function F with the equation y = F(x) = I gf(x) is called the composition of f and g and is denoted as F = g o f . C-2 8/5/05 We straight off examine the elements of S-DES in more detail. C. 2 S-DES Key Generation S-DES depends on the use of a 10-bit key shared between vector and receiver. From this key, two 8-bit subkeys are produced for use in particular stages of the encryption and decryption algorithm. Figure C. 2 depicts the stages followed to produce the subkeys.First, permute the key in the following fashion. Let the 10-bit key be designated as (k1 , k2 , k3 , k4 , k5 , k6 , k7 , k8 , k9 , k10). Then the permutation P10 is defined as P10(k1 , k2 , k3 , k4 , k5 , k6 , k7 , k8 , k9 , k10) = (k3 , k5 , k2 , k7 , k4 , k10, k1 , k9 , k8 , k6 ) P10 can be concisely defined by the display 3 5 2 7 P10 4 10 1 9 8 6 This table is read from leftover hand to right each position in the table gives the identity of the input bit that produces the output bit in that position. So the first output bit is bit 3 of the input the second outpu t bit is bit 5 of the input, and so on.For example, the key (1010000010) is permuted to (1000001100). Next, perform a circular left shift (LS-1), or rotation, separately on the first five bits and the second five bits. In our example, the result is (00001 11000). Next we apply P8, which picks out and permutes 8 of the 10 bits according to the following rule P8 6 3 7 4 8 5 10 9 The result is subkey 1 (K1 ). In our example, this yields (10100100) We then go back to the pair of 5-bit strings produced by the two LS-1 functions and perform a circular left shift of 2 bit positions on each string. In our example, the value (00001 11000) becomes (00100 00011).Finally, P8 is applied again to produce K2 . In our example, the result is (01000011). C. 3 S-DES Encryption Figure C. 3 shows the S-DES encryption algorithm in greater detail. As was mentioned, encryption involves the sequential application of five functions. We examine each of these. Initial and Final Permutations The input to the al gorithm is an 8-bit block of plaintext, which we first permute using the IP function IP 2 6 3 1 4 8 5 7 This retains all 8 bits of the plaintext but mixes them up. At the end of the algorithm, the inverse permutation is used C-3 8/5/05 1 3 IP1 57 2 8 6 It is easy to show by example that the second permutation is indeed the reverse of the first that is, IP1(IP(X)) = X. The Function fK The most complex component of S-DES is the function fK, which consists of a combination of permutation and substitution functions.The functions can be expressed as follows. Let L and R be the leftmost 4 bits and rightmost 4 bits of the 8-bit input to fK, and let F be a mapping (not necessarily one to one) from 4-bit strings to 4-bit strings. Then we let fK(L, R) = (L F(R, SK), R) where SK is a subkey and s the bit-by-bit exclusive-OR function. For example, pronounce the output of the IP stage in Figure C. 3 is (10111101) and F(1101, SK) = (1110) for some key SK. Then fK(10111101) = (01011101) because (1011) (1110) = (0101). We now describe the mapping F. The input is a 4-bit number (n 1 n2 n3 n4 ). The first operation is an expansion/permutation operation 4 1 2 E/P 32 3 4 1 For what follows, it is clearer to depict the result in this fashion n4 n2 n1 n3 n2 n4 n3 n1 The 8-bit subkey K1 = (k11, k12, k13, k14, k15, k16, k17, k18) is added to this value using exclusiveOR n4 11 n2 k15 n1 k12 n3 k16 n2 k13 n4 k17 n3 k14 n1 k18 p0,1 p1,1 p0,2 p1,2 p0,3 p1,3 Let us call these 8 bits p0,0 p1,0 The first 4 bits (first course of instruction of the preceding matrix) are fed into the S-box S0 to produce a 2bit output, and the remain 4 bits (second row) are fed into S1 to produce another 2-bit output. These two boxes are defined as follows C-4 8/5/05 0 S0 = 1 2 3 0 1 $3 $0 $3 1 0 2 2 1 2 3 1 1 3 3 2% 0 3 2 0 S1 = 1 2 3 0 0 $2 $3 $2 1 1 0 0 1 23 2 3% 1 3 1 0 0 3 & The S-boxes operate as follows.The first and fourth input bits are treated as a 2-bit number that specify a row of the S-box, and the second and third input bits specify a column of the Sbox. The entry in that row and column, in base 2, is the 2-bit output. For example, if (p0,0p0,3) = (00) and (p0,1p0,2) = (10), then the output is from row 0, column 2 of S0, which is 3, or (11) in binary star. alikely, (p1,0p1,3) and (p1,1p1,2) are used to index into a row and column of S1 to produce an additional 2 bits. Next, the 4 bits produced by S0 and S1 undergo a further permutation as follows P4 2 4 3 1 The output of P4 is the output of the function F.The Switch Function The function fK only alters the leftmost 4 bits of the input. The switch function (SW) interchanges the left and right 4 bits so that the second instance of f K operates on a different 4 bits. In this second instance, the E/P, S0, S1, and P4 functions are the same. The key input is K2 . C. 4 analysis of Simplified DES A brute-force attack on simplified DES is certainly feasible. With a 10-bit key, in that respect are only 2 10 = 10 24 possibilities. Given a ciphertext, an attacker can try each possibility and analyze the result to determine if it is reasonable plaintext. What about cryptanalysis?Let us lease a known plaintext attack in which a single plaintext (p1 , p2 , p3 , p4 , p5 , p6 , p7 , p8 ) and its ciphertext output (c1 , c2 , c3 , c4 , c5 , c6 , c7 , c8 ) are known and the key (k1 , k2 , k3 , k4 , k5 , k6 , k7 , k8 , k9 , k10) is unknown. Then each ci is a polynomial function gi of the pj s and kj s. We can and then express the encryption algorithm as 8 nonlinear equations in 10 unknowns. There are a number of possible solutions, but each of these could be calculated and then analyzed. Each of the permutations and additions in the algorithm is a linear mapping.The nonlinearity comes from the S-boxes. It is useful to write down the equations for these boxes. For clarity, rename (p0,0, p0,1,p0,2, p0,3) = (a, b, c, d) and (p1,0, p1,1,p1,2, p1,3) = (w, x, y, z), and let the 4-bit output be (q, r , s, t) Then the operation of the S0 is defined by the following equations q = abcd + ab + ac + b + d r = abcd + abd + ab + ac + ad + a + c + 1 where all additions are modulo 2. Similar equations define S1. Alternating linear maps with these nonlinear maps results in very complex polynomial expressions for the ciphertext bits, making cryptanalysis difficult.To visualize the scale of the problem, note that a polynomial equation in 10 unknowns in binary arithmetic can have 210 possible terms. On average, we might therefore C-5 8/5/05 pay each of the 8 equations to have 29 terms. The interested reader might try to find these equations with a symbolic processor. Either the reader or the software will give up before much progress is made. C. 5 Relationship to DES DES operates on 64-bit blocks of input. The encryption scheme can be defined as IP-1 o fK16 o SW o fK15 o SW oL o SW o f K1 o IPA 56-bit key is used, from which sixteen 48-bit subkeys are calculated. There is an initial permutation of 64 bits followed by a sequence of shifts and permutations of 48 bits. Within the encryption algorithm, instead of F acting on 4 bits (n1 n2 n3 n4 ), it acts on 32 bits (n1 n32). After the initial expansion/permutation, the output of 48 bits can be diagrammed as n32 n4 n28 n1 n5 n29 n2 n6 n30 n3 n7 n4 n8 n31 n32 n5 n9 n1 This matrix is added (exclusive-OR) to a 48-bit subkey. There are 8 rows, corresponding to 8 S-boxes. Each S-box has 4 rows and 16 columns.The first and last bit of a row of the preceding matrix picks out a row of an S-box, and the middle 4 bits pick out a column. C-6 10-bit key ENCRYPTION DECRYPTION P10 8-bit plaintext 8-bit plaintext Shift IP-1 IP K1 fK P8 K1 fK Shift SW SW K2 fK P8 K2 fK IP1 IP 8-bit ciphertext 8-bit ciphertext Figure C. 1 Simplified DES Scheme 10-bit key 10 P10 5 5 LS-1 LS-1 5 5 P8 K1 8 LS-2 LS-2 5 5 P8 K2 8 Figure C. 2 Key Generation for Simplified DES 8-bit plaintext 8 IP 4 fK 4 E/P 8 F 8 + 4 4 2 K1 2 S0 S1 P4 4 + 4 SW 4 fK 4 E/P 8 F 8 + 4 4 2 K2 2 S0 S1 P4 4 + 4 IP1 8 8-bit ciphertext Figure C. 3 Simplified DES Encryption Detail