W. Diffie and M. Hellman, \Exhaustive cryptanalysis of the NBS Data Encryption Standard. " Computer, vol. 10, no. 6, 74-84 (June 1977).  Home/Search   Document Not in Database   Summary   Related Articles   Check

..... 22 B.2 Driver chip: driver.vhdl . 24 B.3 Cryptographic Engine: crypt.vhdl . 26 1 INTRODUCTION 2 Implementation Year Cost per Blocks s Chips Time, Ref chip per 1M given 1M Diffie Hellman 77 20 1M 50k 17 days [DH77] Hoornaert, et al. 84 40 1.1M 25k 30 days [HGD85] AMD 84 19 218k 53k 72 days [AMD84] Wayner 92 30 448k 31k 30 days [Way93] VLSI Technology 92 170 3M 6k 47 days [VLS91] DEC 92 300 16M 3k 16 days [Ebe93] Wiener 93 11 50M 58k 4 hours [Wie94] Paper study. These tend to be rather ....

....a European team led by the Swiss Federal Institute of Technology in Zurich exhausted the key space of 48 bit RC5 in 13 days. The 56 bit key length of the Data Encryption Standard, DES, has likewise been claimed too small; Diffie and Hellman objected at the time of the standard s adoption, in 1977 [DH77] A number of papers have provided estimates of the cost and time of breaking DES using brute force search. Custom hardware invariably performs much better than software for this task; DES is not particularly suited to software implementation due to its employment of bit permutations and ....

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W. Diffie and M. Hellman. Exhaustive cryptanalysis of the NBS data encryption standard. Computer, 10(6):74--84, June 1977.

....computational power of the Internet. Special purpose hardware data points. At the cost of a one time investment a hardware attack is substantially faster than a software attack. In 1977 a 20 million parallel DES key searching machine was proposed with an expected search time of 12 hours (cf. [10]) in 1980 corrected to 50 million and 2 days (cf. 9] In a 1993 design by M. Wiener (cf. 31] the cost and expected time were down to one million dollar and 3.5 hours, respectively. In 1998 a 130,000 machine was built with an expected search time of 112 hours (cf. 16] see also [12] ....

....1999 (cf. 6] This factoring effort was estimated to cost at most 20 years on a PC with at least 64Mbytes of memory (or a single day on 7500 PCs) This time was spent almost entirely on the sieving step. It is less than 10 Mips Years and corresponds to fewer than 3 10 operations, whereas L[10 ] = 2 10 (omitting the o(1) This shows that L[n] overestimates the number of operations to be carried out for the factorization of n. The run time given here is the actual run time of the RSA155 factoring effort and should not be confused with the estimates given in [29] which appeared around ....

W. Diffie, E. Hellman, Exhaustive cryptanalysis of the NBS Data Encryption Standard, Computer, v. 10 (1977), 74-84.

....so that a software search using a generalpurpose computer is about twice as fast as a hardware implementation. The possibility of breaking DES encryption should also be considered. Although the issue of DES key recovery hardware has been debated for almost as long as the standard has been around [Diffie 1977] [Hellman 1979] it wasn t until 1993 that complete constructional details for a DES breaking machine were published [Wiener 1993] this type of device has since become known as a Wiener machine after the author of the paper) This would recover a DES key in 3.5 hours for a US 1M investment in ....

Whitfield Diffie and Martin Hellman, "Exhaustive Cryptanalysis of the NBS Data Encryption Standard", IEEE Computer, Vol.10, No.6 (June 1977), p.74.

....power of the Internet. 2.2.5 Special purpose hardware data points. At the cost of a one time investment a hardware attack is substantially faster than a software attack. In 1977 a 20 million dollar parallel DES key searching machine was proposed with an expected search time of 12 hours [11]. We write [ 20 million, 12 hours, 1977] hardware for this design. In [10] it was corrected to [ 50 million, 2 days, 1980] hardware. Mike Wiener published a detailed [ 1 million, 3.5 hours, 1993] hardware design [43] and special purpose [ 130,000, 112 hours, 1998] hardware was actually built ....

W. Die, E. Hellman, Exhaustive cryptanalysis of the NBS Data Encryption Standard, Computer, v. 10 (1977), 74-84.

....as DES to differential and linear cryptanalysis. The (apparent) strength of Double and two key triple DES against cryptanalysis coupled with the proven strength against generic attacks seem to make a strong combination that is absent for DESX. The basic meet in the middle attacks are due to [5, 12]. Even and Goldreich provide some time space tradeoffs for meet in the middle attacks [6] and Van Oorschot and Wiener [14] reduce the space requirements. Even and Goldreich [6] had shown that the cascade of m ciphers is at least as strong as its strongest component. Maurer and Massey [10] argued ....

W. Diffie and M. Hellman, "Exhaustive cryptanalysis of the NBS data encryption standard," Computer, Vol. 10, No. 6, pp. 74--84, June 1977.

....chaining; it prevents repeated text in the message from yielding correspondingly repeated sections of ciphertext. Other such modes of operation for the use of DES, as well as proposed techniques for key management, have been published by the National Bureau of Standards. Die and Hellman [50] argue that the choice of a 56 bit key makes DES vulnerable to a brute force attack. For 20 million one might be able to build a machine consisting of 2 20 chips, each of which can test 2 20 keys second, so that in 2 16 seconds (18:2 hours) the entire key space can be searched for the key ....

W. Die and M. E. Hellman. Exhaustive cryptanalysis of the NBS data encryption standard. Computer, 10:74-84, June 1977.

....part [4] They extrapolated their results for the algorithm to project a cost of 45,000 for a full cryptanalytic machine that would search through the entire key space in one year. There is much published research on custom hardware cryptanalytic machines for DES, dating as far back as 1977 [6]. Wiener is currently considered the best estimate of custom hardware performance [7] Gray and Kean implemented DES on the fine grained Configurable Array Logic device. This design faithfully implemented the standard DES architecture, thus exploiting the bit level parallelism but not partial ....

W. Diffie and M. E. Hellman, "Exhaustive Cryptanalysis of the NBS Data Encryption Standard," in IEEE Computer, vol. 10, 1977, pp. 74-84.

....was demonstrated that even in software a 56 bit key does not provide sufficient protection, when a DES key was found by exhaustive search using implementations distributed on the Internet. However, the problem of the small key size was pointed out already shortly after the publication of the DES [6]. Therefore, often the DES is used in a triple encryption scheme, where a plaintext is encrypted thrice with 3 independent keys, called triple DES. In another variant, called two key triple DES, the plaintext is first encrypted with a key K1, then decrypted with a key K2, and finally encrypted ....

....subkeys would need to be generated and thus the key schedule of DEAL would become more complex. 2. 1 Security of DEAL What can we say about the security of DEAL in general First note that for DEAL with 6 respectively 8 rounds a simple meet in the middle attack (similar to the one on doubleDES [6, 17]) will find the keys in the time of about 2 168 respectively 2 224 encryptions, 5 independent of the key schedule. For DEAL 192 this attack is faster than an exhaustive search for the key, but also requires a very large memory. Nevertheless, we suggest to do at least 8 rounds of encryption ....

W. Diffie and M. Hellman. Exhaustive cryptanalysis of the NBS data encryption standard. Computer, pages 74--84, 1977.

....encryption algorithm in the world. Despite its popularity, DES has been plagued with controversy. Some cryptographers objected to the closed door design process of the algorithm. The debate about whether DES key is too short for acceptable commercial security has raged for many years [DH79], but recent advances in distributed key search techniques have left no doubt in anyone s mind that its key is simply too short for today s security applications [Wie94, BDR 96] TripleDES has emerged as an interim solution in many high security applications, such as banking, but it is too slow ....

W. Die and M. Hellman, \Exhaustive Cryptanalysis of the NBS Data Encryption Standard," Computer, v. 10, n. 3, Mar 1979, pp. 74-84.

....encryption algorithm in the world. Despite its popularity, DES has been plagued with controversy. Some cryptographers objected to the closed door design process of the algorithm. The debate about whether DES key is too short for acceptable commercial security has raged for many years [DH79], but recent advances in distributed key search techniques have left no doubt in anyone s mind that its key is simply too short for today s security applications [Wie94, BDR 96] TripleDES has emerged as an interim solution in many high security applications, such as banking, but it is too slow ....

W. Di#e and M. Hellman, "Exhaustive Cryptanalysis of the NBS Data Encryption Standard," Computer, v. 10, n. 3, Mar 1979, pp. 74--84.

....computational power of the Internet. Special purpose hardware data points. At the cost of a one time investment a hardware attack is substantially faster than a software attack. In 1977 a 20 million parallel DES key searching machine was proposed with an expected search time of 12 hours (cf. [10]) in 1980 corrected to 50 million and 2 days (cf. 9] In a 1993 design by M. Wiener (cf. 29] the cost and expected time were down to one million dollar and 3.5 hours, respectively. In 1998 a 130,000 machine was built with an expected search time of 112 hours (cf. 14] see also [12] ....

....(cf. 6] This factoring effort was estimated to cost at most 20 years on a PC with at least 64Mbytes of memory (or a single day on 7500 PCs) This time was spent almost entirely on the sieving step. It is less than 10 4 Mips Years and corresponds to fewer than 3 10 17 operations, whereas L[10 155 ] = 2 10 19 (omitting the o(1) This shows that L[n] overestimates the number of operations to be carried out for the factorization of n. The run time given here is the actual run time of the RSA155 factoring effort and should not be confused with the estimates given in [27] which appeared ....

W. Diffie, E. Hellman, Exhaustive cryptanalysis of the NBS Data Encryption Standard, Computer, v. 10 (1977), 74-84.

....1. DES Attack Complexity 2. 1 Analysis Following are the major cryptanalytic attacks against DES: 1976: For a very small class of weak keys, DES can be broken with complexity 1 [HMS 76] 1977: Exhaustive search will become possible within 20 years, breaking DES with complexity 2 56 [DH77]. 1980: A time memory tradeo# can break DES faster at the expense of more memory. DES can be broken with time complexity 1 and 2 56 memory. 1982: For a very small class of semi weak keys, DES can be broken with complexity 1 [Dav82] 1985: A meet in the middle attack can break 6 round ....

W. Di#e and M.E. Hellman, "Exhaustive Cryptanalysis of the NBS Data Encryption Standard," Computer, v. 10, n. 6, Jun. 1977, pp. 74--84.

....encryption algorithm in the world. Despite its popularity, DES has been plagued with controversy. Some cryptographers objected to the closed door design process of the algorithm. The debate about whether DES key is too short for acceptable commercial security has raged for many years [DH79], but recent advances in distributed key search techniques have left no doubt in anyone s mind that its key is simply too short for today s security applications [Wie94, BDR 96] TripleDES has emerged as an interim solution in many high security applications, such as banking, but it is too slow ....

W. Diffie and M. Hellman, "Exhaustive Cryptanalysis of the NBS Data Encryption Standard," Computer, v. 10, n. 3, Mar 1979, pp. 74--84.

....could lower the operation count by a factor of 10 or 100, this means that even n = 1279 should not be considered safe, since it could then be broken using a less ambitious machine. Note that a machine using 10 6 chips running at around 10 nanoseconds per cycle was proposed by Diffie and Hellman [24] for finding a DES key in about a day through exhaustive search. Such a machine was generally thought to be too ambitious for the then current technology, but it seems to be generally accepted that it could be built for some tens of millions of dollars by 1990. On the other hand, n 2200 is ....

W. Diffie and M. E. Hellman, Exhaustive cryptanalysis of the NBS Data Encryption Standard, Computer 10 (1977), 74-84.

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W. Diffie and M. Hellman, \Exhaustive cryptanalysis of the NBS Data Encryption Standard. " Computer, vol. 10, no. 6, 74-84 (June 1977).

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Diffie, W. and M. Hellman, "Exhaustive Cryptanalysis of the NBS Data Encryption Standard", Computer, vol. 10, no. 6, pp. 74-84, June 1977.

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W. Diffie and M. Hellman, "Exhaustive cryptanalysis of the NBS Data Encryption Standard", Computer vol.10 no.6 (June 1977) pp. 74-84.

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W. Diffie and M. Hellman, "Exhaustive cryptanalysis of the NBS Data Encryption Standard", Computer vol.10 no.6 (June 1977) pp. 74-84.

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W. Diffie and M. E. Hellman. Exhaustive Cryptanalysis of the NBS Data Encryption Standard. Computer, 10(6):74--84, June 1977.

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W. Diffie and M.E. Hellman, Exhaustive cryptanalysis of the NBS Data Encryption Standard, Computer 10 (1977), 74-84.

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W. Di#e and M. Hellman, "Exhaustive cryptanalysis of the NBS data encryption standard," Computer , vol. 10, no. 6, pp. 74--84, 1997.

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W. Diffie and M.E. Hellman, Exhaustive cryptanalysis of the NBS Data Encryption Standard, Computer 10 (1977), 74-84.

No context found.

W. Diffie and M.E. Hellman. Exhaustive cryptanalysis of the NBS Data Encryption Standard. Computer, 10:74--84, 1977.

No context found.

W. Diffie and M. E. Hellman. Exhaustive cryptanalysis of the NBS data encryption standard. Computer, 10(6):74-84, June 1977.

No context found.

W. Diffie and M.E. Hellman. Exhaustive cryptanalysis of the NBS Data Encryption Standard. Computer, 10:74--84, 1977.

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