Basics of Contemporary Cryptography for IT Practitioners by Boris Ryabko

By Boris Ryabko

The purpose of this ebook is to supply a complete creation to cryptography with out utilizing advanced mathematical structures. the subjects are conveyed in a sort that basically calls for a simple wisdom of arithmetic, however the equipment are defined in adequate aspect to permit their desktop implementation.

The booklet describes the most strategies and amenities of latest cryptography, proving key effects alongside the way in which. The contents of the 1st 5 chapters can be utilized for one-semester direction.

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Extra resources for Basics of Contemporary Cryptography for IT Practitioners

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15 ’ 9 mod 33 = 15. We can see that Bob has deciphered the message. 30 Basics of Contemporary Cryptography for IT Practitioners The considered system is unbreakable if P and Q are large but has the following imperfection: A sends a message to B by utilising B’s public information (the numbers NB and d B ) . e. E can impersonate A. Surely, we need more complex protocols to avoid this. It is interesting that one of the possible solutions may be based entirely on the RSA scheme, as the following. A wants to send B message m.

Assume as before that Alice is going to sign documents. Alice chooses a large prime p and a number g such that different powers of g are different numbers modulo p (see Sec. 2). These numbers are transmitted or stored in clear and may be used by the whole community of users. Alice then selects a random number z, 1 < z < p - 1, which she keeps secret. This is her private key unknown to anybody. 5) and publishes it as her public key. Due to the hardness of discrete logarithm problem, it is assumed impossible to find x given p and g.

1 7 mod 22 = 2 1 . 10) that looks like (baaaab, 20, 21). The signed message is transmitted. Bob (or someone else) receives it and verifies the signature. 11) 53 mod 23 = 1 0 . e. the message is authentic. The considered digital signature scheme is somewhat more complex than RSA but its security is based on a different one-way function. It is important for cryptography because should one system be broken or compromised, the other may be used instead. Besides, ElGamal signature is a basis for a more efficient algorithm in which computation time is substantially reduced due to the use of “short” exponents.

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