Introduction to Cryptography: Principles and Applications by Hans Delfs, Helmut Knebl

By Hans Delfs, Helmut Knebl

Due to the fast progress of electronic communique and digital facts trade, details safety has turn into an important factor in undefined, enterprise, and management. sleek cryptography offers crucial options for securing info and conserving data.

In the 1st half, this booklet covers the most important innovations of cryptography on an undergraduate point, from encryption and electronic signatures to cryptographic protocols. crucial suggestions are proven in protocols for key trade, consumer id, digital elections and electronic money. within the moment half, extra complex themes are addressed, similar to the bit defense of one-way services and computationally excellent pseudorandom bit turbines. the safety of cryptographic schemes is a critical subject. standard examples of provably safe encryption and signature schemes and their defense proofs are given. although specific awareness is given to the mathematical foundations, no targeted heritage in arithmetic is presumed. the mandatory algebra, quantity thought and chance thought are integrated within the appendix. every one bankruptcy closes with a set of workouts.

The moment version comprises corrections, revisions and new fabric, together with an entire description of the AES, a longer part on cryptographic hash services, a brand new part on random oracle proofs, and a brand new part on public-key encryption schemes which are provably safe opposed to adaptively-chosen-ciphertext attacks.

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Extra info for Introduction to Cryptography: Principles and Applications (Information Security and Cryptography)

Example text

If we concatenate all the round keys, we get a string of Nb (Nr + 1) words. We call this string the expanded key. The expanded key is derived from the secret key k by the key expansion procedure, which we describe below. The round keys key0 , key1 , key2 , . . , keyNr are then selected from the expanded key E xpKey: key0 consists of the first Nb words of E xpKey, key1 consists of the next Nb words of E xpKey, and so on. To explain the key expansion procedure, we use functions fj , defined for multiples j of Nk , and a function g.

The block recovered from ci will appear random (here we assume that even a small change in the input of a block cipher will produce a randomlooking output), while the plaintext recovered from ci+1 has bit errors precisely where ci did. The block ci+2 is decrypted correctly. The cipher-block chaining mode is self-synchronizing, even if one or more entire blocks are lost. A lost ciphertext block results in the loss of the corresponding plaintext block and errors in the next plaintext block. In both the electronic codebook mode and cipher-block chaining mode, Ek−1 is applied for decryption.

3 4 g ◦ h denotes the composition of maps: g ◦ h(x) := g(h(x)). As usual, if f : D −→ R is a bijective map, we denote the inverse map by f −1 . 18 2. Symmetric-Key Encryption Notation. k16 for DESk to indicate that the round keys, derived from k, are used in this order for encryption. 4 means that the DES encryption function may also be used for decryption. For decryption, the round keys k1 . . k16 are supplied in reverse order. 4. k16 (x)) = x. k16 = id. Proof. k16 = IP−1 ◦ φ1 ◦ µ ◦ φ2 ◦ . .

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