TAILIEUCHUNG - Hacker Professional Ebook part 167

Tham khảo tài liệu 'hacker professional ebook part 167', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | A polynomial only evenly divisible by itself and 1. The polynomial analogy to integer primes. Often used to generate a residue class field for polynomial operations. A polynomial form of the ever-popular Sieve of Eratosthenes can be used to build table of irreducibles through degree 16. That table can then be used to check any potential irreducible through degree 32. While slow this can be a simple clear validation of other techniques. Also see primitive polynomial. IV Initial value initializing value or initialization vector. An external value needed to start off cipher operations. Most often associated with CBC mode. An IV often can be seen as a design-specific form of message key. Sometimes iterative ciphering under different IV values can provide sufficient keying to perform the message key function. Generally an IV must be accompany the ciphertext and so always expands the ciphertext by the size of the IV. Jitterizer A particular cryptographic mechanism intended to complicate the sequence produced by a linear random number generator by deleting elements from the sequence at pseudo-random. The name is taken from the use of an oscilloscope on digital circuits where a signal which is not in sync is said to jitter. Mechanisms designed to restore synchronization are called synchronizers so mechanisms designed to cause jitter can legitimately be called jitterizers. KB Kilobyte. 210 or 1024 bytes. Kb Kilobit. 210 or 1024 bits. Kerckhoffs Requirements General cryptosystem requirements formulated in 1883 from the Handbook of Applied Cryptography 1. The system should be if not theoretically unbreakable unbreakable in practice. Of course there are no realized systems which are theoretically unbreakable but there is also little point in using a known breakable cipher. 2. Compromise of the system details should not inconvenience the correspondents. Nowadays we generally assume that the Opponent will have full details of the cipher since for a cipher to be widely used it .

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