Biology

Biology, 17.07.2019 12:30, samtuck33

Des exhibits the classic block cipher structure, which consists of a number of identical rounds of processing.

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Computers and Technology, 04.09.2019 22:30, allisonklinger1786

Rsa is a public-key cryptosystem developed by mit professors ronald l. rivest, adi shamir, and leonard m. adleman in 1977 in an effort to ensure internet security. rsa uses modular arithmetic and elementary number theory to do computations using two very large prime numbers. identify the statement which is true for rc6 algorithm: a. is a variable key-size stream cipher with byte-oriented operations and is based on the use of a random permutationb. includes integer multiplication and the use of four 4-bit working registersc. is a parameterized algorithm with a variable block size, key size, and a variable number of roundsd. is a 64 bit block cipher that uses a key length that can vary between 32 and 448 bits

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Computers and Technology, 09.10.2019 21:30, rachelsweeney10

Suppose that alice and bob have access to two secure block ciphers,say, cipher a and cipher b, where cipher a uses a 64-bit key, whilecipher b uses a 128-bit key. alice prefers cipher a, while bob wants theadditional security provided by a 128-bit key, so he insists on cipher b.as a compromise, alice proposes that they use cipher a, but theyencrypt each message twice, using two independent 64-bit keys. assumethat no shortcut attack is available for either cipher. is alice's approachas secure as bob's?

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