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the sha-1 hashing algorithm creates a digest that is how many bits in length?

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Trinidad Tremblay
Trinidad TremblayLv2
13 Mar 2020
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You've just deployed a new Cisco router that connects several network segments in your organization. The router is physically located in a server room that requires an ID card to gain access. You've backed up the router configuration to a remote location in an encrypted file. You access the router configuration interface from your notebook computer using a Telnet client with a user name of admin and a password of admin. You have used the MD5 hashing algorithm to protect the password. What should you do to increase the security of the device?

Consider a very simple symmetric block encryption algorithm in which 32-bits blocks of
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C = (PāŠ•K0 ) āŠž K1

where C = ciphertext, K = secret key, K0 = leftmost 64 bits of K, K1 = rightmost 64 bits of K,
āŠ• = bitwise exclusive OR, and āŠž is addition mod 264
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a) Show the decryption equation. That is, show the equation for P as a function of C, K0,
and K1.
b) Suppose and adversary has access to two sets of plaintexts and their corresponding
ciphertexts and wishes to determine K. We have the two equations:

C = (PāŠ•K0 ) āŠž K1 ; Cā€™

= (Pā€™āŠ•K0 ) āŠž K1

First, derive an equation in one unknown (e.g., K0). Is it possible to proceed further to
solve for K0?

30. A major characteristic of private IP addresses is that they a. are not routable on the internet b. are classes addresses c. have the length of 64 bits d. do not require MAC physical addresses

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