XOR-analyze is a program for cryptanalysis one of the most easily-breakable and commonly used ciphers. Works with variable key length and includes an encryption/decryption program.
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Arping is an arp level ping utility which broadcasts a who-has ARP packet on the network and prints answers. Very useful when you are trying to pick an unused IP for a net that you don't yet have routing to, or to ping an ethernet address directly. Tested on Linux, {Free,Net,Open}BSD, MacOS X, and Solaris.
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