hex1A4.net
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TrueCrypt
Open source security tool for the encryption all data on a harddisk partition or storage device like a USB drive. TrueCrypt also allows for the creation of a virtual drive on a PC, which can be considered a safe for all important documents. Once data is encrypted only the owner can access it—even if the PC or drive should be stolen the data is still safe. TrueCrypt supports the following ciphers: Advanced Encryption Standard (AES), Blowfish, CAST5, Serpent, Triple DES and Twofish.
Wireshark
Wireshark is a fantastic open source network protocol analyzer. It allows users to examine data from a live network or from a capture file on disk. One can interactively browse the captured data, delving down into just the level of packet detail needed. It has several powerful features, including a rich display filter language and the ability to view the reconstructed stream of a TCP session. It also supports hundreds of protocols and media types. A tcpdump-like console version named tethereal is included. One word of caution is that Wireshark has suffered from dozens of remotely exploitable security holes, so stay up-to-date and be wary of running it on untrusted or hostile networks (such as security conferences).
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