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Category Archives for "Security"

Surprised by Spam

I attended my first in person meeting of the ISOC Advisory Council this last week — I’m a newly minted co-chair, and already haven’t been participating as much as I should (just like I don’t blog here as much as I should, a situation I’m undertaking to resolve!). We had a long discussion on the […]

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Russ White

Principal Engineer at Ericsson

Russ White has scribbled a basket of books, penned a plethora of patents, written a raft of RFCs, taught a trencher of classes, nibbled and noodled at a lot of networks, and done a lot of other stuff you either already know about — or don't really care about. You can find Russ at 'net Work, the Internet Protocol Journal, and his author page on Amazon.
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The post Surprised by Spam appeared first on Packet Pushers Podcast and was written by Russ White.

Healthy Paranoia Show 10: Beware the Shmoo

Darkness falls across the land, The hacker hour is close at hand. Creatures crawl in search of 0-days To terrorize your enterprise. And whosoever shall be found, Without the soul for clamping down, Must stand and face the nerds of hell, And rot inside a clear text shell. The foulest stench is in the air, […]

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Mrs. Y

Snarkitecht at Island of Misfit Toys

Mrs. Y is a recovering Unix engineer working in network security. Also the host of Healthy Paranoia and official nerd hunter. She likes long walks in hubsites, traveling to security conferences and spending time in the Bat Cave. Sincerely believes that every problem can be solved with a "for" loop. When not blogging or podcasting, can be found using up her 15 minutes in the Twittersphere or Google+ as @MrsYisWhy.
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The post Healthy Paranoia Show 10: Beware the Shmoo appeared first on Packet Pushers Podcast and was written by Mrs. Y.

NetCitadel and Software Defined Security

It’s been an exciting couple of weeks in the security realm, with a number of innovative startups appearing. That’s refreshing because recently most “innovation” in the security space has been something involving a new way of marketing a signature or reputation based system – and that’s just a bit rubbish, and not a little tiresome. Most […]

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Neil Anderson

Neil is a freelance network security architect and contractor working with a number of clients in Scotland and Europe. He is CCIE #18705 and also holds a CISSP. He can often be found sampling beer in remote locations and ranting about tech to anyone too stupid to run away. If you're very unlucky, he may talk to you in Gaelic.

Neil can be occasionally be found on Twitter.

The post NetCitadel and Software Defined Security appeared first on Packet Pushers Podcast and was written by Neil Anderson.

Symmetric and Asymmetric Algorithms – Basic Differences


Symmetric uses only one key for both encryption and decryption. Sender and receiver share the same shared secret to transfer data securely. Algorithms include DES, 3DES, AES, IDEA, RC2/4/5/6, and Blowfish. Also referred to as "secret key" encryption.

DES - 56bit keys
3DES - 112bit and 168bit keys
AES - 128bit, 192bit, and 256bit keys
IDEA (International Data Encryption Alogrithm) - 128bit keys
RC2 - 40bit and 64bit keys
RC4 - 1bit to 256bit keys
RC5 - 0bit to 2040bit keys
RC6 - 128bit, 192bit, and 256bit keys
Blowfish - 32bit to 448bit keys


Asymmetric uses one key for encryption and another key for decryption referred to as public key infrastructure encryption. Key lengths generally ranging from 512 to 4096bits.

Example of asymmetric encryption RSA,EIGamal, Eliptical Curves, and Diffie Hellman
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