June 11, 2011  2:34 AM

The American Cryptogram Association



Posted by: Ken Harthun
American Cryptogram Association, Ciphers, cryptogram, Cryptography

[caption id="attachment_1269" align="alignleft" width="263" caption="Naval Enigma Machine"]

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April 28, 2010  1:38 AM

Security Fun: Homophonic Cipher Security Challenge



Posted by: Ken Harthun
Cryptography, Security Challenge, Security fun

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October 8, 2009  2:18 AM

Hacking Skills Challenge – Level 6



Posted by: Ken Harthun
Cryptography, Ethical hacking, Password, Security

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March 20, 2009  1:35 AM

Another Little Known Tool to Securely Delete Files, Folders, and Volumes



Posted by: Ken Harthun
Cryptography, Data destruction, Data sanitization, Encryption, Opinion, Secure drive wipe, Security, Security management

Why, all of a sudden, is everyone concerned about secure file deletion? I hesitate to say it’s a sign of the poor economy, but perhaps people consider it even more important to protect their personal information when the idea of losing control of their assets—and their...


January 7, 2009  3:35 AM

MD5 Hashing Algorithm No Longer Safe



Posted by: Ken Harthun
Cryptography, hashing algorithm, MD5, Security, SHA1, Vulnerabilities

Just last week, two German security researchers, Alex Sotirov and Jacob Appelbaum, made a surprising announcement at the Chaos Communication Conference in Berlin: they had created a fraudulent Certificate Authority (CA) that had a valid signature from a root CA, Equifax, one of the oldest. The...


June 30, 2008  3:55 PM

Virtual Safe Deposit Box?



Posted by: Ken Harthun
Cryptography, DataManagement, Encryption, Opinion, Portable computing, Security

A bank safe deposit box, securely stored in a vault behind several feet of concrete on five sides with a virtually impenetrable combination-and-time-lock-protected door on the sixth side, is about as safe a storage place as you can get for your cash, gold, jewels, important documents, and other...


June 20, 2008  1:02 AM

WiFi Security–The Only Way is WPA



Posted by: Ken Harthun
Cryptography, Encryption, Password, Security, Security management, Security maxim, Wireless

Please note: since this article was posted, WPA-TKIP has been found to be vulnerable. See my post of 2008.11.13 entitled "WPA-TKIP Vulnerable to Attack" for more...


June 13, 2008  1:56 AM

SSL is Your Friend and Protector on the Web



Posted by: Ken Harthun
Cryptography, Phishing, Security, Security maxim

I hope I've given you some valuable advice in this series of posts on how to secure your computer. If so, and if you've chosen to take my advice, you’re probably careful about what you do on the web. You certainly have strong passwords for all of your logins, all of them different, and you...


May 31, 2008  2:13 AM

How to Secure Your Computer: Maxim #10



Posted by: Ken Harthun
Cryptography, Encryption, Password, Security, Security management, Security maxim

A friend of mine came up to me the other day and said, “I love your computer security maxims, but there's one thing I don’t have anything to worry about–I keep all of my passwords stored on an encrypted thumb drive.” "Well, that’s a good thing," I said. "Where do you keep your...