![How can I use a MD5 or SHA1 checksum to verify a downloaded file?](https://tech90.com/wp-content/uploads/2014/08/Internet-Security2.jpg)
Here are the Archived Posts from :
![How can I use a MD5 or SHA1 checksum to verify a downloaded file?](https://tech90.com/wp-content/uploads/2014/08/Internet-Security2.jpg)
![What is an MD5 or SHA1 checksum?](https://tech90.com/wp-content/uploads/2014/08/EncryptionLock-800x675.jpg)
What is an MD5 or SHA1 checksum?
A: A good number of websites, especially those that provide large software downloads like Apple and Microsoft, have begun providing what looks like a long string of random numbers and letters with the title of either MD5 or SHA1. MD5 (Message Digest rev. 5) and SHA1... read more![Cindy B.](https://tech90.com/wp-content/uploads/2013/03/ChatBubble-1024x675.png)
Cindy B.
I have worked with many IT techs over the years at various jobs and I can say without a doubt you are the best one I’ve ever known! (and that includes my brother!!!). Cindy B. Los Angeles, CA read more![Hollywood WordPress Presentation – An Ecommerce Primer with WooCommerce and You!](https://tech90.com/wp-content/uploads/2014/01/wp-dark-hi-1440x900-1080x675.png)
Hollywood WordPress Presentation – An Ecommerce Primer with WooCommerce and You!
Here is the slideshow I presented last night at the Hollywood WordPress Meetup at WeWork in Hollywood. Thanks to everyone for joining us for a great evening! CLICK HERE to download a PDF of this presentation. read more![Cindy B.](https://tech90.com/wp-content/uploads/2013/03/ChatBubble-1024x675.png)
Dennis M. – Los Angeles, CA
Greg Madore has been my concierge tech support for about 4 years. During that time he also helped my wife, an artist who has limited experience with technology. Having worked with high-tech companies since 1995, I have known a lot of people who do tech support. Greg... read moreHow can I find and replace addresses in Apple Mail and Address Book?
A: Like many of you reading this, I hate doing repetitive work. Yes, there is a way to do this, but it is not built into Apple Mail or Address Book. Like many things in Mac OS X, the underpinnings of the Mac OS X Address Book.app (or “Contacts.app” as it... read more![Cindy B.](https://tech90.com/wp-content/uploads/2013/03/ChatBubble-1024x675.png)
What can I say but thank you.
Dear Greg, What can I say but thank you. I know your business is to provide a service to your customers when problems arise with our computers and their support hardware and software. I want you to know how much your are appreciated with your approach and resolution... read more![Cindy B.](https://tech90.com/wp-content/uploads/2013/03/ChatBubble-1024x675.png)