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2. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   A digital signature is an authentication mechanism that enables the creator of the message to attach a code that acts as a signature. The Digital Signature Algorithm (DSA), developed by the National Institute of Standards and Technology, is one of many examples of a signing algorithm.

3. Security printing - Wikipedia

   en.wikipedia.org/wiki/Security_printing

   Security printing. Security printing is the field of the printing industry that deals with the printing of items such as banknotes, cheques, passports, tamper-evident labels, security tapes, product authentication, stock certificates, postage stamps and identity cards. The main goal of security printing is to prevent forgery, tampering, or ...

4. Digital stamp - Wikipedia

   en.wikipedia.org/wiki/Digital_stamp

   A digital stamp in crafting, stamping, card making and scrapbooking is a digital image printed onto paper from the user's printer. Digital stamps come in a variety of formats, including PNG, JPG, and TIFF. Digital stamps offer many advantages over traditional rubber stamps because of their ability to be flipped, resized, rotated and easily stored.

5. You'll soon need a Real ID to travel in the U.S. Here's how ...

   www.aol.com/youll-soon-real-id-travel-212819617.html

   Flying within the U.S. will soon require an extra document that's more secure than a state-issued driver's license or ID if you don't want to lug around your passport with you.

6. Microprinting - Wikipedia

   en.wikipedia.org/wiki/Microprinting

   Microprinting is the production of recognizable patterns or characters in a printed medium at a scale that typically requires magnification to read with the naked eye. To the unaided eye, the text may appear as a solid line. Attempts to reproduce by methods of photocopy, image scanning, or pantograph typically translate as a dotted or solid ...

7. Add, edit, or disable your signature in AOL Mail

   help.aol.com/articles/add-edit-or-disable-your...

   This feature ensures all your AOL messages maintain a consistent, professional look with minimal effort. 1. Click the Settings Menu icon | select More Settings . 2. Click Writing email. 3. Click the Toggle button to enable or disable a signature for your email address. 4. Enter or edit your signature in the text box.