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2. Ring signature - Wikipedia

   en.wikipedia.org/wiki/Ring_signature

   Ring signature. In cryptography, a ring signature is a type of digital signature that can be performed by any member of a set of users that each have keys. Therefore, a message signed with a ring signature is endorsed by someone in a particular set of people. One of the security properties of a ring signature is that it should be ...

3. Apollo 15 postal covers incident - Wikipedia

   en.wikipedia.org/wiki/Apollo_15_postal_covers...

   The flown-to-the-moon cover was a favor for a friend of Dick Gordon. Apollo 15 carried the cover from the Postal Service to be canceled on the surface of the Moon. The agency also sent a backup, stowed in the Command Module with another cancellation device, for use on the homeward journey if Scott did not get to postmark the lunar cover.

4. Letter (paper size) - Wikipedia

   en.wikipedia.org/wiki/Letter_(paper_size)

   In the US, paper density is usually measured in "pound per reams " (of 500 sheets). Typical Letter paper has a basis weight of paper of 20 or 24 pounds (9.1 or 10.9 kg) – the weight of 500 sheets (a ream) of 17-by-22-inch (431.8 by 558.8 mm) paper at 70 °F (21 °C) and at 50% humidity. [3] One ream of 20-pound Letter-sized paper weighs 5 ...

5. News, Politics, Sports, Mail & Latest Headlines - AOL.com

   www.aol.com/favorites

   Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach ... Our signature bookmarking site allows you to save what you love to the cloud and provides you easy access from ...

6. AOL Mail

   mail.aol.com/d?reason=invalid_cred

   We support over 70+ languages. Start for free. Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. United States passport card - Wikipedia

   en.wikipedia.org/wiki/United_States_Passport_Card

   Only one administration fee is charged for an individual applying for both a card and book at the same time.) [1] The United States passport card is an optional national identity card and a travel document issued by the U.S. federal government in the size of a credit card. [2] Like a U.S. passport book, the passport card is only issued to U.S ...