First Edition (version 1.0) published online on 14 March 2009 This book is a collection of my essays presenting the methods to create big and yet memorizable secrets with its key sizes beyond 128 bits till 512 bits to realize various key size requirements of information engineering applications in general and MePKC (Memorizable Public-Key Cryptography) in particular. In addition to the discussed topics, there are original and novel idea conceptions proposed as follows: (i) methods and systems to realize memorizable symmetric key the secret till resistance to quantum computer attack; (ii) methods and systems to realize memorizable public-key cryptography (MePKC); (iii) methods and systems to improve security strength of other cryptographic, information-hiding, and non-cryptographic applications of secret beyond 128 bits; (iv) method and system to harden the identification of embedded data in steganography although stego-data has been detected; (v) method and system to transfer fund electronically over a remote network using MePKC; (vi) method and system to license software electronically over a remote network using MePKC; (vii) methods and systems to authenticate human-computer and human-human communications at a local station or over a remote network using MePKC; (viii) method and system to use digital certificate with more than one asymmetric key pair for different protection periods and password throttling; (ix) method and system to use three-tier MePKC digital certificates for ladder authentication; (x) method and system to store, manage, and download voice and video calls of mobile phone and wired phone at online distributed servers; (xi) method and system of multipartite electronic commerce transactions; as well as (xii) method and system to boost up the trust level of MePKC digital certificate by using more than one certification authority (CA) and/or introducer of trust of web. Other than that, there are some imperative feature enhancements as follows: (i) hack-proof data storage using innovated DIP switch; (ii) MePKC digital timestamping scheme to prove idea originality of intellectual properties (IP); and (ii) limited first-to-invent patent filing system. Due to the relatively high research costs invested by the author, for refund, as well as for building up a fund for further maintenance, research and development, any original and novel idea conceptions from the author in this book is only free of usage for public interests, press report, private study, research, and teaching throughout the World, with the condition that proper originality citation for source references has been clearly shown. Yet for any commercial usage, prior consent has to be obtained from the author or his successor(s). For more details on the conditions to use the novel copyrighted ideas in this literary work, please refer to the websites [W1-W6] as follows: [W1] Kok-Wah LEE @ XpreeLi's website: http://www.xpreeli.com [W2] Author's copyrighted works: http://www.xpreeli.com/personal/kwlee_copyright.htm [W3] Author's exclusion list for self-defence: http://www.xpreeli.com/personal/exclusion_list.htm [W4] Copyrighted idea unit for licensing cost: http://www.xpreeli.com/personal/copyright_unit.htm [W5] Copyright leasing application (PDF): http://www.xpreeli.com/mydoc/copyright_licensing_form.pdf [W6] Copyright leasing application (DOC): http://www.xpreeli.com/mydoc/copyright_licensing_form.doc © Kok-Wah Lee @ Xpree Jinhua Li, 14 March 2009 Email (h): [email protected] Email (o): [email protected] URL (h): www.geocities.com/xpree/ URL (o): www.xpreeli.com All rights reserved E. & O. E., + E. (Errors and Omissions Exempted, plus Estimations)