Identity, trust, and their role in modern applications

In the software world, identity is the mapping of a person, place, or thing in a verifiable manner to a software resource. Whenever you interact with nearly anything on the internet, you are dealing with identities:

• Facebook identity
• Email address
• Login name and password for a website

Everyone has multiple identities—multiple ways that people know who you are and interact with you in the virtual world. Here are a few of my identities:

• Twitter: @leeatchison
• LinkedIn: leeatchison
• Email address: lee###@####.com
• Phone number: (360) ###-####

Each of these is a different way of identifying me to my friends, family, co-workers, partners, and vendors. You deal with identities all the time. Identities can represent more than people. Everything you interact with in the real world that has a presence in the virtual world has to deal with identity and identity management:

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