add communication

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@ -54,7 +54,15 @@ How do we ensure the psuedonyms can't be linked together? We already use cryptog
## Types of Transactions
###
Chaum highlights three areas where this technology can be utilized.
### Communication
While current cryptographic techniques protect the content of our communications, metadata about who is contacting who is still mostly unprotected.
Personal information such as home addresses, names, and SSN are collected by telecommunication companies and can be used in combination with information about who contacts who to paint a very detailed picture of a person's social web and their activities over time. Chaum calls this data "tracing information".
## Problems