Using PGP or similar encryption schemes, we can encrypt a message so that the same message can be opened by two or more recipients, each using his or her own private key, without materially increasing the size of the encrypted package. Carefully explain how that can be accomplished. (Hint: the actual message is encrypted using a symmetric key.)

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

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create an interactive presentation of ms powerpoint or any other presentation software in which define the product's characteristics, benefits, why people consider it, etc.

the answer is c