# How many different keys will be required to give four people the ability to encrypt and decrypt the message using a symmetric cryptography algorithm?

ONE

**Answer Explanation:** Only one key would be required for
everyone to be able to encrypt and decrypt the message. Symmetric
cryptography uses the same "shared secret" key for encrypting and
decrypting a message. A message encrypted using a symmetric
encryption algorithm can be decrypted by anyone with the key. For
this reason it is very important to ensure that the key is
protected from unauthorized use. One of the primary security issues
surrounding the use of symmetric cryptography is the method used to
transport the key to users who need it, as most forms of
communication are susceptible to eavesdropping.

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