Matrix Properties, Systems of Eq, and Encryption Practice

Encryption matrices must be ___.

• square. (Same number of rows and columns.)

• invertible. (Have an inverse.)

• the same size as the message matrix M.

• positive. (Contain no negatives.)

To encrypt a message matrix M using an encryption matrix E, you multiply _.

Given matrices E and M shown, encrypt the message.

• 
• 
• The matrix cannot be encrypted.

To DECRYPT a message matrix A using an encryption matrix E, you multiply _.

Given matrices E and A shown, decrypt the message. (Use your alphabet chart in Lesson 13)

Given matrices E and A shown, decrypt the message. (Use your alphabet chart in Lesson 13)

Given matrices E and A shown, decrypt the message. (Use your alphabet chart in Lesson 13)

Given matrices E and A shown, decrypt the message. (Use your alphabet chart in Lesson 13)

True or False:

A + B is the same as B + A, for any matrices A and B.

• TRUE

• FALSE

True or False:

A – B is the same as B – A, for any matrices A and B.

• TRUE

• FALSE