a screen handling program to provide a flashing message.
You will have to design a screen layout for where messages
are placed on the screen. You will also have to consider
when to delay the program in order to give the user time
to read the messages. That is, the program will use the
curses library, signals and the sleep function.
This standard describes a keyed-hash message authentication code (HMAC), a
mechanism for message authentication using cryptographic hash functions. HMAC can
be used with any iterative Approved cryptographic hash function, in combination with a
shared secret key. The cryptographic strength of HMAC depends on the properties of the
underlying hash function. The HMAC specification in this standard is a generalization of
Internet RFC 2104, HMAC, Keyed-Hashing for Message Authentication, and ANSI
X9.71, Keyed Hash Message Authentication Code.
