The design for the Chinook originates from the Vertol Model 107, which was produced by Boeing Vertol in the early 1960s. The Vertol was one of the pioneer twin rotor cargo helicopters developed by Boeing. Chinooks are now used in both military and civilian roles by more than 16 nations.
SHA-1 HMAC Generation. In cryptography, a keyed-hash message authentication code (HMAC) is a specific type of message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key. It may be used to simultaneously verify both the data integrity and the authentication of a message, as with any MAC.
1 Use approved industry standard cryptographic algorithms (such as RSA with 2048 bit key) to protect the confidentiality of sensitive data. 2  Use integrity checks (such as HMACSHA1) to ensure the integrity of sensitive data.  Use a well-architected error-handling framework to ensure the availability of sensitive data.