Secure by design, in software engineering, means that the software has been designed from the ground up to be secure. Malicious practices are taken for granted and care is taken to minimize impact when a security vulnerability is discovered or on invalid user input. Generally, designs that work well do not rely on being secret. It is not mandatory, but proper security usually means that everyone is allowed to know and understand the design because it is secure. This has the advantage that many people are looking at the code, and this improves the odds that any flaws will be found sooner. Of course, attackers can also obtain the code, which makes it easier for them to find vulnerabilities as well. Also, it is very important that everything works with the least amount of privileges possible (principle of least privilege). For example a Web server that runs as the administrative user (root or admin) can have the privilege to remove files and users that do not belong to it. Thus, a flaw in that program could put the entire system at risk. On the other hand, a Web server that runs inside an isolated environment and only has the privileges for required network and file system functions, cannot compromise the system it runs on unless the security around it is in itself also flawed. Often the easiest way to break the security of a client/server system is not to go head on to the security mechanisms but instead to go around them. A man in the middle attack is a simple example of this, because you can use it to collect details to impersonate a user. Which is why it is important to consider encryption, hashing, and other security mechanisms in your design to ensure that information collected from a potential attacker won't allow access. Another key feature to client-server security design is general good-coding practices. For example, following a known software design structure such as client and broker can help in designing a well built structure with a solid foundation. Furthermore that if the software is modified in the future it is even more important that it follows a logical foundation of separation between the client and server. This is because if a programmer comes in and cannot clearly understand the dynamics of the program they may end up adding or changing something that can add a security flaw. Even with the best design this is always a possibility, but the better standardized the design the less chance there is of this occurring.

Car Rental Classification Code

The ACRISS Car Classification Code is a code used by many car rental companies, including Avis, Hertz, Alamo, Europa car and National, for classifying vehicles. ACRISS stands for Association of Car Rental Industry Systems and Standards. The code has four letters, each of which represents an attribute of the vehicle. First letter: Class
M = Mini
E = Economy
C = Compact
I = Intermediate
S = Standard
F = Full Size
P = Premium
L = Luxury
X = Special
Second letter: Type
B = 2 Doors
C = 2/4 Doors
D = 4 Doors
W = Wagon
V = Van (6+ passengers)
L = Limousine
S = Sport
T = Convertible
F = 4-Wheel Drive
P = Pick Up
J = All Terrain
K = Van (cargo)
X = Special
Third letter: Transmission
A = Automatic
M = Manual
Fourth letter: Air Conditioning
R = Yes
N = No wiki Car Classification Code The ACRISS Car Classification Code is a code used by many car rental companies, including Avis, Hertz, Alamo, Europcar and National, for classifying vehicles. ACRISS stands for Association of Car Rental Industry Systems and Standards. The code has four letters, each of which represents an attribute of the vehicle. First letter: Class M = Mini E = Economy C = Compact I = Intermediate S = Standard F = Full Size P = Premium L = Luxury X = Special Second letter: Type B = 2 Doors C = 2/4 Doors D = 4 Doors W = Wagon V = Van (6+ passengers) L = Limousine S = Sport T = Convertible F = 4-Wheel Drive P = Pick Up J = All Terrain K = Van (cargo) X = Special Third letter: Transmission A = Automatic M = Manual Fourth letter: Air Conditioning R = Yes N = No

Car classification is subjective since many vehicles fall into multiple categories or do not fit well into any. Not all car types are common in all countries and names for the same vehicle can differ by region. Furthermore, some descriptions may be interpreted differently in different places. Broadly speaking, there are a set of classifications which are widely understood in North America, and another set which are somewhat understood in English-speaking contexts in Europe. Some terms borrowed from non-English languages may have different meanings when used in their native language.