Starfleet security codes and data access

The ships and bases of Starfleet are fitted with very advanced computer systems which can store masses of information and perform many tasks. Access to these computers, and to the data they contain is strictly regulated, so that only authorised personnel can perform certain tasks, or access certain data files.
== Security codes for use in transmission ==
The simplest means of keeping a communication secret is by using some sort of pre-agreed code essentially an artificial language that conceals the true information of the message. Starfleet encodes high-priority messages and has coded communications channels for (relatively) secure communications through subspace. Species like the Ferengi routinely encode all their communications. In the age of isolinear computer processors, codes can be very complex. Fortunately, with the help of the same computers (and universal translation software) it is still possible to break most codes, given time.
=== Security codes ===
Starfleet maintains a variety of security codes for use during both peacetime and wartime. These codes are arranged by priority from 1 to 50. The function of the individual codes is summarised below.
==== SSC's 1-29 ====
SSC 1-10 	Used for normal peacetime transmissions of varying priorities, with routine transmissions between commercial planetary centres receiving a priority dispatch of 1 through 5, and levels 6 through 10 being used for Starfleet communications.
SSC 11-20	Used in conditions of hostilities between the Federation and a foreign power. These priorities are used to transmit orders regarding the disposition of vessels and ground troops, the relocation of civilian personnel, the assigning of Starfleet resources to different commands, operations orders for these commands and specific operations orders.
SSC 21-29	Used by the Federation Diplomatic Corps
==== SSC's 30-39 ====
Starfleet codes 30-39 specify conditions of emergency, with variable priority levels given to specific problems or crisis conditions during peacetime operations.
SSC 30 	Indicates an emergency condition involving a planetary disaster or other unspecified emergency. Use of this code means that the sending station is not able to adequately respond to the emergency and requires immediate help at the scene.
SSC 31 	Indicates a medical emergency.
SSC 32 	Indicates a planetary crisis of natural origin
SSC 33 	Indicates a bio-medical emergency requiring immediate evacuation of personnel.
SSC 34 	Indicates a bio-medical emergency requiring immediate quarantine.
SSC 35 	Indiciates an ecological disaster or similar planetary crisis
SSC's 36-38	Indicates a crisis of unknown origin that require immediate evacuation of a large segment of the planet's population.
SSC 39 	Indicates an attack by unknown agents on Federation personnel or on civilian installations or residences.
==== SSC's 40-47 ====
Starfleet codes 40-47 indicate classified material and restrict dissemination of that material.
SSC 40	Communications are directed at the specific starship or starbase's chief science officer, for disclosure to ship or base command staff only.
SSC 41	Communications are directed at the specific starship or starbase's chief science officer, for disclosure to the senior officer present only.
SSC 42	Communications are directed at the specific starship or starbase's chief medical officer, for disclosure to the ship or base command staff only.
SSC 43	Communications are directed at the specific starship or starbase's chief science officer, for disclosure to the senior officer present only.
SSC 44	Communications are directed at a specific starship or starbase Chief of Security, for disclosure to ship or base command staff only.
SSC 45	Communications are directed at a specific starship or starbase Chief of Security, for disclosure to the senior officer present only.
SSC 46	Communications are directed to the Commanding Officer of a starship or starbase, for disclosure to ship or base command staff only.
SSC 47	Communications are directed to the Commanding Officer of a starship or starbase. They are not to be disclosed to ship or base command staff, and no acknowledgement or log entry of the communication is to be made.
=== SSC's 48-50 ===
Starfleet codes 48-50 indicate high-level orgiins of the communication, and are restricted to specific individuals.
SSC 48	Communications reserved for the Chief-in-Command of Starfleet
SSC 49	Communications reserved for members of the Federation Council or their designated represenatives.
SSC 50	Communications reserved for the President of the Federation.
== Access codes ==
=== Departmental access codes ===
Departmental Access Codes are general codes for use by members of a ship's department. Such a code might be used to access log entries or other routine files and programmes, or to issue orders to the computer. These codes consist of the ship's department, a Greek letter, and a numerical code. The higher the Greek letter in the alphabet, the greater the access. High-level access may require voiceprint confirmation, a Personal Access Code or authorisation from a superior officer. An example of a Departmental Access Code might be: Engineering Access Code: Gamma three one four two.
=== Personal access code ===
Personal Access Codes identify the person accessing a particular file or programme, or issuing an order. They are given in a similar format to Departmental Access Codes, substituting the person's surname for the department name. All Personal Access Codes are voiceprint confirmed, and higher level access may require handprint or retinal scans for confirmation. An example of a Personal Access Code might be: Access Code: Perrini Delta five one two seven.
== Security clearance ratings ==
Access to all Starfleet computer systems is highly regulated and divided into the following ratings:
Alpha-Two	Unlimited access to all records, systems, commands, and computers.
Alpha-One	Unlimited access to all records, systems, commands, and computers. No access to localized command functions.
Beta-Two 	Unlimited access to all records, systems, and computers. Limited access to command functions (except if stated otherwise by commanding officer).
Beta-One 	Unlimited access to all ship's records, and computers. Limited access to command functions (except if stated otherwise by Commanding Officer). Access to ship systems is limited to duty related functions.
Delta-Two	Limited access to all ship's records, systems, commands and computers. Access Limited to duty related functions.
Delta-One	Limited access to all ship's records, and computers. Access limited to job related functions.
Different officers on a starfleet vessel, have varying levels of security access, depending on their level of authority or their duties. The following common positions, have been assigned standard ratings of security access. The final decision on an officer's rating of security access, however, is decided by that officer's Commanding Officer.
The Commanding Officer reserves the privilege of permitting limited access to any unspecified section of the ship to any personnel whose functions, in the eyes of the CO, require it.
== Data access levels ==
Access to all Starfleet data is highly regulated. A standard set of access levels have been programmed into the starboard and engineering computer cores of all ships in order to stop any undesired access to confidential data.
The access levels are as follows:
* Level 5: Unlimited access to all classified, secret, top-secret, ultra-secret Starfleet or Federation documents and records.
* Level 4: Limited access to all classified, secret, top-secret Starfleet or Federation documents and records. Access is limited on a 'need to know' basis.
* Level 3: Limited access to all classified and secret Starfleet or Federation documents and records. Access is limited on a 'need to know' basis.
* Level 2: Limited access to all Starfleet or Federation documents and records. Access is limited on a 'need to know' basis.
* Level 1: Limited access to Starfleet or Federation documents and records. Access is limited to job related elements.