Security

noun, plural securities.
1.
freedom from danger, risk, etc.; safety.
2.
freedom from care, anxiety, or doubt; well-founded confidence.
3.
something that secures or makes safe; protection; defense.
4.
freedom from financial cares or from want:
The insurance policy gave the family security.
5.
precautions taken to guard against crime, attack, sabotage, espionage, etc.: claims that security was lax at the embassy;
the importance of computer security to prevent hackers from gaining access.
6.
a department or organization responsible for protection or safety:
He called security when he spotted the intruder.
7.
protection or precautions taken against escape; custody:
The dangerous criminal was placed under maximum security.
8.
an assurance; guarantee.
9.
Law.

something given or deposited as surety for the fulfillment of a promise or an obligation, the payment of a debt, etc.
one who becomes surety for another.

10.
an evidence of debt or of property, as a bond or a certificate of stock.
11.
Usually, securities. stocks and bonds.
12.
Archaic. overconfidence; cockiness.
adjective
13.
of, relating to, or serving as security:
The company has instituted stricter security measures.
noun (pl) -ties
1.
the state of being secure
2.
assured freedom from poverty or want: he needs the security of a permanent job
3.
a person or thing that secures, guarantees, etc
4.
precautions taken to ensure against theft, espionage, etc: the security in the government offices was not very good
5.
(often pl)

a certificate of creditorship or property carrying the right to receive interest or dividend, such as shares or bonds
the financial asset represented by such a certificate

6.
the specific asset that a creditor can claim title to in the event of default on an obligation
7.
something given or pledged to secure the fulfilment of a promise or obligation
8.
a person who undertakes to fulfil another person’s obligation
9.
the protection of data to ensure that only authorized personnel have access to computer files
10.
(archaic) carelessness or overconfidence
security
Protection against unauthorized access to, or alteration of, information and system resources including CPUs, storage devices and programs.
Security includes:
* confidentiality – preventing unauthorized access; integrity – preventing or detecting unauthorized modification of information.
* authentication – determining whether a user is who they claim to be.
* access control – ensuring that users can access the resources, and only the resources, that they are authorised to.
* nonrepudiation – proof that a message came from a certain source.
* availability – ensuring that a system is operational and accessible to authorised users despite hardware or software failures or attack.
* privacy – allowing people to know and control how information is collected about them and how it is used.
Security can also be considered in the following terms:
* physical security – who can touch the system to operate or modify it, protection against the physical environment – heat, earthquake, etc.
* operational/procedural security – who is authorised to do or responsible for doing what and when, who can authorise others to do what and who has to report what to who.
* personnel security – hiring employees, background screening, training, security briefings, monitoring and handling departures.
* System security – User access and authentication controls, assignment of privilege, maintaining file and filesystem integrity, backup, monitoring processes, log-keeping, and auditing.
* network security – protecting network and telecommunications equipment, protecting network servers and transmissions, combatting eavesdropping, controlling access from untrusted networks, firewalls, and intrusion detection.
Encryption is one important technique used to improve data security.
OWASP is the free and open application security community.
(2007-10-05)
In addition to the idiom beginning with security