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16 Cards in this Set
- Front
- Back
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Give an example of an Identity
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A passport is an identity
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Linux command: whoami what does it return?
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username
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Linux command: groups what does it return?
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users video vboxusers
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Linux command: what does id return?
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uid=1000(cliffe) gid=100(users)
groups=100(users),33(video),112(vboxusers) |
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root has a UID of
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0
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Authentication verifies an?
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Identity
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Security Terminology: What is a subject?
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An active entity within the system that
can attempt to access objects |
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Security Terminology: What is a Object
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A resource, such as a file
● When a process accesses a file, the program is the subject, and the file is the object |
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In general authentication consists of the following:
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● Obtaining information from an external entity
● Analysing the information ● Determining if the presented information confirms the entity's identity |
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Cryptographic one way hash functions work by:
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● A deterministic procedure
● Input an arbitrary block of data ● Produces a fixed-size string |
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In computing, authentication binds what?
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an identity with a subject, so that security decisions can be made based on its identity
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Give an example of a One way hashing tool in linux
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shasum
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Common functions MD5,
who was it made by what is the hash value has it been broken |
Designed by Ronald Rivest
128-bit hash value yes collisions |
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Common functions SHA-1
who was it made by what is the hash value has it been broken |
Designed by the USA NSA
160-bit hash value No successful attacks, but theoretical hints that it may be broken soon |
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Common functions SHA-2
who was it made by what is the hash value has it been broken |
Designed by the USA NSA
A set of hash functions: SHA-224, SHA-256, SHA-384, SHA-512, with various output lengths Currently thought of as very strong |
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Common functions SHA-3
who was it made by what is the hash value has it been broken |
NIST hash function competition currently
running |
