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NEW QUESTION: 1
Which of the following statements pertaining to stream ciphers is TRUE?
A. A stream cipher is not appropriate for hardware-based encryption.
B. A stream cipher is slower than a block cipher.
C. A stream cipher generates what is called a keystream.
D. A stream cipher is a type of asymmetric encryption algorithm.
Answer: C
Explanation:
Explanation/Reference:
Explanation:
A stream cipher is a symmetric key cipher where plaintext digits are combined with a pseudorandom cipher digit stream (keystream). In a stream cipher each plaintext digit is encrypted one at a time with the corresponding digit of the keystream, to give a digit of the ciphertext stream. Since encryption of each digit is dependent on the current state of the cipher, so it is also known as state cipher. In practice, a digit is typically a bit and the combining operation an exclusive-or (XOR).
The pseudorandom keystream is typically generated serially from a random seed value using digital shift registers. The seed value serves as the cryptographic key for decrypting the ciphertext stream.
Stream ciphers typically execute at a higher speed than block ciphers and have lower hardware complexity. However, stream ciphers can be susceptible to serious security problems if used incorrectly; in particular, the same starting state (seed) must never be used twice.
Incorrect Answers:
A: A stream cipher is not a type of asymmetric encryption algorithm; it is a symmetric key cipher.
C: A stream cipher is not slower than a block cipher; it is faster.
D: Stream ciphers require a lot of randomness and encrypt individual bits at a time. This requires more processing power than block ciphers require, which is why stream ciphers are better suited to be implemented at the hardware level.
References:
https://en.wikipedia.org/wiki/Stream_cipher
NEW QUESTION: 2
Can be seen as a special NAS file server, mainly for storing, sharing, and data transmission block:
A. False
B. True
Answer: A
NEW QUESTION: 3
You execute the following commands to audit database activities:
SQL > ALTER SYSTEM SET AUDIT_TRIAL=DB, EXTENDED SCOPE=SPFILE;
SQL > AUDIT SELECT TABLE, INSERT TABLE, DELETE TABLE BY JOHN By SESSION WHENEVER SUCCESSFUL; Which statement is true about the audit record that generated when auditing after instance restarts?
A. One audit record is created for the whole session if JOHN successfully executes a select command, and contains the SQL text and bind variables used.
B. One audit record is created for the whole session if john successfully executes a SELECT, INSERT, or DELETE command on a table, and contains the execution plan, SQL text, and bind variables used.
C. One audit record is created for every successful execution of a SELECT, INSERT OR DELETE command on a table, and contains the SQL text for the SQL Statements.
D. One audit record is created for the whole session if john successfully executes a SELECT, INSERT, or DELETE command, and contains the execution plan for the SQL statements.
E. One audit record is created for every successful execution of a SELECT, INSERT OR DELETE command, and contains the execution plan for the SQL statements.
Answer: C
Explanation:
Note:
* BY SESSION
In earlier releases, BY SESSION caused the database to write a single record for all SQL statements or operations of the same type executed on the same schema objects in the same session. Beginning with this release (11g) of Oracle Database, both BY SESSION and BY ACCESS cause Oracle Database to write one audit record for each audited statement and operation.
* BY ACCESS
Specify BY ACCESS if you want Oracle Database to write one record for each audited statement and operation.
Note:
If you specify either a SQL statement shortcut or a system privilege that audits a data definition language (DDL) statement, then the database always audits by access. In all other cases, the database honors the BY SESSION or BY ACCESS specification.
* For each audited operation, Oracle Database produces an audit record containing this information:
/ The user performing the operation
/ The type of operation
/ The object involved in the operation
/ The date and time of the operation
References: