Explanation/Reference:
Explanation:
Integrity is upheld when the assurance of the accuracy and reliability of information and systems is provided and any unauthorized modification is prevented. Hardware, software, and communication mechanisms must work in concert to maintain and process data correctly and to move data to intended destinations without unexpected alteration. The systems and network should be protected from outside interference and contamination.
The opposite of integrity is alteration.
Incorrect Answers:
A: Abstraction is not the opposite of integrity.
C: Accreditation is not the opposite of integrity.
D: Application is not the opposite of integrity.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 23

Symmetric-key algorithms are a class of algorithms for cryptography that use the same cryptographic keys for both encryption of plaintext (sender) and decryption of ciphertext (receiver). The keys may be identical, in practice, they represent a shared secret between two or more parties that can be used to maintain a private information link.
This requirement that both parties have access to the secret key is one of the main drawbacks of symmetric key encryption, in comparison to public-key encryption. This is also known as secret key encryption. In symmetric key cryptography, each end of the conversation must have the same key or they cannot decrypt the message sent to them by the other party.
Symmetric key crypto is very fast but more difficult to manage due to the need to distribute the key in a secure means to all parts needing to decrypt the data. There is no key management built within Symmetric crypto.
PKI provides CIA - Confidentiality (Through encryption) Integrity (By guaranteeing that the message hasn't change in transit) and Authentication (Non-repudiation). Symmetric key crypto provides mostly Confidentiality.
The following answers are incorrect:
-PKI - Public Key Infrastructure: This is the opposite of symmetric key crypto. Each side in PKI has their own private key and public key. What one key encrypt the other one can decrypt. You make use of the receiver public key to communicate securely with a remote user. The receiver will use their matching private key to decrypt the data.
-Diffie-Hellman: Sorry, this is an asymmetric key technique. It is used for key agreement over an insecure network such as the Internet. It allows two parties who has never met to negotiate a secret key over an insecure network while preventing Man-In-The-Middle (MITM) attacks.
-DSS - Digital Signature Standard: Sorry, this is an asymmetric key technique.
The following reference(s) was used to create this question: To learn more about this topics and 100% of the Security+ CBK, subscribe to our Holistic Computer Based Tutorial (CBT) on our Learning Management System http://en.wikipedia.org/wiki/Symmetric-key_algorithm

Black-box testing observes the system external behavior, while white-box testing is
a detailed exam of a logical path, checking the possible conditions.
Source: Information Systems Audit and Control Association, Certified Information Systems Auditor
2002 review manual, chapter 6: Business Application System Development, Acquisition,
Implementation and Maintenance (page 299).