Comparison of DES, Triple DES, AES, blowfish encryption for data. The encryption methods described are symmetric key block ciphers. Data Encryption Standard DES is the predecessor, encrypting data in 6. Des Decryption Vb.Net' title='3Des Decryption Vb.Net' />In this post we will see how to use Bouncy Castle Cryptographic API either as a JCA provider or as a lightweight API to develop Java J2SE projects in NetBeans or. Each block is encrypted in isolation, which is a security vulnerability. Triple DES extends the key length of DES by applying three DES operations on each block an encryption with key 0, a decryption with key 1 and an encryption with key 2. These keys may be related. DES and 3. DES are usually encountered when interfacing with legacy commercial products and services. AES is considered the successor and modern standard. AdvancedEncryptionStandard. I believe the use of Blowfish is discouraged. It is highly recommended that you do not attempt to implement your own cryptography and instead use a high level implementation such as GPG for data at rest or SSLTLS for data in transit. Here is an excellent and sobering video on encryption vulnerabilities http rdist. P8xGEw-s/Vhh0DTdv28I/AAAAAAAATGo/T7dOJ422J2U/s1600/CMD%2BVb.Net%2BSource%2BCode.gif' alt='3Des Decryption Vb.Net' title='3Des Decryption Vb.Net' />ASP. NET Quick Guide Free ASP. NET Tutorials, Reference Manual, and Quick Guide for Beginners. Learn ASP. NET starting from Environment Setup, Basic Controls. In this article you will learn collection of numerous. Net, C, ADO. NET, Web Services. Net Framework questions and answers for which a reader must normally look. Does anyone have pros and cons together for comparing these encryption algorithms Name Type Algorithm Size Strength Replaced By DES Symmetric Block cipher 64 bit 56 8 parity Very weak 3DES 3DES Symmetric Block cipher 192 bit 168 bit 24. Security Cram Sheet Proprofs. Security Cram Sheet You are here Home Schools Comptia. Security Homeedit section Security Certification Cram Guide Study Notes Hopefully, you did well on the review featured in our study guide. In this cram guide, we would like to give you some short tips on what to study for the Security exam to ensure a great score. It is organized by the same criteria that Comp. TIA organizes the actual exam and is therefore comprehensive, covering many of the specialized points that you will encounter while taking the exam. Topic 1 General Security Concepts Your ability to understand the CIA triangle Confidentiality, Integrity, and Availability will help you in many questions that are indirectly related to the triangle on the exam. Remember that confidentiality refers to the idea that information should remain only accessible to those who are meant to access it integrity is the concept that information should remain in the same form as it was originally intended i. Denial of Service. Remember that access control refers to the ability to protect the confidentiality of information through controlling a users access to that information. Remember the three types of authentication factors. Type 1 What you know Information, like passwords. Type 2 What you have Items, like lock and key or cards. Type 3 What you are Most secure Biometrics, like fingerprints. Accountability refers to the idea that a user should be accountable to actions performed under hisher name. Non repudiation is the idea that a user should not be able to repudiate that heshe is responsible for something for example, a file may say to have been edited by John, but how do we know John actually edited it. Make sure you understand Kerberos. Look back in the Security Study Guide if you do not. Here is a condensed sequence of events Client sends login information to KDC Key Distribution Center, which verifies a clients credentials and sends a request to TGS Ticket Granting Server. The TGS sends a TGT Ticket Granting Ticket to the client. Make sure you understand and can recognize each of these attacks, as you will be tested on at least two of these on the exam. SYN Flood Sending TCP packets to deny availability. ICMP Flood Sending ICMP usually ping packets to deny availability. Soundgarden B Sides Rar more. UDP Flood Sending UDP packets to deny availability. Smurf A special ICMP Flood attack that broadcasts ICMP requests. Buffer Overflow Sending a malformed packet that overflows a memory address to deny availability and possibly gain privileges destroy confidentialityintegrity. Backdoor Gain access through a secret program Trojan horse. Sniffing Read information off the network. Spoofing Hiding or disguising an address to make it appear that the requests come from another source. Man in the Middle Intercepting packets and changing the contents denies confidentiality and integrity. Replay Session key sniffed and then used. Birthday attack Probability based. Social engineering Low tech attack on people who dont understand security. Virus Propagates through user action usually email. Worm Self propagating and uses exploits. Topic 2 Communication Security Remote Access Technologies include PPP widely used for dial up TCPIP access, PPTP tunneled PPP, RADIUS UDP based, TACACS similar to radius, but TCP based and Cisco proprietary. L2. TP operates on the Data Link layer IPSec operates over Network layer and has two protocols AH and ESP. SMIME, MOSS, PEM, PGP all email security programs. Australian Marine Charts. PGP is popular and uses IDEA. Applets are programs that run in a browser Some include C, VB. Net, Java, and Active. X. S HTTP is connectionless while SSL is connection oriented SSL 3. TLS. Cookies simply store information for websites to use they are not inherently malicious. S FTP is FTP over SSH TFTP offers no authentication or encryption. Active Directory is Microsofts implementation of LDAP. Disk spanning allows a file system to be spread over multiple physical drives. WTLS is WAPs built in security system and operates over TLS. SSID is the name of a network based in infrastructure mode. WEP is weak security system for wireless LANs WEP operates on Layers 1 and 2 Physical and Data link. EAP. edit section Topic 3 Infrastructure Security Make sure you know some basic networking concepts and hardware. Cladding is the glass insulator in fiber optic cabling. STP cabling is said to be shielded against EMI, or electric interference. Also, for the Security exam, an understanding of the types of firewalls is essential. Packet filtering Works by examining headers. Circuit level gateway Maintains state information connection based. Application level gateway Examines each packet coming in for content. Proxy server Special application level gateway that ensures no direct connection between an un trusted and trusted network. ACL is the list that defines the rules that a packet filtering firewall follows. The exam tests heavily on the security zone designs or topologies. Screening router One router between the trusted and un trusted. Dual homed gateway A bastion host and router between trusted and un trusted. Screened host gateway A bastion host that can examine traffic between trusted and un trusted. Screened subnet A bastion host and DMZ zone between two routers. Its important to understand the distinctions of IDS systems. Active Finds and attempts to circumvent threats more susceptible to attacks. Passive Finds threats and alerts administrator. Network based Operates as independent network node. Host based Requires that special software be installed on each node. Knowledge based Works using signatures and known attacks. Behavior based Works by analyzing baseline v. Relaying refers to the behavior of SMTP servers that will send a message from any source should be disabled. Patches fix security issues from vendors. Anonymous services allow access without authentication. Topic 4 Basics of Cryptography The work factor of an algorithm refers to the amount of resources and time it takes for the algorithm to operate. A key is the value that can encrypt or decrypt text. Public key or asymmetric algorithms are more scalable and easier to manage than symmetric or secret key algorithms, but they require more overhead and are slower. End to End encryption refers to the idea that packets are encrypted at the source and decrypted at the destination. AES is a symmetric algorithm based on Rijndael Block Cipher. Block ciphers encrypt clear text block by block while stream ciphers encrypt text in real time. Symmetric algorithms include DES, 3. DES, AES, IDEA. Asymmetric algorithms include Diffie Hellman, RSA, El Gamal. Hashes do not allow for the decryption of cipher text. Think of a hash as a special type of cryptographic one way, one to one function. Here is a brief overview of how asymmetric or public key cryptography works. Billy wants to send Sue information. Billy encrypts the information with Sues public key, which everyone knows. Sue receives the information Bill sent and decrypts it with her private key, which only Sue knows. Sue sends Bill information back, encrypting it with his public key. Bill decrypts the information using his private key. Topic 5 Organizational Security Business Continuity Planning refers to continuing normal day to day operations after a disaster. Disaster Recovery Planning refers to fixing the problems a disaster causes.