Computer Security

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The five levels of physical security typically include deterrence, detection, delay, response, and recovery. Deterrence aims to prevent unauthorized access through measures like signage and barriers. Detection involves monitoring systems such as alarms and cameras to identify breaches. Delay provides time for a response through physical barriers, while response focuses on the actions taken when a security breach occurs, and recovery is about restoring normal operations post-incident.

Instead of using passwords, use passphrases. Passwords longer than twenty characters become harder for hackers to guess, and they take too long for a hacker to brute force. Upwards of thirty characters would take years to crack - the passphrase "ThisPasswordIsVeryDifficultToCrack" would take years to crack, but it's obvious. Trying a passphrase such as "HorseDogLlamaChickenOneHundredAndSixtyFourBlue" is not as difficult to remember as "£hwne&n8HG(^$J" but is just as secure.

it means th image varified forensically :)

The address line must have between 8-30 letters/numbers/symbols.

They will be able to see that it exists, but they will not be able to access it unless they know the decryption password or do a "brute-force" attack on it, by having a program test every possible password.

Lack of securuity is unexpected pregnancies, like you (Tom Wilson)

This is an alpha-numeric code which in generated based on the data which has been processed. Any specific Checksum code can only be generated from one specific file or program.

The purpose of a checksum code is the allow you to make sure that a file has not been tampered with or corrupted. These codes are especially used for downloadable programs. A checksum code is sometimes provided, so when the used downloads the program, they can verify that it has not been infected or tampered with, but that they do have the original, unedited version.

The diffie hellman key exchange uses prime numbers to generate an asymmetric key pair which is used to create a secure channel over which a privet symmetric key can be sent.

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"Private key" in the context of cryptography refers to the the key generated for an asymmetric encryption algorithm which is retained by the owner while the companion "public key" is published for others to utilize for secure communications or authentication. The "private key" is not shared with anyone.

A "secret key" in the context of cryptography refers to the single key generated for use in a symmetric encryption algorithm which is only shared between those between whom secure communication is desired. It is kept secret from all others. The secret key must be transmitted to or shared with all parties by a method outside the communications link it is intended to secure.

If your computer is properly configured from a security standpoint, you may be able to download the installation file but not run it. The installation of the IRC client will require administrator privileges because it changes computer settings and opens ports for communications. Because IRC connections are usually unencrypted and typically span long time periods, they are an attractive target for hackers. Because of this, careful security policy is necessary to ensure that an IRC network is not susceptible to an attack such as an IRC takeover war. IRC can also be used for file sharing, so secure networks will block most or all IRC traffic to prevent exfiltration of sensitive information - which is another reason they should prevent non-administrators from installing IRC clients on their machines. Even if you already have an IRC client on your computer, if you connect it to a network that enforces blocking of IRC traffic you still will not be able to communicate via IRC over that network.

to re-protect our data and to save from key tampering (man in middle attack)

Public Key Cryptography is a method of secure communication. It involves the creation of both a public and a private key. When sending a message, the sender encrypts the message with the recipients public key. After receiving the message, the recipient may then decode the message with his/her associated private key.

One area that public key cryptography is used in is SSL / TLS (Secure Socket Layer). An example of an SSL library is the CyaSSL Embedded SSL Library. CyaSSL provides several public key cryptography options, including RSA, DSS, DH, and NTRU.

In addition to SSL, Public Key Cryptography is used in a large variety of techniques, algorithms, and protocols including:

Diffie-Hellman key exchange protocol

RSA Encryption Algorithm

Cramer-Shoup cryptosystem

NTRUEncrypt cryptosystem

GPG, OpenPGP

Internet Key Exchange

PGP

The public key concerning the CAC refers to the authorized key that is open to all the concerned people. The encryption procedure ranges according to the key.

That depends on whether you use a symmetric (shared key) or asymmetric (public/private key pair) algorithm.

If you use a symmetric key, it means both people have the same key which has been pre-shared via some secure means. In that case, only one key is required; both parties in the communication use the same key to encrypt and decrypt all messages.

If you use an asymmetric key algorithm, it takes at least 4 keys total: when sending a message each user will encrypt their message with the public key of the recipient (that accounts for two of the keys). Each recipient must then use their private key to decrypt the messages they receive (which accounts for the other two required keys).

In addition to buying and selling securities, brokers can advise and educate their clients on investments, saving for retirement, and tolerance for risk. Overall, brokers spend a great deal of time marketing their services and products