To understand the difference between cracking a single password and a set of them, consider a file with users and their hashed passwords. Say the file is unsalted. Then an attacker could pick a string, call it attempt[0], and then compute hash(attempt[0]). A user whose hash stored in the file is hash(attempt[0]) may or may not have password attempt[0]. However, even if attempt[0] is not the user's actual password, it will be accepted as if it were, because the system can only check passwords by computing the hash of the password entered and comparing it to the hash stored in the file. Thus, each match cracks a user password, and the chance of a match rises with the number of passwords in the file. In contrast, if salts are used, the attacker would have to compute hash(attempt[0] salt[a]), compare against entry A, then hash(attempt[0] salt[b]), compare against entry B, and so on. This prevents any one attempt from cracking multiple passwords, given that salt re-use is avoided.[9]
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Salts also combat the use of precomputed tables for cracking passwords.[10] Such a table might simply map common passwords to their hashes, or it might do something more complex, like store the start and end points of a set of precomputed hash chains. In either case, salting can defend against the use of precomputed tables by lengthening hashes and having them draw from larger character sets, making it less likely that the table covers the resulting hashes. In particular, a precomputed table would need to cover the string [salt + hash] rather than simply [hash].
It is common for a web application to store in a database the hash value of a user's password. Without a salt, a successful SQL injection attack may yield easily crackable passwords. Because many users re-use passwords for multiple sites, the use of a salt is an important component of overall web application security.[14] Some additional references for using a salt to secure password hashes in specific languages or libraries (PHP, the .NET libraries, etc.) can be found in the external links section below.
On January 6, 2011, a federal grand jury returned a single count indictment against Chapman for distribution of crack cocaine in violation of 21 U.S.C. 841(a)(1). On December 15, 2011, a federal grand jury returned an additional indictment against Chapman charging him with four counts of distributing heroin in violation of 21 U.S.C. 841(a)(1). The charges were consolidated into one proceeding.
On May 5, 2014, Chapman proceeded to trial. All of the recordings were admitted into evidence. The government established a proper foundation for each individual recording. Regarding the November 2, 2010, recording, an FBI special agent who worked on the case testified that he activated the Hawk recording device on November 2, 2010, as well as listened to the real-time crack cocaine transaction as it occurred over the transmitter. The agent similarly deactivated the Hawk recording device when Baggett returned with the crack cocaine, and downloaded the recording onto the DVD. He also testified that the Hawk recording device was working properly that day. He listened to the recording after it was downloaded onto the DVD, and found that the recording was a true and accurate depiction of the conversation he heard. After verifying the recording, he initialed the DVD. That DVD, with the agent's initials, was introduced at trial.
In this case, the evidence presented at trial was sufficient to establish that Chapman was not induced by the government to commit the heroin and crack cocaine transactions. Chapman claims that Baggett relied on their friendship to convince him to sell him heroin and crack cocaine. But, the recordings do not demonstrate any persuasion other than a basic inquiry into the price and quantity Chapman was willing to accept. The evidence presented at trial sufficiently established that there was no inducement, and that Chapman was predisposed to engage in drug transactions.
In a 1998 article in the industry literature, a writer made the claim that 56-bit keys did not provide as adequate protection for DES at that time as they did in 1975 because computers were 1000 times faster in 1998 than in 1975. Therefore, the writer went on, we needed 56,000-bit keys in 1998 instead of 56-bit keys to provide adequate protection. The conclusion was then drawn that because 56,000-bit keys are infeasible (true), we should accept the fact that we have to live with weak cryptography (false!). The major error here is that the writer did not take into account that the number of possible key values double whenever a single bit is added to the key length; thus, a 57-bit key has twice as many values as a 56-bit key (because 257 is two times 256). In fact, a 66-bit key would have 1024 times more values than a 56-bit key.
In cryptography, size does matter. The larger the key, the harder it is to crack a block of encrypted data. The reason that large keys offer more protection is almost obvious; computers have made it easier to attack ciphertext by using brute force methods rather than by attacking the mathematics (which are generally well-known anyway). With a brute force attack, the attacker merely generates every possible key and applies it to the ciphertext. Any resulting plaintext that makes sense offers a candidate for a legitimate key. This was the basis, of course, of the EFF's attack on DES.
In March 2016, the SSL DROWN (Decrypting RSA with Obsolete and Weakened eNcryption) attack was announced. DROWN works by exploiting the presence of SSLv2 to crack encrypted communications and steal information from Web servers, email servers, or VPN sessions. You might have read above that SSLv2 fell out of use by the early 2000s and was formally deprecated in 2011. This is true. But backward compatibility often causes old software to remain dormant and it seems that up to one-third of all HTTPS sites at the time were vulnerable to DROWN because SSLv2 had not been removed or disabled.
Kolab Now: Web-based secure e-mail service provider although it does not perform server-side e-mail encryption; they recommend that users employ a true end-to-end e-mail encryption solution. Data is stored on servers exclusively located in Switzerland and complies with the strict privacy laws of that country.
Phatty ! thank you oh so true ,I got most of the movies for my kid for free from our local video store just for being a good Customer , As for Walmart and with all due respect in 56 years never been in one and never missed them either, they are only a company that promote a form of slavery by looking at the cheaper end of the bargain , this aside they have simply sold out the USA to the Communist Chinese which made no concession on Human right , they will most likely take this post down hopefully you will read it in time . You might want to check out other retailers , if they respect their Employees they will respect you .
The old adage, the customer is always right, should be rephrased to the customer is always correct. The true nature of customer relations is NOT letting the out-of-line customer get to the staff. Following are comments actually heard in restaurants: each and every one should be responded to with a smile and a compliant response:
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Passwords are easily cracked by hackers, particularly if you don't use sound password-creation practices. The best passwords contain uppercase and lowercase letters, numbers, and special characters. You should also avoid using easily guessed words or alphanumeric combinations, such as the names of children or pets, birth dates, addresses, and similar information that can be easily guessed by someone looking at your Facebook profile or through a Google search. "The shorter and less complex your password is, the quicker it is for cybercriminals to come up with the correct combination of characters in your password." suggests the CSA Alliance. Twitter: @CSAsingapore
It's true that nothing is ever really deleted permanently from a computing device; hackers and technologically savvy criminals (and, of course, the FBI) are often able to recover information from hard drives if they haven't been properly disposed of. "There are a variety of methods for permanently erasing data from your devices (also called sanitizing). Because methods of sanitization vary according to device, it is important to use the method that applies to that particular device. Before sanitizing a device, consider backing up your data. Saving your data to another device or a second location (e.g., an external hard drive or the cloud) can help you recover your data if you accidentally erase information you had not intended to or if your device is stolen (this can also help you identify exactly what information a thief may have been able to access). Options for digital storage include cloud data services, CDs, DVDs, and removable flash drives or removable hard drives (see Using Caution with USB Drives for more information).," the Cybersecurity & Infrastructure Security Agency says. Twitter: @CISAgov
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