Public- key cryptography - Wikipedia. An unpredictable (typically large and random) number is used to begin generation of an acceptable pair of keys suitable for use by an asymmetric key algorithm. ![]() Security depends on the secrecy of the private key. After obtaining an authentic copy of each other's public keys, Alice and Bob can compute a shared secret offline. The shared secret can be used, for instance, as the key for a symmetric cipher. Public key cryptography, or asymmetric cryptography, is any cryptographic system that uses pairs of keys: public keys which may be disseminated widely, and private keys which are known only to the owner. This accomplishes two functions: authentication, which is when the public key is used to verify that a holder of the paired private key sent the message, and encryption, whereby only the holder of the paired private key can decrypt the message encrypted with the public key. In a public key encryption system, any person can encrypt a message using the public key of the receiver, but such a message can be decrypted only with the receiver's private key. ![]() ![]() For this to work it must be computationally easy for a user to generate a public and private key- pair to be used for encryption and decryption. The strength of a public key cryptography system relies on the degree of difficulty (computational impracticality) for a properly generated private key to be determined from its corresponding public key. Security then depends only on keeping the private key private, and the public key may be published without compromising security. Public key algorithms, unlike symmetric key algorithms, do not require a secure channel for the initial exchange of one (or more) secret keys between the parties. This symmetric key is then used to encrypt the rest of the potentially long message sequence. Bookmarklets Drag these to the bookmark toolbar: Encrypt Decrypt. These bookmarklets provide a quick shortcut to the encryption/decryption page and automatically. I want simple encryption and decryption of password in C#. Types Symmetric key / Private key. In symmetric-key schemes, the encryption and decryption keys are the same. Communicating parties must have the same key before they. You can quickly and securely encrypt data in SQL Server 2005+ by using the native Symmetric Keys functionality. The most common encryption algorithms symmetric key. The symmetric encryption/decryption is based on simpler algorithms and is much faster. Anyone with the corresponding public key can combine a message, a putative digital signature on it, and a known public key to verify whether the signature was valid—made by the owner of the corresponding private key. Changing the message, even replacing a single letter, will cause verification to fail: in a secure signature system, it is computationally infeasible for anyone who does not know the private key to deduce it from the public key or from any number of signatures, or to find a valid signature on any message for which a signature has not hitherto been seen. ![]() Thus the authenticity of a message can be demonstrated by the signature, provided the owner of the private key keeps the private key secret. They underpin various Internet standards, such as Transport Layer Security (TLS), S/MIME, PGP, and GPG. Some public key algorithms provide key distribution and secrecy (e. Diffie–Hellman key exchange), some provide digital signatures (e. Digital Signature Algorithm), and some provide both (e. RSA). Public key cryptography finds application in, among others, the information technology security discipline, information security. ![]() Is there a good example of how to encrypt/decrypt Image and other files with AES on Android? I'm working on a project which needs to encrypt/decrypt data but I'm not. This document specifies a process for encrypting data and representing the result in XML. The data may be arbitrary data (including an XML document), an XML element. This article is about Encryption key management, and will highlight what needs to be done to effectively store the keys to your encrypted data. Encryption and Decryption Encyclopedia Encryption Glossary AES encryption AES stands for Advanced Encryption Standard. AES is a symmetric key encryption algorithm. Cryptography and computer security have always been side interests for me. Recently, while I was reading about RSA encryption, I thought about how well I understood. This tutorial teaches how to encrypt and decrypt data while you also wants to store those encrypted strings and later on want to decrypt it while retrieving the data. Information security (IS) is concerned with all aspects of protecting electronic information assets against security threats. The message cannot be decrypted by anyone who does not possess the matching private key, who is thus presumed to be the owner of that key and the person associated with the public key. This is used in an attempt to ensure confidentiality. Digital signatures, in which a message is signed with the sender's private key and can be verified by anyone who has access to the sender's public key. This verification proves that the sender had access to the private key, and therefore is likely to be the person associated with the public key. This also ensures that the message has not been tampered with, as a signature is mathematically bound to the message it originally was made with, and verification will fail for practically any other message, no matter how similar to the original message. An analogy to public key encryption is that of a locked mail box with a mail slot. The mail slot is exposed and accessible to the public – its location (the street address) is, in essence, the public key. Anyone knowing the street address can go to the door and drop a written message through the slot. However, only the person who possesses the key can open the mailbox and read the message. An analogy for digital signatures is the sealing of an envelope with a personal wax seal. The message can be opened by anyone, but the presence of the unique seal authenticates the sender. A central problem with the use of public key cryptography is confidence/proof that a particular public key is authentic, in that it is correct and belongs to the person or entity claimed, and has not been tampered with or replaced by a malicious third party. The usual approach to this problem is to use a public key infrastructure (PKI), in which one or more third parties – known as certificate authorities – certify ownership of key pairs. PGP, in addition to being a certificate authority structure, has used a scheme generally called the . To date, no fully satisfactory solution to the . This key, which both parties kept absolutely secret, could then be used to exchange encrypted messages. A number of significant practical difficulties arise with this approach to distributing keys. In his 1. 87. 4 book The Principles of Science, William Stanley Jevons. In July 1. 99. 6, mathematician Solomon W. Golomb said: . Ellis, a British cryptographer at the UK Government Communications Headquarters (GCHQ), conceived of the possibility of . Williamson, developed what is now known as Diffie–Hellman key exchange. The scheme was also passed to the USA's National Security Agency. Only at the end of the evolution from Berners- Lee designing an open internet architecture for CERN, its adaptation and adoption for the Arpanet .. This method of key exchange, which uses exponentiation in a finite field, came to be known as Diffie–Hellman key exchange. This was the first published practical method for establishing a shared secret- key over an authenticated (but not confidential) communications channel without using a prior shared secret. The latter authors published their work in 1. RSA, from their initials. RSA uses exponentiation modulo a product of two very large primes, to encrypt and decrypt, performing both public key encryption and public key digital signature. Its security is connected to the extreme difficulty of factoring large integers, a problem for which there is no known efficient general technique. In 1. 97. 9, Michael O. Rabin published a related cryptosystem that is probably secure as long as the factorization of the public key remains difficult – it remains an assumption that RSA also enjoys this security. Since the 1. 97. 0s, a large number and variety of encryption, digital signature, key agreement, and other techniques have been developed in the field of public key cryptography. The El. Gamal cryptosystem, invented by Taher El. Gamal relies on the similar and related high level of difficulty of the discrete logarithm problem, as does the closely related DSA, which was developed at the US National Security Agency (NSA) and published by NIST as a proposed standard. The introduction of elliptic curve cryptography by Neal Koblitz and Victor Miller, independently and simultaneously in the mid- 1. Although mathematically more complex, elliptic curves provide smaller key sizes and faster operations for approximately equivalent estimated security. Typical use. Open networked environments are susceptible to a variety of communication security problems, such as man- in- the- middle attacks and spoofs. Communication security typically includes requirements that the communication must not be readable during transit (preserving confidentiality), the communication must not be modified during transit (preserving the integrity of the communication), the communication must originate from an identified party (sender authenticity), and the recipient must not be able to repudiate or deny receiving the communication. Combining public key cryptography with an Enveloped Public Key Encryption (EPKE). In other words, even if an adversary listens to an entire conversation including the key exchange, the adversary would not be able to interpret the conversation. The distinguishing technique used in public key cryptography is the use of asymmetric key algorithms, where a key used by one party to perform encryption is not the same as the key used by another in decryption. Each user has a pair of cryptographic keys – a public encryption key and a private decryption key. For example, a key pair used for digital signatures consists of a private signing key and a public verification key. The public key may be widely distributed, while the private key is known only to its proprietor. The keys are related mathematically, but the parameters are chosen so that calculating the private key from the public key is unfeasible. In contrast, symmetric key algorithms use a single secret key, which must be shared and kept private by both the sender (for encryption) and the receiver (for decryption). To use a symmetric encryption scheme, the sender and receiver must securely share a key in advance. Because symmetric key algorithms are nearly always much less computationally intensive than asymmetric ones, it is common to exchange a key using a key- exchange algorithm, then transmit data using that key and a symmetric key algorithm. PGP and the SSL/TLS family of schemes use this procedure, and are thus called hybrid cryptosystems. Security. This assumes, of course, that no flaw is discovered in the basic algorithm used. Another application in public key cryptography is the digital signature. Digital signature schemes can be used for sender authentication and non- repudiation. The sender computes a digital signature for the message to be sent, then sends the signature (together with the message) to the intended receiver. Java. Script Encryption and Decryption - Instructions. To put encrypted text in your own site. Add the decryption Java. Script code (see below)Encrypt your text on the encryption page. Type the password for the encrypted text in the Key box (be sure to remember the key!)Enter whatever you want to encrypt in the Plain Text box. Click Encrypt. Copy and paste the code in the HTML Code box into your website or blog. The Java. Script decryption code. Between the < head> and < /head> tags in the html code of your webpage, add the following.
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SMP/HT support. support of contiguous set of modes UDMA0- UDMA6 (ATA- 1. Support of numerous IDE controllers and generic ATA/ATAPI. IDE controller or motherboard. Intel SATA controller AHCI driver for Windows 7 (32-bit), Vista (32-bit), XP - ThinkPad Edge 14, Edge 15, Edge E40, Edge E50, L412, L512. Windows: Windows Vista (6.0). Atapi dvd driver free download. Download drivers for Seagate's ATAPI Tape device for Windows NT 3.5.1. Free Publisher: Seagate Technology Downloads: 9,071. ![]() You can change data transfer mode. PIO/DMA/UDMA) on the fly. Such questions come when we have. Norton. Ghost's users know). ![]() Especially topical for w. IDE. controller makes system unbootable. By the way, to solve this. Read about it. here. Note, that. the last one is Warning: filesize() . Fixed several problems with ISA- only systems. Freeze is caused by BIOS USB keyboard emulation. Legacy USB keyboar support/emulation must be disabled in BIOS. Binary size is reduced even more. Thahks to Rayer for finding exact version where. We try to fix strange problems with several ATAPI devices on some SATA/AHCI controllers. Fixed bug in DMA timing for ICH4 chips. Due to wrong programming we got assymetric transfer r/w rate. UDMA 5 - 8. 0/1. 6 Mb/s. Added handling of Exclude option. Compatible controllers and AHCI channels. Partially added handling of . ![]() ![]() Spark. Fun Wi. Fi Shield - ESP8. WRL- 1. 32. 87. 3. Based on 3. 1 ratings: Currently viewing all customer reviews. Showing results with star rating. Show All. 1 of 1 found this helpful: Getting into Io. T in One Morningabout 2 years ago. Member #7. 26. 90. I was connected to the internet and posting data within a couple of hours. Look, no internet- connected project is going to be a walk in the park, especially the first time around. When I was thinking of buying Raspberry Pi few months ago, I was also about to buy 3G router/AP. When I learned what RPi is, and I saw people trying to make AP out of. ![]() Going from the relatively simple realm of the Arduino IDE to the relatively not simple realm of networking, and then trying to cobble the two together, is a big leap. I’ve had no problems; this little shield did exactly what I hoped. Even soldering on the headers (this was my first time!) wasn’t too bad. And for $1. 5? Love it! Unreliable/Brokenlast year. Either I’m incredibly unlucky and got two duds, my Arduino Uno is broken in weird ways or this thing is just unreliable. Essentially, this shield has two states of failure: If I pull it out a little from the Arduino sockets, it blinks the blue light a bunch, and then reports that it failed to establish a connection. If I push the shield all the way in, the red LED is the only thing that lights up, and the ESP8. The board then fails to initialise. Since the second failure condition sounds an awful lot like a short circuit, I RMA’d it, but the second board I got exhibits the same behaviour. I’ve also noticed that the pads on the broken out ESP8. Arduino Uno USB connector when pushed in all the way, which might short it, but the short- circuit like behaviour also occurs even if the pads don’t touch it, so something’s weird. Either way, buyer’s beware - I’ve yet to actually successfully use this thing. ROB- 2. 46. 01. replied on July 1. Sorry to hear that. It seems odd that they would both fail in the same manner. You’re right that these pins might be shorting onto your USB port. A dab of nail polish on the USB casing, or a bit of electrical tape can help to isolate the USB housing from shields on top. I will suggest that we move those pins in the future to avoid making contact. I know you contacted our tech support team for your RMA, but maybe reach out to them again, and see if they recognize this behavior, and how to fix it. Having SPI breakout would be better for hackers. However, I liked it much. ESP8. 26. 6 2. 01 also would have done good to me. Works Great: Awesome Possibilities! No problems. Started working and learning from the connection guide. ![]() ![]() ![]() Wifi Ssid Suggestions For ChristmasThe demo code compiled and works great! I can’t say enough good things about the Spark. Fun Hookup guides. By providing those excellent examples of functionality, they allow me to envision a technically feasible path toward my goals. Using the Spark. Fun Red. ![]() Board and the 2. 4. GHz antenna (because the underground lair is so far from the router). Using with the pubsubclient libraryabout 2 years ago. Member #4. 85. 78. Wireless works fine, but? Just solder on the headers, fit it on your arduino, and you’re good to go. I would recommend buying a u. Fortunately sparkfun sells the WRL- 1. Another thing to note is that if you need SSL, the ESP8. HTTPS. Otherwise though, this product is a breeze to use, works perfectly, and all at a great price. Haven't connected to a network yetabout 2 years ago. Member #4. 01. 69. I have tried unsuccessfully now to connect to any of my wireless networks using the shield and the accompanying documentation. Every example has ended in error. ![]()
Sometimes you might creep in with some astonishing problems on your Android mobile phone and one of them is not able to connect your phone over Wi-Fi. WRL-13287: The SparkFun ESP8266 WiFi Shield is an Arduino compatible shield for the ESP8266 WiFi SoC – a leading platform for Internet of Things (IoT) or WiFi-relat. How to Improve WiFi Reception. There are few things as frustrating as a weak or faulty WiFi reception. Luckily, there are a few things you can do to improve it. Continuing from my previous blog post about Hi-Link HLK-RM04 module, I have finally received the ESP8266 Serial-to-WiFi module that I’ve been waiting for. I have tried various forms of authentication and cannot even get connected to an unsecured network. All return the error code - not a timeout. Single T. replied on August 2. The code in the Hookup guide should be operational. We have some issues with connecting to our office wifi because of router settings holding us back. When mine doesn’t connect I get a Error code as well, not a timeout. However, when attempted at home, we can get these to connect. Hardware probably fine but can't run it. It seems like the arduino must be buggy In the bo. Ard manager area. There was nothing wrong with the board and getting Ping working wasn’t too hard but if anything goes wrong there isn’t much info as to what. My workshop doesn’t have super strong Wi. Fi signal strength but I didn’t know if that was the problem. I finally set up a Kindle hotspot right next to the board and it worked. Still haven’t gotten the server sketch to work but it’s just a matter of time and debugging. But the functionality is impressive and the Arduino environment makes it easy. Member #7. 87. 40. Spark ESP8. 26. 6 Shield demo works ok. I tested signal reception in next room – okay. Problem with finicky headers. Found that it was best to insert pins just a little bit – if I pushed them all the way in got “error communicating to board.”Retired Electronic Tech... Member #7. 93. 71. That should be in every “citizen scientists” toolbox. Unreliableabout a year ago. Lewma verified purchaser. Loaded up the Shield Demo Sketch on my Arduino Uno R3. I would recommend contacting our tech support team at techsupport@sparkfun. Cant connect to Wifilast year. Member #8. 02. 86. Just wont connect to the Wifi. Magically happened once and thats it. I can’t seem to get the board to function reliably. Also on the minus side, the provided library makes the app provide housekeeping code to filter out the ESP8. IPD,0,1. 47. 0: etc.) from received data. Other than that I’m having fun with the board, and am looking forward to using it in a Lunar Clock project I’m putting together. Single T. replied on August 1. Hi. You’re right that these pins might be shorting onto your USB port. A dab of nail polish on the USB casing, or a bit of electrical tape can help to isolate the USB housing from shields on top. I will suggest that we move those pins in the future to avoid making contact. I am a medium novice at Arduino and related activities. I was able to brush up on tips for soldering so I could connect the pins without too much trouble. Getting the IP address to recognize my device, but the tutorial gave me the confidence to stick with it until it connected. I’ll be looking forward to posting data “live” with my next project. DOAabout 1. 1 months ago. Member #8. 30. 23. I’m sure this shield is nice to work with but mine was DOA. Board is pulling a huge amount of current and the ESP8. I assume the ground plan underneath the QFN package is shorting something. Intermittent IDE connection that is easily resolved if I don’t have the shield placed (in sw mode). I’ll pull the chip off at work and try to reflow it but tempted to through it in the trash. Improve your quality control! There is a hole in your quality check that allowed a dead board to be shipped to a customer. ROB- 2. 46. 01. replied on August 8, 2. Sorry to hear you’ve had issues with the board. If you contact our tech support team, they can help you to resolve any issues. Incompatibilities and Redboard flash usageabout 1. Member #5. 66. 70. I bought the ESP8. XBee system I was using on my old weather station outdoor components. The stack was going to be Red. Board - > ESP8. Weather Shield - > instruments. Unfortunately, when I loaded the ESP8. AT library and the weather station libraries I only had 3. Redboard - not enough to initiate an MQTT session to send weather data or even a raw TCP socket to send to a custom server on the local network. So, need more memory = upgrade to a Mega 2. Well, the Mega (either clones or the genuine Mega 2. ESP8. 26. 6 shield no matter what I do. To solve this problem and get my weather collection up and running I used a genuine Mega 2. Adafruit WINC1. 50. Wi. Fi breakout (SPI device), and the Spark. Fun weather shield. I then used the Adafruit MQTT library to send data to my MQTT broker that I have running on my network. So I ended up with an extra ESP8. Redboard. I’m sure I can find something to do with it, but I’m disappointed that the configuration I planned on won’t work. So minus two stars for R3 board incompatibility. If you're playing with ESP8. GET THIS SHIELD : ^)about 1. Mike Mushovic verified purchaser. This product has been a real time saver and partner in my efforts with the ESP8. Everything is broken out, easy to access and modify. The Tutorial is also GREAT and the sample code included with it makes a great jumping off point for first time or expanded development. I’ve bought four already and will be getting more. I’d give this item a full FIVE start rating if it came with the headers (why doesn’t it?) and if the antenna selection were switch selectable or the SMD resistors were the next size up for beginning solderers/hobbyists. Doesn't implement the standard Client. Pub. Sub. Client lib won't work. Member #8. 39. 09. Don’t bother trying to use this for your Io. T project – the library doesn’t implement a standard Client. I tried to use the MQTT Pub. Sub. Client library that I’ve used before with the wired Ethernet shields, but the library seems to be looking for null terminated strings, which the Client. When inserted fully the WIFI chips ran very hot and it would not function. I got the shield to function only one time by fiddling with very light insertion of the pins. SF Support sent me a replacement board, but it only acted dead all the time. I tried using two different Arduino UNOs which still function fine with other shields. I gave up on using this WIFI design and am waiting for SF support to tell me if I can return both units for a refund. Easy to use, works greatabout 5 months ago. Member #8. 75. 61. I just got this in the mail last night and had the headers soldered and the board up- and- running with the sample code in about 3. I also purchased the 2. GHz Antenna (WRL- 1. I highly recommend buying the antenna (it’s only $4. Much better than trying to use the bare bones ESP8. Member #2. 48. 48 verified purchaser. I struggled to integrate ESP8. I am pairing this up with a Spark. Fun Red. Board and even with using the examples to connect to 2 different consumer level access points I’m getting very crappy results. The shield most of the time fails to establish a connection to the Red. Ways to Improve Wi. Fi Reception. Wifi is a technology for connecting computers, usually your desktop/laptop/phone/tablet and the router. If all you need is to connect your devices with each other, the wifi router should be enough. In most cases, though, you want you devices to reach the world wide web, in which case, the router will need to be able to connect to the external Internet, which needs an Internet provider. Apps funktionieren nicht, weier Bildschirm nach App Start. FEHLERCODE: 0x. 80. Was v. Leider habe ich beim googlen nur Informationen f. Netzwerkprobleme k. Alle Win Updates sind aktualisiert. Habe dann in der Community folgendes gefunden und diesen Rat befolgt: Die Folge war, das nun der Store gar nicht mehr aufgerufen werden kann, sondern nur kurz ein blauer Bildschirm erscheint und danach automatisch der Desktop. Windows Vista Weier Bildschirm Nach Start EmAntwort; Autor Thema. Bildschirm bleibt nach windows start sehr lange schwarz; Pebro1. Team; Windows XP; Beiträge: 7095;. ![]() Nach dem Start von Vista kommt nach dem Willkommen. Vista 32 bit nach Start schwarzer Bildschirm. Ich hab bei Windows Vista den 2. Bildschirm in den. Windows Vista schwarzer Bildschirm nach. Schwarzer bildschirm nach start von windows xp. Komplett weisser Bildschirm nach dem Start. Windows Vista: Bildschirm nach Start schwarz. Folgendes Problem: Schwarzer Bildschirm nach Start, nur Mauszeiger sichtbar.Zur Info. Windows Vista: Schwarzer Bildschirm mit Mauszeiger. Weier Bildschirm Nach App Start. Alles funktionierte nach der Instalation 2 Tage lang. Hatte Windows 7 auf Windows 8 pro upgedatet. ![]() Toshiba Laptop Drivers Download for Windows 1. XP, Vista. Below is a list of our most popular Toshiba Laptop product support software drivers. To download, select the Model Name/Number of your device, then click the Download button. If you can not find the right driver for your Toshiba Laptop, enter Toshiba Laptop model into the search box below and Search our Driver Support Database. Or you can request the driver and we will find it for you. ![]()
![]() ![]() Bonjour, J'ai un Toshiba Satellite C855-1KM et je n'arrive pas à trouver le pilote du contrôleur réseau (wifi). Pouvez-vous m'aider s'il vous plaît? The Official Toshiba Support Website provides support for Satellite Pro L300-EZ1521. ![]() ![]() ![]() ![]() ![]() ![]() ![]() Online User Manuals. Wireless LAN Downloads. 3G Downloads. Free download computer hardware device driver files. Find drivers for all computer parts including Notebook, Printer drivers and all other computer parts.Search. Bonjour, j'ai déballé mon l300 hier, et comme beaucoup de monde, j'avais pas de reconnaissance réseau. Toshiba Infrastructure The test of time. Through our solutions for public infrastructure, buildings and facilities, and industrial systems, we are pursuing a. Windows IT Center - Resources for IT Professionals. To download and install e-Sword on your PC, please follow these simple steps: Click the top button that says "e-Sword Install". After a little while your browser's.Ease. US Partition Master Free - Free Partition Magic alternative and Partition Manager Freeware for Windows XP/Vista/7/8/1. Awards. From CNETWhen you add a new hard disk or SSD to your system, you must format and partition it before you can use it. The best tool for the job is a full- featured disk partition manager, which can not only format and partition drives but repartition them, too, or change the partition type when your needs change; for instance, if you should move your C drive to an SSD, you can repartition the old drive for media storage. Ease. US Partition Master Free Edition is just such a tool. Fix Most Windows Errors and Problems With Tweaking.Com Windows Repair 3.9.34 (Video) Random Photo: A Sexy Post Random Photo: The Truth About Being Married.
![]() From Tech. Republic. If you need more partitioning power than the Windows operating system's native Disk Management provides, you should take a closer look at Ease. ![]() US Partition Master. This utility offers all the standard and advanced features you'd want to have available in a disk partitioning tool, it supports Windows 7/8. From PC World. I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions. Since my last look at version 6. RAID solution within Windows) as well as merge contiguous partitions. All functions are selected and handily listed in a pane to the left of the main window so you can see what will transpire when you hit the Apply button. From Microsoft Tech. Net. Partition Master lets you chain operations together, creating a single execution plan for multiple disk events. The application has two very useful utility wizards for copying: the Partition Copy Wizard and the Disk Copy Wizard, both of these abilities can be useful when upgrading disks and systems. More Awards > > Customer Stories. Great product. Bradford Cooper . In the Microsoft Support forum there was the same problem described and they recommended Ease. US as the solution. I downloaded it and 1 minute later my 2nd disc was showing in Explorer. I have bought the Pro edition as a show of support! It was so user friendly Stephen ! I downloaded the free version of easus and it worked on my old xp program. It was so user friendly and I really appreciate your expertise. Many thanks and seasons greetings to all at Ease. USKelvyn (Jakarta Indonesia) . Again, many thanks and seasons greetings to all at Ease. US. Thanks! Thank you very much for an excellent program. Sincerely J. Balga . Thank you very much for an excellent program. Finally I managed to merge partitions on the disk. The program is great and excellent. Thanks. Say a big thank you. Elaine Limb . Have used it today and would like to say a big thank you, it worked really well, I am most impressed with this product. Thanks again you were a massive help to me. Ease. US Partition Master is an excellent tool. |
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