Wep Key 128 Bit Generator
Contents
A 128-bit WEP key is usually entered as a string of 26 hexadecimal characters. 26 digits of 4 bits each gives 104 bits; adding the 24-bit IV produces the complete 128-bit WEP key (4 bits × 26 + 24 bits IV = 128 bits of WEP key). Most devices also allow the user to enter it as 13 ASCII characters (8 bits × 13 + 24 bits IV = 128 bits of WEP key).
Introduction
How do I set up 128-Bit WEP Wireless Security on a Cisco Small Business VoIP Router?
Related Information
Introduction
Download WEP key Generator - Simplistic piece of software that helps you generate valid WEP keys (64-, 128-, 152- and 256-bit keys) in order to secure your wireless connections. To generate a key based on a custom size, enter your size into either the custom size box, and its HEX or ASCII equivalent will be generated for you automatically in the result box. The WEP/WPA Key Generator supports 64 bit & 128 bit, WEP keys, and 64 bit, 160 bit, 504 bit, WPA keys for maximum security. WEP Key Generator allows you to convert a passphrase into WEP keys used by many wireless routers. It generates 40 / 60 / 104 / 128 bit WEP keys for use with many popular routers, including Netgear, Linksys, D-Link, Apple, DD-WRT, Tomato, and many more.Simply enter your passphrase and use provided keys. Generates 64 and 128 bit WEP keys from passcodes. Does not require an internet connection. Reverse 64 bit to passcode is a work in process.
This article is one in a series to assist in the setup, troubleshooting, and maintenance of Cisco Small Business products.
Q. How do I set up 128-Bit WEP Wireless Security on a Cisco Small Business VoIP Router?
A.Wired Equivalent Privacy (WEP) is a 64-bit key with 10 hexadecimal digits or a 128-bit WEP key with 26 hexadecimal digits. This encryption will prevent other users from connecting to a wireless network using your own WEP key. It will also protect your wireless transmissions/communications from being accessed or received by other users.
In order to set up WEP Wireless Security on your Cisco Small Business router, complete these steps:
Set up the VoIP Router to Use WEP
Wireless > Wireless Security. Step 4: Step 6: Note: Create a password that is unique for your network and is a combination of numbers and letters up to 16 characters. Every time this page is displayed, our server generates a unique set of custom, high quality, cryptographic-strength password strings which are safe for you to use: What makes these perfect and safe? Also, because this page will only allow itself to be displayed over a snoop-proof and proxy-proof high-security SSL connection, and it is marked as having expired back in 1999, this page which was custom generated just now for you will not be cached or visible to anyone else. Therefore, these password strings are just for you. No one else can ever see them or get them. You may safely take these strings as they are, or use chunks from several to build your own if you prefer, or do whatever you want with them. Each set displayed are totally, uniquely yours — forever. The 'Application Notes' section below discusses various aspects of using these random passwords for locking down wireless WEP and WPA networks, for use as VPN shared secrets, as well as for other purposes. The 'Techie Details' section at the end describes exactly how these super-strong maximum-entropy passwords are generated (to satisfy the uber-geek inside you). A note about 'random' and 'pseudo-random' terminology: There are ways to generate absolutely random numbers, but computer algorithms cannot be used for that, since, by definition, no deterministic mathematical algorithm can generate a random result. Electrical and mechanical noise found in chaotic physical systems can be tapped and used as a source of true randomness, but this is much more than is needed for our purposes here. High quality algorithms are sufficient. The deterministic binary noise generated by my server, which is then converted into various displayable formats, is derived from the highest quality mathematical pseudo-random algorithms known. In other words, these password strings are as random as anything non-random can be. This page's password 'raw material': 64 hex characters = 256 binary bits: Using fewer hex characters for WEP encryption: WEP key strength (key length) is sometimes confusing because, although there are only two widely accepted standard lengths, 40-bit and 104-bit, those lengths are sometimes confused by adding the 24-bit IV (initialization vector) counter to the length, resulting in 64-bit and 128-bit total key lengths. However, the user only ever specifies a key of either 40 or 104 binary bits. Since WEP keys should always be specified in their hexadecimal form to guarantee device interaction, and since each hex digit represents 4 binary bits of the key, 40 and 104 bit keys are represented by 10 and 26 hex digits respectively. So you may simply snip off whatever length of random hex characters you require for your system's WEP key. Note that if all of your equipment supports the use of the new longer 256/232 bit WEP keys, you would use 232/4 or 58 hexadecimal characters for your pre-shared key. Since we have heard unconfirmed anecdotal reports of such non-compliant WPA devices (and since you might have one), this page also offers 'junior' WPA password strings using only the 'easy' ASCII characters which even any non-fully-specification-compliant device would have to be able to properly handle. If you find that using the full random ASCII character set within your WPA-PSK protected WiFi network causes one of your devices to be unable to connect to your WPA protected access point, you can downgrade your WPA network to 'easy ASCII' by using one of these easy keys. And don't worry for a moment about using an easy ASCII key. If you still use a full-length 63 character key, your entire network will still be EXTREMELY secure. And PLEASE drop us a line to let us know that you have such a device and what it is! When these passwords are used to generate pre-shared keys for protecting WPA WiFi and VPN networks, the only known attack is the use of 'brute force' — trying every possible password combination. Brute force attackers hope that the network's designer (you) were lazy and used a shorter password for 'convenience'. So they start by trying all one-character passwords, then two-character, then three and so on, working their way up toward longer random passwords. Note that while this 'the longer the better' rule of thumb is always true, long passwords won't protect legacy WEP-protected networks due to well known and readily exploited weaknesses in the WEP keying system and its misuse of WEP's RC4 encryption. With WEP protection, even a highly random maximum-entropy key can be cracked in a few hours. (Listen to Security Now! episode #11 for the full story on cracking WEP security.)
Select any number under the Default Transmit Key in order to determine which key you will use. In this example, we selected number 1.
Type a wireless network password of your choice, such as 'MySecretKey' and click Generate.Perfect Passwords
GRC's Ultra High Security
Password Generator2,571 sets of passwords generated per day
33,540,663 sets of passwords generated for our visitors
not simple. So here is some totally random raw
material, generated just for YOU, to start with.64 random hexadecimal characters (0-9 and A-F): 96A2A6FF2669EB6AC1DDF8F941EC94511E1217187A796D3FDBDB5263C13B77B1 63 random printable ASCII characters: LntIYlD{ybd/5QWORQa^N5;]/Q9v.cc{8`}'sadpZq-oE;s2*kp<UP{co:)cPs: 63 random alpha-numeric characters (a-z, A-Z, 0-9): JT83KLbxkVFxxMcDClfB5MwBRlijbrbIkYmXsftaiikWU2Nr44e6ZNMhsBktkzU Click your web browser's 'refresh' button a few times and watch the password strings change each time.
Every one is completely random (maximum entropy) without any pattern, and the cryptographically-strong pseudo random number generator we use guarantees that no similar strings will ever be produced again. 128 Bit Password Generator
Application Notes:
Throughout this page I use the shorthand term 'random' instead of the longer but more precise term 'pseudo-random'. I use the output of this page — myself — for any purpose, without hesitation, any time I need a chunk of randomness because there is no better place to find anything more trusted, random and safe. The 'pseudo-randomness' of these numbers does not make them any less good.
The raw password material is provided in several formats to support its use in many different applications. Each of the password strings on the page is generated independently of every other, based upon its own unique pseudo-random binary data. So there is no underlying similarity in the data among the various format passwords. 3E01A64A950CF0F8B736DEF8578CF99E6B18D1B261F26110AD0B535DE2A216C9 Each of the 64 hexadecimal characters encodes 4 bits of binary data, so the entire 64 characters is equivalent to 256 binary bits — which is the actual binary key length used by the WiFi WPA pre-shared key (PSK). Some WPA-PSK user interfaces (such as the one in Windows XP) allows the 256-bit WPA pre-shared key to be directly provided as 64 hexadecimal characters. This is a precise means for supplying the WPA keying material, but it is ONLY useful if ALL of the devices in a WPA-protected WiFi network allow the 256-bit keying material to be specified as raw hex. If any device did not support this mode of specification (and most do not) it would not be able to join the network.
If some of your WiFi network cannot support the newer and much stronger (effectively unbreakable when used with maximum-entropy keys like these) WPA encryption system, you'll be forced either to run two WiFi networks in parallel (which is totally feasible — one super-secure and one at lower security) or to downgrade your entire network to weaker WEP encryption. Still, ANY encryption is better than no encryption.
63 printable ASCII characters hashed down to 256 binary bits:lb-[11gP.q-P&{-B^)?]Ip%*]Imn7B_ma$9@g;akhH8AR@jLu3+yV&dOj1 e5FM The more 'standard' means for specifying the 256-bits of WPA keying material is for the user to specify a string of up to 63 printable ASCII characters. This string is then 'hashed' along with the network's SSID designation to form a cryptographically strong 256-bit result which is then used by all devices within the WPA-secured WiFi network. (The ASCII character set was updated to remove SPACE characters since a number of WPA devices were not handling spaces as they should.)
The 63 alphanumeric-only character subset:leKiF47mQ3Tzr51FwRUUtNDOEZp5yP93VEX4JAsWcSFzvulbC5mkliug77PDv6V If some device was not following the WiFi Alliance WPA specification by not hashing the entire printable ASCII character set correctly, it would end up with a different 256-bit hash result than devices that correctly obeyed the specification. It would then be unable to connect to any network that uses the full range of printable ASCII characters.
Shorter pieces are random too:
A beneficial property of these maximum entropy pseudo-random passwords is their lack of 'inter-symbol memory.' This means that in a string of symbols, any of the possible password symbols is equally likely to occur next. This is important if your application requires you to use shorter password strings. Any 'sub-string' of symbols will be just as random and high quality as any other.
When does size matter?
The use of these maximum-entropy passwords minimizes (essentially zeroes) the likelihood of successful 'dictionary attacks' since these passwords won't appear in any dictionary. So you should always try to use passwords like these. Since the passwords used to generate pre-shared keys are configured into the network only once, and do not need to be entered by their users every time, the best practice is to use the longest possible password and never worry about your password security again.
The Techie Details:
Since its introduction, this Perfect Passwords page has generated a great deal of interest. A number of people have wished to duplicate this page on their own sites, and others have wanted to know exactly how these super-strong and guaranteed-to-be-unique never repeating passwords are generated. The following diagram and discussion provides full disclosure of the pseudo-random number generating algorithm I employed to create the passwords on this page:
While the diagram above might at first seem a bit confusing, it is a common and well understood configuration of standard cryptographic elements. A succinct written description of the algorithm would read: 'Rijndael (AES) block encryption of never-repeating counter values in CBC mode.'
CBC stands for 'Cipher Block Chaining' and, as I describe in detail in the second half of Security Now! Episode #107, CBC provides necessary security in situations where some repetition or predictability of the 'plaintext' message is present. Since the 'plaintext' in this instance is a large 128-bit steadily-increasing (monotonic) counter value (which gives us our guaranteed never-to-repeat property, but is also extremely predictable) we need to scramble it so that the value being encrypted cannot be predicted. This is what 'CBC' does: As the diagram above shows, the output from the previous encryption operation is 'fed back' and XOR-mixed with the incrementing counter value. This prevents the possibility of determining the secret key by analysing successive counter encryption results.
One last detail: Since there is no 'output from the previous encryption' to be used during the encryption of the first block, the switch shown in the diagram above is used to supply a 128-bit 'Initialization Vector' (which is just 128-bits of secret random data) for the XOR-mixing of the first counter value. Thus, the first encryption is performed on a mixture of the 128-bit counter and the 'Initialization Vector' value, and subsequent encryptions are performed on the mixture of the incrementing counter and the previous encrypted result.
The result of the combination of the 256-bit Rijndael/AES secret key, the unknowable (therefore secret) present value of the 128-bit monotonically incrementing counter, and the 128-bit secret Initialization Vector (IV) is 512-bits of secret data providing extremely high security for the generation of this page's 'perfect passwords'. No one is going to figure out what passwords you have just received.
How much security do 512 binary bits provide? Well, 2^512 (2 raised to the power of 512) is the total number of possible combinations of those 512 binary bits — every single bit of which actively participates in determining this page's successive password sequence. 2^512 is approximately equal to: 1.34078079 x 10^154, which is this rather amazing number: 13, 407, 807, 929, 942, 597, 099, 574, 024, 998, 205,
846, 127, 479, 365, 820, 592, 393, 377, 723, 561, 443,
721, 764, 030, 073, 546, 976, 801, 874, 298, 166, 903,
427, 690, 031, 858, 186, 486, 050, 853, 753, 882, 811,
946, 569, 946, 433, 649, 060, 084, 096
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