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12 sty 2013 · For PBKDF2, you can specify the length of the derived key. For scrypt, you can pick the first N bits of the output and use them as the key. The most straightforward way of doing this without using a KDF is to concatenate your passphrase with a 24 bit IV (initialization vector) and form an RC4 key.
Encryption: WEP uses the RC4 stream cipher for encryption. The standard supported key sizes of 64-bit and 128-bit, but in practice, these are actually 40-bit and 104-bit keys respectively, with the remaining bits used for an Initialization Vector (IV).
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-bit IV = 128-bit WEP key).
If you are using Windows Network and Sharing Center to setup wireless network, by default Windows selects 64 bit Wired Equivalent Privacy(WEP). If you are already connected to the network, disconnect from the Network and try to reconnect and check if you get an option to select 128 bit encryption.
The higher level of WEP encryption, commonly referred to as 128 bit WEP, actually uses a 104 bit (26 Hex character) “secret key” (set by the user), and a 24 bit “Initialization Vector” (not under user control).
29 cze 2022 · For 64-bit encryption - You can enter 10 hexadecimal digits (any combination of 0-9, a-f, A-F, zero key is not permitted) or 5 ASCII characters. For 128-bit encryption - You can enter 26 hexadecimal digits (any combination of 0-9, a-f, A-F, zero key is not permitted) or 13 ASCII characters.
When WEP encryption is enabled, there are up to four options*:64-bit and 128-bit. 64-bit is the same as 40-bit WEP. The lowerlevel of WEP encryption uses a 40-bit (10 character) "secret key" (set by the user), and a 24-bit "initialization vector" (not underuser control).
