31 may 2011
4 may 2011
IDEA, RC2 Y RC4
International Data Encryption Algorithm (IDEA), RC2 and RC4
IDEA is similar to DES. It is patented internationally and so can be used in software outside of the US to its full 128-bit key length. It is believed to be a strong algorithm and no practical attacks on it have been published.
Netscape's Secure Socket Layer (SSL) implements DES, RSA, RC4 and IDEA. as part of its encryption algorithm.
RC2 and RC4
RC2 and RC4 are variable key size symmetric cipher functions. They were designed for bulk encryption and are faster than most other symmetric functions such as DES. RC2 is a variable length key symmetric block cipher. It can serve as a replacement for DES and is about twice as fast. RC4 is a variable length key symmetric stream cipher - it is at least 10 times as fast as DES in software. Because both RC2 and RC4 can have variable length keys, they can be as secure or insecure as is required or allowed.
RC2 and RC4 have special status with regard to export approval from the US. They are granted export approval quicker than other encryption software however they must limit their key lengths to 40 bits. It is this 40-bit RC4 algorithm that is used in many international versions of software such as Netscape Navigator. The algorithm for RC4 was a trade secret until it was published in a Usenet newsgroup. As it wasn't actually copyrighted it has been implemented outside of the US and is used in various softwares such as the free implementation of Netscape's Secure Socket Layer.
IDEA is similar to DES. It is patented internationally and so can be used in software outside of the US to its full 128-bit key length. It is believed to be a strong algorithm and no practical attacks on it have been published.
Netscape's Secure Socket Layer (SSL) implements DES, RSA, RC4 and IDEA. as part of its encryption algorithm.
RC2 and RC4
RC2 and RC4 are variable key size symmetric cipher functions. They were designed for bulk encryption and are faster than most other symmetric functions such as DES. RC2 is a variable length key symmetric block cipher. It can serve as a replacement for DES and is about twice as fast. RC4 is a variable length key symmetric stream cipher - it is at least 10 times as fast as DES in software. Because both RC2 and RC4 can have variable length keys, they can be as secure or insecure as is required or allowed.
RC2 and RC4 have special status with regard to export approval from the US. They are granted export approval quicker than other encryption software however they must limit their key lengths to 40 bits. It is this 40-bit RC4 algorithm that is used in many international versions of software such as Netscape Navigator. The algorithm for RC4 was a trade secret until it was published in a Usenet newsgroup. As it wasn't actually copyrighted it has been implemented outside of the US and is used in various softwares such as the free implementation of Netscape's Secure Socket Layer.
3 may 2011
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