Examples
- PGP is generally considered an example of strong cryptography, with versions running under most popular operating systems and on various hardware platforms. The open source standard for PGP operations is OpenPGP, and GnuPG is an implementation of that standard from the FSF.
- The AES algorithm is considered strong after being selected in a lengthy selection process that was open and involved numerous tests.
Examples that are not considered cryptographically strong include:
- The DES, whose 56-bit keys allow attacks via exhaustive search.
- Wired Equivalent Privacy which is subject to a number of attacks due to flaws in its design.
- The Clipper Chip, a failed initiative of the U.S. government that included key escrow provisions, allowing the government to gain access to the keys.
- Almost all classical ciphers.
The SSL protocol, used to secure Internet transactions, is generally considered strong, but an early "international" version, with a 40-bit effective key to allow export under pre-1996 U.S. regulations, was not.
Read more about this topic: Strong Cryptography
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