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Triple DES
Triple DES

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!!! Overview
[{$pagename}] (or [TDES] or [DES3]) is a variation of the Data Encryption Standard ([DES]) [Symmetric Key] [Cipher] that is three times slower than [DES] but provides stronger reliability.
The [Cipher] uses three 64-bit keys for a combined key length of 192 bits.
The [Message] is encrypted with the first key, decrypted with the second key, and then re-encrypted with the third key.
You [MUST] ensure that all three keys, are unique.
%%warning
[National Institute of Standards and Technology] ([NIST]) has announced withdrawal of approval for [{$pagename}] (also known as [3DES], [TDES] and sometimes DES EDE) in common [protocols] such as [TLS] and [IPsec].
%%
[{$pagename}] [cipher] suffers from a fundamental [weakness|Cryptographically Weak] linked to its small (64-bit) blocksize, i.e. the size of [plaintext] that it can encrypt. In the common mode of operation [CBC], each plaintext block is [Bitwise XOR]ed with the previous [ciphertext] before [encryption]. This means if you encrypt a lot of [data] and by chance you and get the same [ciphertext] block [twice|Cryptographic Collision], an [attacker] can learn the [Bitwise XOR] of the two corresponding blocks of [plaintext] (he obtains this by [Bitwise XOR]ing the two preceding [ciphertexts] together).
How much [plaintext] do you need to [encrypt] before a collision becomes likely? The calculation is closely related to the [Birthday Paradox].
[{$pagename}] suffers from the same [cryptographically Weak] issue as similar to [MD5]
!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
This page (revision-1) was last changed on 29-Nov-2024 16:16 by UnknownAuthorTop