Replace ugly tweak size computation with explicit tweak clean API.

[tfcrypt.git] / README

diff --git a/README b/README
index f26c3461c4d2fb4cd106c0181519bd8f910f7dd1..486307ef2d19eff9762b14da4baffbf90f6e5ab8 100644 (file)
--- a/README
+++ b/README
@@ -15,9 +15,9 @@ with Skein hash function. Default key length is 1280 bits (160 bytes).
 This program is incompatible with older, "tf1024" tfcrypt version. This version aims to
 provide a portable encryption tool to encrypt fixed media such as disks and archive files,
 as well as to provide decades long privacy for encrypted data. That's why it uses 1024 bit
 This program is incompatible with older, "tf1024" tfcrypt version. This version aims to
 provide a portable encryption tool to encrypt fixed media such as disks and archive files,
 as well as to provide decades long privacy for encrypted data. That's why it uses 1024 bit

-encryption and, unlike older version, extends key size to 1280 bits, eliminates tweak feature
-from Threefish and uses either XTS (by default) or OCB modes of operation instead,
-to encrypt fixed media in a secure undetectable way.
+encryption and, unlike older version, virtually extends key size to 1280 bits by
+removing tweak feature from Threefish and uses either XTS (by default) or OCB modes of
+operation instead, to encrypt fixed media in a secure undetectable way.

 
 Supported modes of operation: CTR, ECB, CBC, XTS, OCB and arbitrary long keystream.
 OCB mode does not use Skein hash function to hash and verify message, instead, it does
 
 Supported modes of operation: CTR, ECB, CBC, XTS, OCB and arbitrary long keystream.
 OCB mode does not use Skein hash function to hash and verify message, instead, it does


@@ -30,11 +30,7 @@ slow on 32 bit systems. This way, it cannot be efficiently used on pure 32 bit m
 
 Threefish contained here is stripped off of it's tweak property, thus, it is turned into a
 regular block cipher. To add tweakability, either XTS or OCB modes of operation are used.
 
 Threefish contained here is stripped off of it's tweak property, thus, it is turned into a
 regular block cipher. To add tweakability, either XTS or OCB modes of operation are used.

-Default wide block size is 4096 bytes. Author strongly believes that Threefish _may_ be subject
-to related key attacks when used in a tweaked mode, so this property is easy to remove.
-Because tweak occupied another 192 bits of key material, these 192 bits are added to effective
-key length. Another key word is extracted from the sum of all the user key words, thus,
-another 64 bits. Total +256 additional bits of key = 1280 key bits.
+Default wide block size is 4096 bytes.

 
 SKEIN NOTES
 
 
 SKEIN NOTES