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+Newsgroups: sci.crypt,alt.security,comp.security.misc,alt.privacy
+Path: ghost.dsi.unimi.it!univ-lyon1.fr!jussieu.fr!zaphod.crihan.fr!warwick!clyde.open.ac.uk!strath-cs!bnr.co.uk!bt!pipex!howland.reston.ans.net!europa.eng.gtefsd.com!MathWorks.Com!yeshua.marcam.com!charnel.ecst.csuchico.edu!csusac!csus.edu!netcom.com!sterndark
+From: sterndark@netcom.com (David Sterndark)
+Subject: RC4 Algorithm revealed.
+Message-ID: <sternCvKL4B.Hyy@netcom.com>
+Sender: sterndark@netcom.com 
+Organization: NETCOM On-line Communication Services (408 261-4700 guest)
+X-Newsreader: TIN [version 1.2 PL1]
+Date: Wed, 14 Sep 1994 06:35:31 GMT
+Lines: 263
+Xref: ghost.dsi.unimi.it sci.crypt:27332 alt.security:14732 comp.security.misc:11701 alt.privacy:16026
+
+I am shocked,  shocked, I tell you,  shocked, to discover
+that the cypherpunks have illegaly and criminally revealed
+a crucial RSA trade secret and harmed the security of
+America by reverse engineering the RC4 algorithm and
+publishing it to the world.
+ 
+On Saturday morning an anonymous cypherpunk wrote:
+ 
+ 
+   SUBJECT:  RC4 Source Code
+ 
+ 
+   I've tested this.  It is compatible with the RC4 object module
+   that comes in the various RSA toolkits.  
+ 
+   /* rc4.h */
+   typedef struct rc4_key
+   {      
+        unsigned char state[256];       
+        unsigned char x;        
+        unsigned char y;
+   } rc4_key;
+   void prepare_key(unsigned char *key_data_ptr,int key_data_len,
+   rc4_key *key);
+   void rc4(unsigned char *buffer_ptr,int buffer_len,rc4_key * key);
+   
+   
+   /*rc4.c */
+   #include "rc4.h"
+   static void swap_byte(unsigned char *a, unsigned char *b);
+   void prepare_key(unsigned char *key_data_ptr, int key_data_len,
+   rc4_key *key)
+   {
+        unsigned char swapByte;
+        unsigned char index1;
+        unsigned char index2;
+        unsigned char* state;
+        short counter;     
+        
+        state = &key->state[0];         
+        for(counter = 0; counter < 256; counter++)              
+        state[counter] = counter;               
+        key->x = 0;     
+        key->y = 0;     
+        index1 = 0;     
+        index2 = 0;             
+        for(counter = 0; counter < 256; counter++)      
+        {               
+             index2 = (key_data_ptr[index1] + state[counter] +
+                index2) % 256;                
+             swap_byte(&state[counter], &state[index2]);            
+   
+             index1 = (index1 + 1) % key_data_len;  
+        }       
+    }
+    
+    void rc4(unsigned char *buffer_ptr, int buffer_len, rc4_key *key)
+    { 
+        unsigned char x;
+        unsigned char y;
+        unsigned char* state;
+        unsigned char xorIndex;
+        short counter;              
+        
+        x = key->x;     
+        y = key->y;     
+        
+        state = &key->state[0];         
+        for(counter = 0; counter < buffer_len; counter ++)      
+        {               
+             x = (x + 1) % 256;                      
+             y = (state[x] + y) % 256;               
+             swap_byte(&state[x], &state[y]);                        
+                  
+             xorIndex = (state[x] + state[y]) % 256;                 
+                  
+             buffer_ptr[counter] ^= state[xorIndex];         
+         }               
+         key->x = x;     
+         key->y = y;
+    }
+    
+    static void swap_byte(unsigned char *a, unsigned char *b)
+    {
+        unsigned char swapByte; 
+        
+        swapByte = *a; 
+        *a = *b;      
+        *b = swapByte;
+    }
+ 
+ 
+ 
+Another cypherpunk, this one not anonymous, tested the
+output from this algorithm against the output from
+official RC4 object code
+ 
+ 
+   Date: Tue, 13 Sep 94 18:37:56 PDT
+   From: ekr@eit.COM (Eric Rescorla)
+   Message-Id: <9409140137.AA17743@eitech.eit.com>
+   Subject: RC4 compatibility testing
+   Cc: cypherpunks@toad.com
+   
+   One data point:
+   
+   I can't say anything about the internals of RC4 versus the
+   algorithm that Bill Sommerfeld is rightly calling 'Alleged RC4',
+   since I don't know anything about RC4's internals. 
+   
+   However, I do have a (legitimately acquired) copy of BSAFE2 and
+   so I'm able to compare the output of this algorithm to the output
+   of genuine RC4 as found in BSAFE. I chose a set of test vectors
+   and ran them through both algorithms. The algorithms appear to
+   give identical results, at least with these key/plaintext pairs.
+   
+   I note that this is the algorithm _without_ Hal Finney's
+   proposed modification
+   
+   (see <199409130605.XAA24133@jobe.shell.portal.com>).
+   
+   The vectors I used (together with the ciphertext they produce)
+   follow at the end of this message.
+   
+   -Ekr
+   
+   Disclaimer: This posting does not reflect the opinions of EIT.
+   
+   --------------------results follow--------------
+   Test vector 0
+   Key: 0x01 0x23 0x45 0x67 0x89 0xab 0xcd 0xef 
+   Input: 0x01 0x23 0x45 0x67 0x89 0xab 0xcd 0xef 
+   0 Output: 0x75 0xb7 0x87 0x80 0x99 0xe0 0xc5 0x96 
+   
+   Test vector 1
+   Key: 0x01 0x23 0x45 0x67 0x89 0xab 0xcd 0xef 
+   Input: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
+   0 Output: 0x74 0x94 0xc2 0xe7 0x10 0x4b 0x08 0x79 
+   
+   Test vector 2
+   Key: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
+   Input: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
+   0 Output: 0xde 0x18 0x89 0x41 0xa3 0x37 0x5d 0x3a 
+   
+   Test vector 3
+   Key: 0xef 0x01 0x23 0x45 
+   Input: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
+   0 Output: 0xd6 0xa1 0x41 0xa7 0xec 0x3c 0x38 0xdf 0xbd 0x61 
+   
+   Test vector 4
+   Key: 0x01 0x23 0x45 0x67 0x89 0xab 0xcd 0xef 
+   Input: 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 
+   0x01 
+   0 Output: 0x75 0x95 0xc3 0xe6 0x11 0x4a 0x09 0x78 0x0c 0x4a 0xd4 
+   0x52 0x33 0x8e 0x1f 0xfd 0x9a 0x1b 0xe9 0x49 0x8f 
+   0x81 0x3d 0x76 0x53 0x34 0x49 0xb6 0x77 0x8d 0xca 
+   0xd8 0xc7 0x8a 0x8d 0x2b 0xa9 0xac 0x66 0x08 0x5d 
+   0x0e 0x53 0xd5 0x9c 0x26 0xc2 0xd1 0xc4 0x90 0xc1 
+   0xeb 0xbe 0x0c 0xe6 0x6d 0x1b 0x6b 0x1b 0x13 0xb6 
+   0xb9 0x19 0xb8 0x47 0xc2 0x5a 0x91 0x44 0x7a 0x95 
+   0xe7 0x5e 0x4e 0xf1 0x67 0x79 0xcd 0xe8 0xbf 0x0a 
+   0x95 0x85 0x0e 0x32 0xaf 0x96 0x89 0x44 0x4f 0xd3 
+   0x77 0x10 0x8f 0x98 0xfd 0xcb 0xd4 0xe7 0x26 0x56 
+   0x75 0x00 0x99 0x0b 0xcc 0x7e 0x0c 0xa3 0xc4 0xaa 
+   0xa3 0x04 0xa3 0x87 0xd2 0x0f 0x3b 0x8f 0xbb 0xcd 
+   0x42 0xa1 0xbd 0x31 0x1d 0x7a 0x43 0x03 0xdd 0xa5 
+   0xab 0x07 0x88 0x96 0xae 0x80 0xc1 0x8b 0x0a 0xf6 
+   0x6d 0xff 0x31 0x96 0x16 0xeb 0x78 0x4e 0x49 0x5a 
+   0xd2 0xce 0x90 0xd7 0xf7 0x72 0xa8 0x17 0x47 0xb6 
+   0x5f 0x62 0x09 0x3b 0x1e 0x0d 0xb9 0xe5 0xba 0x53 
+   0x2f 0xaf 0xec 0x47 0x50 0x83 0x23 0xe6 0x71 0x32 
+   0x7d 0xf9 0x44 0x44 0x32 0xcb 0x73 0x67 0xce 0xc8 
+   0x2f 0x5d 0x44 0xc0 0xd0 0x0b 0x67 0xd6 0x50 0xa0 
+   0x75 0xcd 0x4b 0x70 0xde 0xdd 0x77 0xeb 0x9b 0x10 
+   0x23 0x1b 0x6b 0x5b 0x74 0x13 0x47 0x39 0x6d 0x62 
+   0x89 0x74 0x21 0xd4 0x3d 0xf9 0xb4 0x2e 0x44 0x6e 
+   0x35 0x8e 0x9c 0x11 0xa9 0xb2 0x18 0x4e 0xcb 0xef 
+   0x0c 0xd8 0xe7 0xa8 0x77 0xef 0x96 0x8f 0x13 0x90 
+   0xec 0x9b 0x3d 0x35 0xa5 0x58 0x5c 0xb0 0x09 0x29 
+   0x0e 0x2f 0xcd 0xe7 0xb5 0xec 0x66 0xd9 0x08 0x4b 
+   0xe4 0x40 0x55 0xa6 0x19 0xd9 0xdd 0x7f 0xc3 0x16 
+   0x6f 0x94 0x87 0xf7 0xcb 0x27 0x29 0x12 0x42 0x64 
+   0x45 0x99 0x85 0x14 0xc1 0x5d 0x53 0xa1 0x8c 0x86 
+   0x4c 0xe3 0xa2 0xb7 0x55 0x57 0x93 0x98 0x81 0x26 
+   0x52 0x0e 0xac 0xf2 0xe3 0x06 0x6e 0x23 0x0c 0x91 
+   0xbe 0xe4 0xdd 0x53 0x04 0xf5 0xfd 0x04 0x05 0xb3 
+   0x5b 0xd9 0x9c 0x73 0x13 0x5d 0x3d 0x9b 0xc3 0x35 
+   0xee 0x04 0x9e 0xf6 0x9b 0x38 0x67 0xbf 0x2d 0x7b 
+   0xd1 0xea 0xa5 0x95 0xd8 0xbf 0xc0 0x06 0x6f 0xf8 
+   0xd3 0x15 0x09 0xeb 0x0c 0x6c 0xaa 0x00 0x6c 0x80 
+   0x7a 0x62 0x3e 0xf8 0x4c 0x3d 0x33 0xc1 0x95 0xd2 
+   0x3e 0xe3 0x20 0xc4 0x0d 0xe0 0x55 0x81 0x57 0xc8 
+   0x22 0xd4 0xb8 0xc5 0x69 0xd8 0x49 0xae 0xd5 0x9d 
+   0x4e 0x0f 0xd7 0xf3 0x79 0x58 0x6b 0x4b 0x7f 0xf6 
+   0x84 0xed 0x6a 0x18 0x9f 0x74 0x86 0xd4 0x9b 0x9c 
+   0x4b 0xad 0x9b 0xa2 0x4b 0x96 0xab 0xf9 0x24 0x37 
+   0x2c 0x8a 0x8f 0xff 0xb1 0x0d 0x55 0x35 0x49 0x00 
+   0xa7 0x7a 0x3d 0xb5 0xf2 0x05 0xe1 0xb9 0x9f 0xcd 
+   0x86 0x60 0x86 0x3a 0x15 0x9a 0xd4 0xab 0xe4 0x0f 
+   0xa4 0x89 0x34 0x16 0x3d 0xdd 0xe5 0x42 0xa6 0x58 
+   0x55 0x40 0xfd 0x68 0x3c 0xbf 0xd8 0xc0 0x0f 0x12 
+   0x12 0x9a 0x28 0x4d 0xea 0xcc 0x4c 0xde 0xfe 0x58 
+   0xbe 0x71 0x37 0x54 0x1c 0x04 0x71 0x26 0xc8 0xd4 
+   0x9e 0x27 0x55 0xab 0x18 0x1a 0xb7 0xe9 0x40 0xb0 
+   0xc0 
+   
+
+
+-- 
+ ---------------------------------------------------------------------
+We have the right to defend ourselves and our
+property, because of the kind of animals that we              James A. Donald
+are.  True law derives from this right, not from
+the arbitrary power of the omnipotent state.                jamesd@netcom.com
+
+