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Make service IDs 80 bits, not 128

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svn:r1393
This commit is contained in:
Nick Mathewson 2004-03-30 19:20:11 +00:00
parent 3714b123f0
commit 112871b618
1 changed files with 3 additions and 4 deletions
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rend-spec.txt
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@ -171,16 +171,15 @@ Tor Rendezvous Spec
~16-octet hash of Bob's service's public key, computed as follows:
1. Let H = H(PK).
2. Let H' = the first 130 bits of H, considering each octet from
2. Let H' = the first 80 bits of H, considering each octet from
most significant bit to least significant big.
2. Generate a 26-character encoding of H', taking H' 5 bits at
a time, and mapping each 5-bit value to a character as follows:
0..25 map to the characters 'a'...'z', respectively.
26..31 map to the characters '0'...'5', respectively.
(We only use 130 bits instead of the 160 bits from SHA1 because we don't
need to worry about man-in-the-middle attacks. We use 130 instead of 128
in order to have an even multiple of 5.)
(We only use 80 bits instead of the 160 bits from SHA1 because we don't
need to worry about man-in-the-middle attacks.)
[Yes, numbers are allowed at the beginning. See RFC1123. -NM]