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Diffstat (limited to 'src')
| -rw-r--r-- | src/ht.erl | 22 |
1 files changed, 22 insertions, 0 deletions
@@ -1,3 +1,25 @@ +%%% +%%% Implementation of a history tree similar to what is described in +%%% Efficient Data Structures for Tamper-Evident Logging [0]. This +%%% implementation follows RFC 6962 and differs from [0] only in how +%%% non-full trees are handled. +%%% +%%% Useful terminology: +%%% C -- Commitment. +%%% X -- Event, stored in leaf nodes. +%%% I(i,r) -- Interior node with index i, on layer r. +%%% A(v)(i,r) -- Hash of I(i,r) in tree of version v. +%%% d -- Depth of tree. +%%% +%%% Nodes are identified by their index i and layer r. +%%% I(i,r) has left child I(i,r-1) and right child I(i+2^(r-1),r-1). +%%% +%%% A version-n tree stores n+1 events. +%%% In a version-n tree, I(i,r) is frozen when n >= i + 2^r - 1. +%%% +%%% [0] https://www.usenix.org/event/sec09/tech/full_papers/crosby.pdf +%%% + -module('ht'). -include_lib("eunit/include/eunit.hrl"). |