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zzz
2020-04-28 20:52:12 +00:00
parent 0a81c6d360
commit 8d6a79cac5
2 changed files with 16 additions and 5 deletions
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12
i2p2www/pages/site/docs/how/elgamal-aes.html
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@@ -1,7 +1,7 @@
{% extends "global/layout.html" %} {% extends "global/layout.html" %}
{% block title %}{% trans %}ElGamal/AES + SessionTag Encryption{% endtrans %}{% endblock %} {% block title %}{% trans %}ElGamal/AES + SessionTag Encryption{% endtrans %}{% endblock %}
{% block lastupdated %}{% trans %}January 2016{% endtrans %}{% endblock %} {% block lastupdated %}April 2020{% endblock %}
{% block accuratefor %}0.9.24{% endblock %} {% block accuratefor %}0.9.46{% endblock %}
{% block content %} {% block content %}
<h2>{% trans %}Overview{% endtrans %}</h2> <h2>{% trans %}Overview{% endtrans %}</h2>
<p>{% trans -%} <p>{% trans -%}
@@ -342,6 +342,14 @@ See the <a href="{{ i2cpspec }}#msg_SendMessageExpires">I2CP Send Message Expire
<h2 id="future">{% trans %}Future Work{% endtrans %}</h2> <h2 id="future">{% trans %}Future Work{% endtrans %}</h2>
<p><b>Note:</b>
ElGamal/AES+SessionTags is being replaced with ECIES-X25519-AEAD-Ratchet (Proposal 144).
The issues and ideas referenced below have been incorporated
into the design of the new protocol.
The following items will not be addressed in ElGamal/AES+SessionTags.
</p>
<p>{% trans -%} <p>{% trans -%}
There are many possible areas to tune the Session Key Manager's algorithms; There are many possible areas to tune the Session Key Manager's algorithms;
some may interact with the streaming library behavior, or have significant some may interact with the streaming library behavior, or have significant

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i2p2www/spec/proposals/144-ecies-x25519-aead-ratchet.rst
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@@ -5,7 +5,7 @@ ECIES-X25519-AEAD-Ratchet
:author: zzz, chisana, orignal :author: zzz, chisana, orignal
:created: 2018-11-22 :created: 2018-11-22
:thread: http://zzz.i2p/topics/2639 :thread: http://zzz.i2p/topics/2639
:lastupdated: 2020-04-27 :lastupdated: 2020-04-28
:status: Open :status: Open
:target: 0.9.46 :target: 0.9.46
:implementedin: 0.9.46 :implementedin: 0.9.46
@@ -3512,11 +3512,14 @@ Storage
The sender generates tags and keys on the fly, so there is no storage. The sender generates tags and keys on the fly, so there is no storage.
This cuts overall storage requirements in half compared to ElGamal/AES. This cuts overall storage requirements in half compared to ElGamal/AES.
ECIES tags are 8 bytes instead of 32 for ElGamal/AES. ECIES tags are 8 bytes instead of 32 for ElGamal/AES.
This cuts overall storage requiremens by another factor of 4. This cuts overall storage requirements by another factor of 4.
Per-tag session keys are not stored at the receiver except for "gaps", Per-tag session keys are not stored at the receiver except for "gaps",
which are minimal for reasonable loss rates. which are minimal for reasonable loss rates.
Therefore, the total space savings vs. ElGamal/AES is a factor of 8, or 87%. The 33% reduction in tag expiration time creates another 33% savings,
assuming short session times.
Therefore, the total space savings vs. ElGamal/AES is a factor of 10.7, or 92%.