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Re: [Taler] what's a general security parameter

From: Christian Grothoff
Subject: Re: [Taler] what's a general security parameter
Date: Thu, 11 Aug 2022 14:26:32 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0

It is a parameter you can (more or less) freely raise to increase the security of the system while decreasing performance. Ideally, the increase in security is exponential in the security parameter, while the corresponding performance degradation is polynomial or linear.

Examples: RSA 1024 vs. RSA 2048 vs. RSA 4096. Here, the security parameter is the number of bits, so 1024, 2048 or 4096. Same for SHA-256 or SHA-512.

On 8/11/22 13:46, Calvin Burns via Taler wrote:
In Zero-Knowledge Age Restriction for GNU Taler [1] λ is a "general security
parameter". What is a general security parameter?  Could someone please
point at text books/literature explaining it?  Thanks.

[1] https://taler.net/en/news/2022-09.html

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