Title: Secrets for Sharing

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If this weren't enough Internxt Send doesn't impose any file size limits, nor is there any restriction on what type of files you can send.

When Should You Share a Secret? | Psychology Today

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Encode the secret as a binary number s of any length. Give to each player i aside from the last a random binary number p i of the same length as s. Give to the last player the share calculated as p n = s ⊕ p 1 ⊕ p 2 ⊕ ... ⊕ p n−1, where ⊕ denotes bitwise exclusive or. The secret is the bitwise exclusive-or of all the players' numbers ( p i, for 1 ≤ i ≤ n). The "Direct Message" feature supports sending file attachments. There's a file size limit of 2GB but no restriction on the type of files that you can send. There's also no limit on the overall number of files sent. Blakley's scheme is less space-efficient than Shamir's; while Shamir's shares are each only as large as the original secret, Blakley's shares are t times larger, where t is the threshold number of players. Blakley's scheme can be tightened by adding restrictions on which planes are usable as shares. The resulting scheme is equivalent to Shamir's polynomial system.Common to all unconditionally secure secret sharing schemes, there are limitations: [ citation needed] Each share of the secret must be at least as large as the secret itself. This result is based in information theory, but can be understood intuitively. Given t − 1 shares, no information whatsoever can be determined about the secret. Thus, the final share must contain as much information as the secret itself. There is sometimes a workaround for this limitation by first compressing the secret before sharing it, but this is often not possible because many secrets (keys for example) look like high-quality random data and thus are hard to compress. Secret sharing also allows the distributor of the secret to trust a group 'in aggregate'. Traditionally, giving a secret to a group for safekeeping would require that the distributor completely trust all members of the group. Secret sharing schemes allow the distributor to securely store the secret with the group even if not all members can be trusted all the time. So long as the number of traitors is never more than the critical number needed to reconstruct the secret, the secret is safe. Anyone with access to Internxt's servers would only see encrypted information. Internxt is built on zero-knowledge architecture, guaranteeing to not scan or save any data you send through the service, although even if they did it wouldn't be much use since they wouldn't have access to your decryption keys.

Sharing Information for Safeguarding How to Guide: Sharing Information for Safeguarding

In one type of secret sharing scheme there is one dealer and n players. The dealer gives a share of the secret to the players, but only when specific conditions are fulfilled will the players be able to reconstruct the secret from their shares. The dealer accomplishes this by giving each player a share in such a way that any group of t (for threshold) or more players can together reconstruct the secret but no group of fewer than t players can. Such a system is called a ( t, n)-threshold scheme (sometimes it is written as an ( n, t)-threshold scheme). When space efficiency is not a concern, trivial t = n schemes can be used to reveal a secret to any desired subsets of the players simply by applying the scheme for each subset. For example, to reveal a secret s to any two of the three players Alice, Bob and Carol, create three ( ( 3 2 ) {\displaystyle {\binom {3}{2}}} ) different t = n = 2 secret shares for s, giving the three sets of two shares to Alice and Bob, Alice and Carol, and Bob and Carol. Find sources: "Secret sharing"– news · newspapers · books · scholar · JSTOR ( February 2019) ( Learn how and when to remove this template message) The messaging app has a fairly basic interface and there's no web alternative. Sadly there's also no Linux version available, although technically someone in the know could build their own version using the source code. SyncThing uses TLS to protect data in transit, which combined with the open BitTorrent protocol makes for ultra-secure communications. Another advantage of using TLS is that SyncThing can make use of digital certificates to authenticate devices, so only those you authorize can access your data.A secure secret sharing scheme distributes shares so that anyone with fewer than t shares has no more information about the secret than someone with 0 shares. The Chinese remainder theorem can also be used in secret sharing, for it provides us with a method to uniquely determine a number S modulo k many pairwise coprime integers m 1 , m 2 , . . . , m k {\displaystyle m_{1},m_{2},...,m_{k}} , given that S < ∏ i = 1 k m i {\displaystyle S<\prod _{i=1} Besides the industry-leading encryption on offer here, the app itself is fairly plain and basic in terms of visuals and appearance. It does support group chats though, as well as the sending of files and photos in addition to text, so you're going to be pretty well covered no matter what your needs.