rbrunner7 made a systematic review of Monero wallet apps to see whether they support Polyseed, and if so, to what degree, with special attention to encrypted Polyseeds.
Polyseed support (including encryption and seed offsets) falls into these groups:
A) No Polyseed support at all. Example: official Monero GUI wallet
B) Basic Polyseed support only, without encryption or seed offsets. Example: Skylight Wallet 1.0.8
C) Polyseed + seed offsets, but no encryption. Example: Feather Wallet
D) Full support (Polyseed + seed offsets + encryption). Sole example so far: Cake Wallet
Note: Monero’s legacy word list has 1,626 words. The new Polyseed uses the BIP-39 word list (2048 words) instead.
I wrote about seed words here: 
GitHub
Seed encryption and plausible deniability · Issue #13 · tevador/polyseed
The seed encryption feature currently sets a bit flag in the mnemonic phrase that marks the phrase as being encrypted. This is done for UX reasons ...
I wrote about seed words here: 
Monero vs. Bitcoin BIP 39 Seed Words
Friday Fun Facts for Monero Fans: An Answer to the XMRChat Question

imo, "The first free national pager" was pinprick cipher in UK after 1840 )))
"A dot or pinprick concealment cipher is a common classical encryption method in which dot or pinprick is placed above or below certain letters in a piece of writing...
...Victorians used the pinprick trick too, not for spies but to dodge high postage fees (rates varied but often around a shilling per hundred miles or so for a letter before the 1840 Penny Post reforms). Newspapers mailed free, so they’d pinprick messages on the front page and send those instead of letters."
I wrote abt it here: 
Read this thread 👇





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