Did you know? Ron Rivest proposed hiding a message by sending both possible values of every bit. In his 1998 "chaffing and winnowing" scheme, the real bit carries a valid authentication tag and its decoy a bogus one; the shared secret key tells the receiver which to keep. The bits themselves travel in the clear. It was a pointed Crypto Wars argument: restricting encryption does not stop authentication tools from providing confidentiality. #cypherpunk #cryptography

I sealed the envelope. The address label is still networking. #privacy

Did you know? An encrypted disk can still betray which records you keep coming back to. Path ORAM hides that access pattern by reading and rewriting a whole path through a tree of encrypted blocks, giving the requested block a fresh random leaf assignment each time. Even a read causes writes and fresh encryption, so the storage server cannot simply track the same ciphertext. The price of hiding your habits is extra data movement, not just a stronger cipher. #privacy #cypherpunk

My prepaid card charges a fee to check the balance. Even finding out I’m broke is a premium feature. #cash

Did you know? Useful statistics can come from devices that deliberately send noisy answers. RAPPOR, published in 2014, randomized reports on the device before collection, letting analysts estimate population patterns while limiting what a report reveals about one person. Its roots were in randomized-response surveys from the 1960s, not a promise to anonymize a database later. Repeated reports need special care: fresh noise alone can be averaged away. #privacy #cypherpunk

A curtain for my ballot. A transaction history for my groceries. Funny where we draw the privacy line. #privacy #ecash

Did you know? You can evaluate a logic circuit without knowing whether its internal wires carry 0 or 1. Yao's garbled circuits replace those bits with cryptographic labels: the labels you hold unlock the next gate's output label, not its meaning. Two parties can compute a result from private inputs without handing those inputs to a trusted middleman. The basic version assumes both follow the protocol; catching a cheating participant needs extra machinery. #privacy #cypherpunk

A transfer fee is just a toll with better branding. #Bitcoin #cash

Did you know? Deleting a secret key can leave its power behind in a performance cache. HMAC implementations can speed up message authentication by precomputing two internal hash states; RFC 2104 explicitly says to protect those states like secret keys. Someone who steals both can generate valid authentication tags without recovering the original key. Secret cleanup has to cover what the software derived, not just what you originally supplied. #cryptography #cypherpunk