security_abriviations.md

Goal

• IND - indistinguishibility - to distinguish ciphertexts of two messages
• OWF - onewaysness - to decrypt a message
• EUF - (weak) existencial unforgeability - to find a new valid pair (m,s) s.t. m was not send to sign oracle
• SUF - strong existential unforgeability - to find a new valid pair (m,s) s.t. (m,s) was not output by sign oracle

Oraculum

• PASS - nothing
• CPA - encryption
• CCA - decryption except a target message
• CMA - chosen message attack - gives a signatre of a message

Block Cipher Modes

• EBC - electronic codebook
• CBC - ciphertext chaining - natural option
• CTR - counter mode
• GCM - galois counter mode
• OFB - output feedback - stream cipher
• XEX,XTS - drives
• OCB - offset codebook mode - input & output masks, one-round AEAD
• CFB - cipher feedback - =OFB but xoring plaintext additionally

Hard problems

• DDH - distinguishing Diffie-Helman
• CDH - computational Diffie-Helman
• DL - discrete logarithm
• RSA

Schemes

• MPC - multiparty computation
• FE - functional encryption
• FHE - fully homomorphic encryption
• SFHE - somewhat homomorphic encryption
• KEM - key encaptulation mechanism
• DEM - data encaptulation mechanism
• FDH - full domain hash - hash and sign based signature

Others

• OAEP - E(m) = f_{pk}({m|0^t⊕G(R)}||{R⊕H(m|0^t⊕G(R) )})